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SEPTEMBER 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

SEPTEMBER 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer

September 2019 was much drier and much warmer than normal. It was the
warmest September I have had at my new location (back to 2017 only) and
my driest month ever (one again only going back to January 2017) My max
temp (82.0°) was 4.9° above normal but my min temp (64.2°) was even
more significantly 7.1° above normal, resulting in the mean temperature
(73.1°) to be 6.0° above normal. My total precipitation of 0.59″ was
3.44” below the normal September value for my station of 4.03”. There
were well below normal 3 days with measurable precipitation, widely
scattered through the month.

There were no notable relatively cool periods (max temps below 80°) during
the month, only totaling 12 days during the entire month. Conversely, there
were 2 two-day short hot periods during the month on the 11th and 12th
and later on the 22nd and 23rd when I had 4 of the 5 days of max temps
over 90 for the month, including the month’s hottest reading of 94.2° on
the 11th.

The monthly maximum daily precipitation of a meager 0.39″ during the
month’s only thunderstorm on the 2nd was the only somewhat wet
day of the month. Conversely there were two notably significant dry
periods during September when no rain fell (10 straight days from the
3rd-12th and 12 straight days from the 14th – 25th). With the very
dry month, these long, dry, generally warm periods did start showing
adverse effects on the vegetation in the immediate area, as we
officially were placed into a moderate drought status towards month’s
end.

The highest barometric pressure reading of the month of only 30.39”
occurred on the 13th during one of our brief cool spells during the
month. The lowest readings were a modest 29.77” on the 6th and 26th
during relatively cool spells during the month.

The highest dew point temperature reached during the month was 75°
on the 4th. There were 8 days in September when dew point temps
were 70° or higher, mostly during the first half of the month, The
lowest dew point temperature value was reached on the 19th when a
value of 36° was reached during our coolest period of the month,
when a 50.2° minimum temp was reached on the morning of the 20th,
coldest reading of the month. There were only 4 days during the month
when the dew point temps were below 50°, all during a generally cool
period between the 19th and 25th.

August had 8 cloudy days, 17 partly cloudy days, and 5 clear/sunny
days with once again an unusual higher amount of partly cloudy days
due to plenty of mid and high-level moisture that rarely ever reached
the ground unfortunately. There were 2 heating degree days and 244
cooling degree days during the month. There were 4 foggy days,
1 windy day, and 1 day with thunder.

Once again daily max/min temperatures didn’t vary very much, still a
typical trend during the late summer period. My maximum temperature
frequencies included 5 days over 90°, 13 days between 80° and 89°,
and 12 days between 70° and 79°. On the minimum temperature
frequency side of things, there were 6 days below 60°, 20 days
between 60° and 69° and 4 days 70° and above. The coldest daily
max temperature was 71.7° on the cloudy, light rainy 30th while the
warmest daily min temp of 72.5° was on the 12th, during the hottest
2 day spell of the month.

The diurnal range daily monthly average was 17.8° (- 2.2°). Our
greatest daily range of temperature was 28.3° on the 21st (87.8°-
59.5°). We had a total of 10 days with daily ranges above 20°. Our
lowest range of temperature was 5.9° (71.7°-65.8°) on the 30th
(our coolest max temperature day of the month). There were only
3 total days with diurnal temperature ranges of less than 10°
throughout the month, two of which occurred on two of the three
measurable precipitation days.

September 2019 was an atypical end of summer month for this
year, which had at least been running wet. The overall warmth
continues as part of our global warming phase. The thunderstorm
on the 2nd was loosely tied in with monster hurricane Dorian.
Other tropical activity during the month went elsewhere generally.
An instrumentation problem surfaced during September, as signals
from a newly installed VP2 across the street at the University of
Shady Grove (USG) started interfering with my station signals.
The initial key to this happening was getting wind data, which is
not possible from my station as I don’t have a working anemometer.
So the wind data is coming from the 60 foot high station on the
roof of the building across the street. During a particularly windy
period very recently, I got wildly inaccurate, very high rainfall
readings from it, as the wind shook the anemometer and tipped
the spoons way too often. Marty and I will be working on that in
the coming weeks. Rooftop vs ground data generally is not as
accurate, save for pure wind data.

SEPTEMBER 2019 – ROCKVILLE 2.8 WNW MARYLAND
SUMMARY STATISTICS

Average high temperature 82.0° (+ 4.9°)
Average low temperature 64.2° (+ 7.1°)
Mean temperature 73.1° (+ 6.0°)

Precipitation 0.59″ (- 3.44“)
Greatest daily amount (date) 0.39″ (2)
Greatest storm total (dates) 0.39” (2)
2019 year-to-date precipitation total 38.25″ (+ 7.52”)

High temperature for the month (date) 94.2° (11)
Low temperature for the month (date) 50.2° (20)

Highest barometric pressure (date) 30.39” (13)
Lowest barometric pressure (date) 29.77” (6,26)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 2
Cooling degree days for the month: 244

Greatest diurnal range (date): 28.3° (21)
Least diurnal range (date) 5.9° (30)

Number of days:

Fog 4
Windy 1
Thunder 1
Cloudy 8
Partly Cloudy 17
Sunny/Clear 5
Max temp ≥ 90° 5
Min temp < 60° 6
Min temp => 70° 4
Precip ≥ 0.01” 3

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CBS TV METEOROLOGIST And NJWO Member JEFF BERADELLI Tuesday 7 pm

TUESDAY OCTOBER 8,  2019 7:00 pm

CBS TV METEOROLOGIST

And NJWO Member

JEFF BERADELLI!

 Meteorologist Jeff Beradelli is Weather and Climate Contributor to CBS News in NYC. He holds a BS in meteorology from Cornell University and is currently enrolled at Columbia University earning his Masters Degree in Climate and Society. Jeff’s proudest achievement was earning a spot in the NJWO during President Chris Standal’s tenure when he was in his early teens (Jeff, not Chris). Since then it has been all down hill. He has traveled back and forth from New York to Florida as a TV Meteorologist having worked in Buffalo, Tampa, NYC, Miami, West Palm Beach and now back in NYC again. Besides CBS, you can also watch him on WPIX TV on a fill-in basis. Jeff will be speaking about OUR UPPER LEVEL Patten and upcoming Seasons

He will also be discussing his career, where it has taken him, and what he is doing now !

Many NJWO members remember Jeff as a Teen who was lucky enough to have a Mom who would drive him to meetings every month!!!

Lets have a  GREAT  CROWD TO WELCOME  JEFF HOME TO NJWO!

WESTWOOD, NJ LIBRARY. 7PM TUESDAY!

AUGUST 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

AUGUST 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer

August 2019 was much wetter and a bit warmer than normal. My max temp
(84.5°) was only 0.3° above normal but my min temp (67.6°) was more
significantly 3.4° above normal, resulting in the mean temperature (76.0°)
to be 1.8° above normal. My total precipitation of 7.63″ was 4.44” above
the normal August value for my station of 3.19”. There were more days
but generally smaller daily amounts of precipitation than in July leading to
an about normal amount of 11 days with measurable precipitation, Nine of
those eleven days fell during two generally wet periods from August 3-7
and August 18-23 During these two periods 7.17” was recorded (over 96%
of the month’s total).

There were only one notable relatively cool periods (max temps below 80°)
during the month, a total of 6 straight days from August 23rd-29th.The
coolest August min temp of 59.4° was reached at the end of this streak
on the 30th. We didn’t have much rain during this period (0.34”) but we
did have a lot of clouds to help keep the temperatures down. Conversely,
the hottest period of the month was just prior to this cooler period, from
the 18th-20th with 3 straight days of max temps over 90, including the
month’s hottest reading of 92.2° on the 18th.

There were 11 days with measurable precipitation, highlighted by the
monthly maximum of 1.22″ on the 21st during a period of numerous
thunderstorms on the stormiest period of the month (2.53” from the
20th-23rd) Other thunderstormy periods included the 3rd-4th (1.61”)
and the 7th-8th (2.23”) Conversely there was one notably significant
dry period during August when no rain fell (7 straight days from the 8th-
14th). There was also a significantly dry period at the end of the month
(8 days from the 24th-31st) when only one day had rain (0.31” on the
28th) July had a very similar dry spell on those same last 8 days of the
month. With the generally wet month once again, these dry periods did
not start showing any adverse effects on the vegetation in the immediate
area.

The highest barometric pressure reading of the month of only 30.25”
occurred on the 25th and 31st during the end of the month dry period.
The lowest reading was 29.74” on the 7th and 8th occurred around the
time of two consecutive thunderstormy days of over an inch each day on
the 6th and 7th. This lowest reading was the same value as the lowest
reading in July.

The highest dew point temperature reached during the month was 78°
on the hottest day of the month on the 18th , a, in the middle of our
most humid period of the month with 12 straight days with dew point
temps over 70° There also was a 9 day streak of 70 or greater dew
points on the first 9 days of the month. There were 22 days in July
when dew point temps were 70° or higher, including 10 days at or
above 75°, mostly during the middle third of the month. The lowest
dew point temperature value was reached on the 24th when a value
of 52° was reached. There were 8 days during the month when the
dew point temps were in the 50s, most of which occurred during the
previously discussed coolest period of the month. .

August had 10 cloudy days, 19 partly cloudy days, and only 2 clear/
sunny days with an unusual higher amount of partly cloudy days due
to numerous thunderstorm days during the month (9 with several multi-
storm days) There were 0 heating degree days and 342 cooling degree
days during the month. There were 8 foggy days, 7 windy days, and 9
days with thunder.

Once again daily max/min temperatures didn’t vary very much, a typical
trend during the summer period. My maximum temperature frequencies
included 5 days over 90°, 20 days between 80° and 89°, and 6 days
between 70° and 79°. On the minimum temperature frequency side of
things, there were 2 days below 60°, 14 days between 60° and 69°
and 15 days 70° and above. The coldest daily max temperature was
72.6° on the cloudy 23rd while the warmest daily min temp of 73.9°
was on the 13th, when the temps were muted due to high dew points
and a lot of clouds.

The diurnal range daily monthly average was 17.0° (- 3.0°).
Our greatest daily range of temperature was 26.1° on the 30th
(85.5°-59.4°). We had a total of 8 days with daily ranges above
20°. Our lowest range of temperature was 7.6° (72.6°-65.0°) on
the 23rd (our coolest max day of the month). There were only 3
total days with diurnal temperature ranges of less than 10°
throughout the month, occurring on three of the many cloudy
days during the month but not particularly rainy/stormy at all. .

August 2019 was a typical mid-summer month, with heat, humidity
and numerous heavy thunderstorms predominating and only two
significantly long dry spells. Incredible Hurricane Dorian formed
during August and ravaged the Bahamas and the SE coast of the
United States into early September, but spared my area of
Maryland fortunately. .

AUGUST 2019

ROCKVILLE 2.8 WNW MARYLAND

SUMMARY STATISTICS

Average high temperature 84.5° (+ 0.3°)
Average low temperature 67.6° (+ 3.4°)
Mean temperature 76.0° (+ 1.8°)

Precipitation 7.63″ (+ 4.44“)
Greatest daily amount (date) 1.22″ (21)
Greatest storm total (dates) 2.53” (20-23)
2019 year-to-date precipitation total 37.66″ (+ 10.96”)

High temperature for the month (date) 92.2° (18)
Low temperature for the month (date) 59.4° (30)

Highest barometric pressure (date) 30.25” (25,31)
Lowest barometric pressure (date) 29.74” (7,8)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 0
Cooling degree days for the month: 342

Greatest diurnal range (date): 26.1° (30)
Least diurnal range (date) 7.6° (23)

Number of days:

Fog 8
Windy 7
Thunder 9
Cloudy 10
Partly Cloudy 19
Sunny/Clear 2
Max temp ≥ 90° 5
Min temp < 60° 2
Min temp => 70° 15
Precip ≥ 0.01” 11

JULY 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

JULY 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer

July 2019 was wetter and warmer than normal. My max temp (89.0°)
was 2.7° above normal and my min temp (69.9°) was even a bit more
significantly 4.2° above normal, resulting in the mean temperature
(74.4°) to be 3.4° above normal. My total precipitation of 7.03″ was
3.20” above the normal July value for my station of 3.83. There were
fewer but generally larger daily amounts of precipitation than in June
leading to a bit drier than normal 9 days with measurable precipitation,
Seven of those nine days fell during the first eleven days of the month
when 5.75” was recorded (nearly 82% of the month’s total).

There were only 2 relatively cool days (max temps below 80°) during the
month, both occurring on cloudy, rainy days on the 8th (2.86”) and 23rd
(1.06”). In fact, those were the 2 wettest days of the month. From the
14th till the end of the month temps were frequently at or above 90°
(11 such days when rounded). The warmest temperature for the month
was 96.5° on the 21st, and the coolest was 62.2° on the 25th.

There were 9 days with measurable precipitation, highlighted by the
monthly maximum of 2.86″ on the 8th during an unusually heavy morning
thunderstorm. This was my 5th wettest day ever since records were
started for this location back in January 2017. Three of the five
wettest days I have ever recorded have occurred in July. Conversely
there were 3 notably significant dry periods during July when no rain
fell (12th-16th, 18th-22nd, 24th-31st). With the generally wet
summer, these dry periods did not start showing any adverse trends
in the vegetation in the immediate area.

The highest barometric pressure reading of the month of 30.30”
occurred on the 27th, in the middle of our driest period of the month
(8 days from the 24th-31st). The lowest reading was 29.74” on the
23rd on the day of our 2nd heaviest daily rainfall of the month.

The highest dew point temperature reached during the month was 80°
on the 20th and 21st which unfortunately (for comfort’s sake), also
occurred on the 2 hottest days of the month. There were 26 days in
July when dew point temps were 70° or higher, including 12 days above
75°, spread out throughout the month. The lowest dew point temperature
value was reached on the 1st when a value of 56° was reached. There
were only 4 days during the month when the dew point temps were in the
50s.

July had 7 cloudy days, 14 partly cloudy days, and 10 clear/sunny days
with an unusual higher amount of sunny days due to the 3 long, dry spells
during the month. There were 0 heating degree days and 447 cooling
degree days during the month. There were 5 foggy days, 2 windy days,
and 8 days with thunder.

Daily max/min temperatures didn’t vary as much as in the previous few
months, a typical trend of the mid-summer period. My maximum
temperature frequencies included 15 days over 90°, 14 days between
80° and 89°, and 2 days between 70° and 79°. On the minimum
temperature frequency side of things, there were 15 days between 60°
and 69° and 16 days above 70°. The coldest daily max temperature
was 75.9° on the rainy 23rd while the warmest daily min temp of 76.4°
was on the 21st, when the max temp during the month was also reached
(96.5°).

The diurnal range daily monthly average was 19.1° (- 1.2°). Our greatest
daily range of temperature was 30.1° on the 2nd (93.5°-63.4°). We had
a total of 13 days with daily ranges above 20°. Our lowest range of
temperature was 8.0° (76.2°-68.2°) on the 8th (our wettest day of the
month). There were only 2 total days with diurnal temperature ranges of
less than 10° throughout the month, occurring on the two wettest days of
the month. .

July 2019 was a typical mid-summer month, with heat, humidity and
occasionally heavy thunderstorms predominating and conversely, some
significantly long dry spells. Tropical storm Barry developed during mid
July (11-19) in the Caribbean, and ravaged Louisiana with flooding rains
but fizzled out before reaching our area. There weren’t any problems
experienced with my weather station during the month thank goodness,
save for my recurring VPs tipping bucket problems. .

JULY 2019 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 89.0° (+ 2.7°)
Average low temperature 69.9° (+ 4.2°)
Mean temperature 79.4° (+ 3.4°)

Precipitation 7.03″ (+ 3.20“)
Greatest daily amount (date) 2.86″ (8)
Greatest storm total (dates) 4.54” (4-8)
2019 year-to-date precipitation total 37.06″ (+ 12.49”)

High temperature for the month (date) 96.5° (21)
Low temperature for the month (date) 62.2° (25)

Highest barometric pressure (date) 30.30” (27)
Lowest barometric pressure (date) 29.74” (23)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 0
Cooling degree days for the month: 447

Greatest diurnal range (date): 30.1° (2)
Least diurnal range (date) 8.0° (8)

Number of days:

Fog 5
Windy 2
Thunder 8
Cloudy 7
Partly Cloudy 14
Sunny/Clear 10
Max temp ≥ 90° 15
Min temp < 60° 0
Min temp ≥ 70° 16
Precip ≥ 0.01” 9

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JUNE 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

JUNE 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer

June 2019 was drier and a bit warmer than normal. My max temp (82.6°)
was 0.6° above normal and my min temp (64.6°) was more significantly 3.5°
above normal, resulting in the mean temperature (73.7°) to be 2.0° above
normal. My total precipitation of 2.37″ was 1.41” below the normal June
value for my station of 3.78. There were a lot of smaller amounts of daily
precipitation leading to an above normal 14 days with measurable precipitation.
These 14 days were spread out fairly evenly throughout the month.

There were 9 relatively cool days (max temps below 80°) during the month,
all occurring on or before the 14th. The rest of the month trended warm to
hot, with all 6 days with max temps of 90 or more occurring during this period,
all of which were recorded during the last week of the month. The warmest
temperature for the month was 93° on the 27th, and the coolest was 49° on
the 4th.

There were 14 days with measurable precipitation, highlighted by the monthly
maximum of 0.85″ on the 13th during overnight showers early on that day.

The highest barometric pressure reading of the month of 30.23” occurred on
the 4th, on the same day as my lowest temperature of the month (48.8°).
The lowest reading was 29.51” on the 20th during a 4 day slightly wet period.

The highest dew point temperature reached during the month was 76° on
the 19th and 20th, during our lowest pressure readings of the month.
There were 14 days in June when dew point temps were 70° or higher,
all but 2 occurring during the last 15 days of the month. The lowest dew
point temperature value was reached on the 3rd (2nd coldest day of the
month) when a value of 39° was reached.

June had 8 cloudy days, 17 partly cloudy days, and only 5 clear/sunny days
despite the overall dryness during the month. There were 4 heating degree
days and 266 cooling degree days during the month. There were 3 foggy
days, 3 windy days, and 6 days with thunder.

Daily max/min temperatures didn’t vary as much as in the previous spring
months. My maximum temperature frequencies included 6 days over 90°,
14 days between 80° and 89°, and 10 days between 70° and 79°.
On the minimum temperature frequency side of things, there was 1 day
below 50°, 4 days between 50° and 59°, 16 days between 60° and 69°
and 9 days above 70°. The coldest daily max temperature was 71.1° on
the 10th while the warmest daily min temp of 73.0° was on the 27th,
when the max temp during the month was also reached (93.3°).

The diurnal range daily monthly average was 18.4° (- 2.8°).
Our greatest daily range of temperature was 27.3° on the 4th
(76.1°-48.8°). We had a total of 12 days with daily ranges above
20°. Our lowest range of temperature was 9.6° (79.8°-70.2°) on
the 7th. There were only 3 total days with diurnal temperature
ranges of less than 10° throughout the month, all occurring on or
before the 10th of the month. .

June 2019 was a typical first month of summer, with the heat taking
over during the last half of the month after a cooler first half, with
spring trying to hang on. No tropical activity developed anywhere near
my region. . There weren’t any problems experienced with my weather
station during the month thank goodness, save for my recurring VPs
tipping bucket problems. .

JUNE 2019 – ROCKVILLE 2.8 WNW MARYLAND
SUMMARY STATISTICS

Average high temperature 82.9° (+ 0.6°)
Average low temperature 64.6° (+ 3.5°)
Mean temperature 73.7° (+ 2.0°)

Precipitation 2.37″ (- 1.41”)
Greatest daily amount (date) 0.85″ (13)
Greatest storm total (dates) 0.90” (12-13)
2019 year-to-date precipitation total 23.00″ (+2.26”)

Snowfall 0.0”
Seasonal snowfall total (final) 26.8″

High temperature for the month (date) 93.3° (27)
Low temperature for the month (date) 48.8° (4)

Highest barometric pressure (date) 30.23” (4)
Lowest barometric pressure (date) 29.51” (20)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 4
Cooling degree days for the month: 266

Greatest diurnal range (date): 27.3° (4)
Least diurnal range (date) 9.6° (7)

Number of days:

Fog 3
Windy 3
Thunder 6
Cloudy 8
Partly Cloudy 17
Sunny/Clear 5
Max temp ≥ 90° 6
Min temp < 60° 4
Min temp => 70° 9
Precip ≥ 0.01” 14

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MAY 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

MAY 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer

May 2019 was wetter and warmer than normal. My max temp (76.7°)

was 2.9° above normal and my min temp (59.7°) was even more

significantly 7.9° above normal, resulting in the mean temperature

(68.2°) to be 5.4° above normal. My total precipitation of 6.24″ was

1.97” above the newly computed normal precipitation May value for

my station of 4.27. There were a lot of smaller amounts of daily

precipitation leading to an above normal 13 days with measurable
precipitation, Nine of the 13 days occurred during the first 16

days of the month, including two 4 day streaks of rainfall (1.88”

from May 2-5 and 2.78” from May 10-13).

There were a few cooler than normal days during these wet periods,

particularly from May 12-15 with generally max temps in the 50s

and lows in the 40s (the lowest being 44.3° on the 15th). The rest

of the month had seasonable to seasonably warm temperatures,

highlighted by my first 90° max on the 29th. There were fourteen

80°+ max temps and fifteen 60°+ mins during the month.

There were 13 days with measurable precipitation, highlighted by

the monthly maximum of 1.28″ on the 10th that started our wettest

period of the month through the 13th that was detailed earlier

There were two other notable precipitation days during the month

(1.05” on the 5th and 0.93” on the 28th).

The highest barometric pressure reading of the month of 30.36”

occurred on the 1st. The lowest reading was a rather modest

29.65” on the 29th on the hottest day of the month.

The highest dew point temperature reached during the month was

74° on the 19th and 28th. There were 8 days in May when dew point

temps were 70° or higher, values I consider humid for May.

My warmest air temperature of the month (90.2°) was recorded

during a particularly muggy period on the 29th. The lowest dew point

temperature value was reached on the 14th (2nd coldest day of the
month) when a value of 41° was reached.

May had 11 cloudy days, 13 partly cloudy days, and 7 clear/sunny

days. There were 63 heating degree days and 162 cooling degree

days during the month. There were 5 foggy days, 2 windy days,

and 5 days with thunder.

Daily max/min temperatures varied as they usually do during the

spring. My maximum temperature frequencies included 1 day over

90°, 14 days between 80° and 89°, 9 days between 70° and 79°,

4 days between 60° and 69°, and 3 days between 50° and 59°.

On the minimum temperature frequency side of things, there

were 4 days between 40° and 49°, 12 days between 50° and 59°,

13 days between 60° and 69° and 2 days above 70°. The coldest

daily max temperature was 55.0° on the 13th while the warmest

daily min temp of 71.3° was on the 20th.

The diurnal range daily monthly average was 19.0° (- 3.0°). Our

greatest daily range of temperature was 27.3° on the 2nd

(84.9°-57.6°) and 15th (71.6°-44.3°). We had a total of 11 days

with daily ranges above 20°. Our lowest range of temperature

was 5.2° (66.4°-61.2°) on the 8th. There were 5 total days with

diurnal temperature ranges of less than 10° throughout the

month, all occurring on or before the 13th.

May 2019 was a typical transitional month from spring to

summer, with patterns during the month generally filling the

bill quite well. No problems were experienced with my
weather station during the month thank goodness.

MAY 2019 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 76.7° (+ 2.9°)
Average low temperature 59.7° (+ 7.9°)
Mean temperature 68.2° (+ 5.4°)

Precipitation 6.24″ (+ 1.97”)
Greatest daily amount (date) 1.28″ (10)
Greatest storm total (dates) 2.78” (10-13)
2019 year-to-date precipitation total 20.29″ (+3.57”)

Snowfall 0.0”
Seasonal snowfall total (final) 26.8″

High temperature for the month (date) 90.2° (29)
Low temperature for the month (date) 44.3° (15)

Highest barometric pressure (date) 30.36” (1)
Lowest barometric pressure (date) 29.65” (29)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 63
Cooling degree days for the month: 162

Greatest diurnal range (date): 27.3° (2,15)
Least diurnal range (date) 5.2° (8)

Number of days:

Fog 5
Windy 2
Thunder 5
Snow 0
Sleet 0
Glaze 0
Cloudy 11
Partly Cloudy 13
Sunny/Clear 7
Max temp ≥ 80° 15
Min temp < 50° 4
Min temp =< 32° 0
Precip ≥ 0.01” 13

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APRIL 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

APRIL 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer

April 2019 was drier and warmer than normal. My max temp (68.8°) was 3.5° above normal

and my min temp (49.7°) was even more significantly 6.8° above normal, resulting in the

mean temperature (59.3°) to be 5.2° above normal. My total precipitation of 2.36″ was

0.93” below the newly computed normal precipitation April value for my station of 3.29”.

There was no snowfall recorded, though some northern county areas did record a few

trace flakes on the morning of April 1. There were a lot of smaller amounts of daily

precipitation leading to an above normal 13 days with measurable precipitation. .

There were a few colder than normal days during the first few days of the month which

included the only day with a freezing min (30.2° on the 1st) during all of April. The rest

of the month had seasonable to seasonably warm temperatures, but nothing summerlike

as above 80° was reached only twice during the month. There were 5 days during the

month when mins of 60° or greater were reached however.

There were 13 days with measurable precipitation, highlighted by the monthly maximum

of 0.67″ on the 26th helped by a strong mid-afternoon thunderstorm accompanied by

my monthly lowest pressure reading of 29.36”. The wettest storm period of the month

was on the 25th-26th when a total of 0.71” was recorded. Precipitation was spread

fairly evenly throughout the month with only two modest 4 day streaks of no rain on

the 1st-4th and 21st-24th. The highest barometric pressure reading of the month of

30.46” occurred on the 29th. There were no really notable precipitation days during

the month as all days with measurable precipitation were well under a half an inch daily

except of course for the rainiest day on the 26th as already noted. .

The highest dew point temperature reached during the month was 68° on the 19th.

There were 11 days in April when dew point temps were 60° or higher, values I consider

humid for April. My warmest air temperature of the month (80.8°) was recorded a few

days later on the 23rd. The lowest dew point temperature value was reached on the 1st

(coldest day of the month) when a value of 15° was reached.

April had 12 cloudy days, 16 partly cloudy days, and only 2 really clear/sunny days.

There were 196 heating degree days and 23 cooling degree days during the month.

There were 5 foggy days, 2 windy days, and 3 days with thunder during April.

Daily max/min temperatures varied as they usually do during the spring. My maximum

temperature frequencies included 2 days over 80°, 14 days between 70° and 79°, 10

days between 60° and 69°, 2 days between 50° and 59°, and 2 days between 40° and

49°. On the minimum temperature frequency side of things, there were 3 days

between 30° and 39°, 11 days between 40° and 49°, 11 days between 50° and 59° and

5 days above 60°. The coldest daily max temperature was 46.3° on the 1st while the

warmest daily min temp of 64.6° was on the 19th.

The diurnal range daily monthly average was 19.1° (- 3.3°). Our greatest daily range of

temperature was 33.0° on the 3rd, formed from a high of 66.4° and the low of 33.4°.

We had a total of 5 days with daily ranges above 25.0°. Our lowest range of

temperature was 9.0° (73.6°-64.6°) on the 19th during our highest dew point and

warmest min values of the month. There were 8 total days with diurnal temperature

ranges of less than 15.0° throughout the month, spread out fairly evenly..

April 2019 was a typical transitional month from winter to spring, with patterns during

the month generally filling the bill quite well. No problems were experienced with my

weather station during the month thank goodness. I recovered all of the winter snow-
measuring devices during the month, and broke out my lightning detector.

APRIL 2019 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 68.8° (+ 3.5°)
Average low temperature 49.7° (+ 6.8°)
Mean temperature 59.3° (+ 5.2°)

Precipitation 2.36″ (- 0.93”)
Greatest daily amount (date) 0.67″ (26)
Greatest storm total (dates) 0.71” (25-26)
2019 year-to-date precipitation total 14.39″ (+1.70”)

Snowfall 0.0”
Seasonal snowfall total (final) 26.8″

High temperature for the month (date) 80.8° (23)
Low temperature for the month (date) 30.2° (1)

Highest barometric pressure (date) 30.46” (29)
Lowest barometric pressure (date) 29.36” (26)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 196
Cooling degree days for the month: 23

Greatest diurnal range (date): 33.0° (3)
Least diurnal range (date) 9.0°(19)

Number of days:

Fog 5
Windy 2
Thunder 3
Snow 0
Sleet 0
Glaze 0
Cloudy 12
Partly Cloudy 16
Sunny/Clear 2
Max temp ≥ 70° 16
Max temp =< 32° 0
Min temp =< 32° 1
Precip ≥ 0.01” 13

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MARCH 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

MARCH 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer

March 2019 wound up about normal for temperatures (cooler than normal

max temps balanced out by warmer than normal min temps) based on new

normals for my station developed out of the Oregon State Univ. PRISM

program. My max temp (51.7°) was 1.8° below normal but my min temp

(35.1°) was 1.7° above normal, resulting in the mean temperature (43.4°)

to be normal. My total precipitation of 4.67″ was 0.93 above the newly

computed normal precipitation March value for my station of 3.74”.

Monthly total snowfall was 2.5”, bringing the seasonal total to 26.8”,

probably about normal for this time of the winter. Snow normals are
not computed by PRISM that I know of but I believe this March

amount was within normal amounts for the month.

There only one really cold day during the month (maximum on the 6th of

28.7°, minimum of 18.9°) for my only sub-freezing max for the month,

but the first 9 days of the month were generally colder than normal,

roughly averaging out with max temps in the upper 30s and min temps

in the upper 20s. All the monthly snowfall fell during this period. The

rest of the month was generally milder than normal including 3 days

with max temps up in the 70s.

There were 10 days with measurable precipitation, highlighted by the

monthly maximum of 2.40″ on the 21st, easily the wettest day of the

year so far accompanied by my monthly lowest pressure reading of

29.57” on that day and the 22nd as the storm bottomed out right

around midnight. The max snowfall for the month of 1.5” fell on the

1st. The wettest storm period of the month was on the 21st-22nd

when a total of 2.58” was recorded. With this very notable

exception most of the other precipitation during the month fell

during that cold period around the beginning of the month. The

highest barometric pressure reading of the month of 30.55”
on the 27th occurred during a dry period that lasted the rest

of the month after the big rain on the 21st. There were no

other really notable precipitation days during the month as all

other wet days were well under an inch daily.

The highest dew point temperature reached during the month was

62° on the 15th when I also recorded my warmest reading of the

month (75.6°). The lowest dew point temperature value was

reached on the 6th (coldest day of the month) when a value of

+5° was recorded.

March had 11 cloudy days, 12 partly cloudy days, and 8 clear/sunny

days. There were 671 heating degree days and 1 cooling degree day

during the month. There were 7 foggy days, 2 windy days, and 3

days with snowfall during the month.

Daily max/min temperatures varied a bit more than they did in

February. My maximum temperature frequencies included 3 days

over 70°, 5 days between 60° and 69°, 7 days between 50° and 59°,

9 days between 40° and 49°, 6 days between 30° and 39°, and 1 day

below 30°. On the minimum temperature frequency side of things,

there were 2 days below 20°, 5 days between 20° and 29°, 18 days

between 30° and 39°, 5 days between 40° and 49° and 2 days above

50°.

The coldest daily max temperature was 28.7° on the 6th while the

warmest daily min temp of 55.9° was on the 15th.

The diurnal range daily monthly average was 16.5° (- 3.6°). Our

greatest daily range of temperature was 33.1° on the 31st,

formed from a high of 66.1° and the low of 33.0°. We had a

total of 8 days with daily ranges above 20.0°. Our lowest

range of temperature was 5.2° (36.2°-31.0°) on the 1st

during our biggest snow of the month. There were 6 total

days with diurnal temperature ranges of less than 10.0°

throughout the month, mostly during the colder/wetter first

third of the month. It’s an interesting pattern to note that

the min range occurred on the first day of the month and the

max range occurred on the last day of the month.

March 2019 was a typical transitional month from winter to

spring, with patterns during the month filling the bill quite

well. No problems were experienced with my weather station

during the month thank goodness.

MARCH 2019 – ROCKVILLE 2.8 WNW MARYLAND –

SUMMARY STATISTICS

Average high temperature 51.7° (- 1.8°)
Average low temperature 35.1° (+ 1.7°)
Mean temperature 43.4° (+ 0.0°)

Precipitation 4.67″ (+0.93”)
Greatest daily amount (date) 2.40″ (21)
Greatest storm total (dates) 2.58” (21-22)
2019 year-to-date precipitation total 12.03″ (+2.63”)

Snowfall 2.5”
Greatest daily amount (date) 1.5″ (1)
Greatest storm total (dates) 1.5” (1)
Seasonal snowfall total 26.8″

High temperature for the month (date) 75.6° (15)
Low temperature for the month (date) 18.9° (6)

Highest barometric pressure (date) 30.55” (27)
Lowest barometric pressure (date) 29.57” (21,22)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 671
Cooling degree days for the month: 1

Greatest diurnal range (date): 33.1° (31)
Least diurnal range (date) 5.2° (1)

Number of days:

Fog 7
Windy 2
Snow 3
Sleet 0
Glaze 0
Cloudy 11
Partly Cloudy 12
Sunny/Clear 8
Max temp ≥ 70° 3
Max temp =< 32° 1
Min temp =< 32° 8
Precip ≥ 0.01” 10

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FEBRUARY 2019 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

FEBRUARY 2019 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND

by Kevin Shaw, Observer

February 2019 was milder and a bit wetter than normal, based on new normals

for my station developed out of the Oregon State Univ. PRISM program. My

max temp (45.7°) was 0.9° above normal but my min temp (31.8°) was a much

more significant 5.0° above normal, resulting in the mean temperature (38.7°)

to be 2.9° above normal. My total precipitation of 3.44″ was 0.69″ above the

newly computed normal precipitation February value for my station of 2.75”.

Monthly total snowfall was 7.3”, bringing the seasonal total to 24.3”, probably

about normal for this time of the winter. Snow normals are not computed by

PRISM that I know of but I believe this February amount is about normal for

the month.

There was only one really cold day during the month (maximum on the 1st of

21.6° with the minimum the next morning on Ground Hog Day the coldest min

for the month at 13°). Unlike the single digit mins of the last two days of

January at the beginning of this short cold spell there were no single digit

mins recorded in February. .

There were 11 days with measurable precipitation, highlighted by the monthly

maximums of 0.75″ on the 20th and 24th accompanied by my monthly lowest

pressure reading of 29.47 on the 24th and the 5.5” of snow on the 20th as

the max snowfall day of the month. The wettest storm period of the month

was on the 10th-12th when a total of 1.27” was recorded. The highest

barometric pressure reading of the month of 30.80” on the 9th occurred

just the day before this storm started. This reading is now the highest of

2019, and highest since 30.83” was recorded last year back on February 13.

There were no other notable precipitation days during the month with just

a few widely spread out small amounts of rain and/or snow.

The highest dew point temperature reached during the month was 53° on

the 5th just 4 days after the lowest dew point temperature value was

reached during the month with the only below zero reading of -2° recorded

on February 1.

February had 11 cloudy days, 14 partly cloudy days, and 3 clear/sunny days.

There were 736 heating degree days and 0 cooling degree days during the

month. There were 11 foggy days, 3 windy days, 3 days with glaze, 2 days

with sleet, and 4 days with snowfall during the month. The windy day

category is subjective with no personal real data values to back it, just

based on my descriptive email daily weather posts that are posted on

weathertogether.net.

Daily max/min temperatures varied a bit less than they did in January.

My maximum temperature frequencies included 2 days between 60° and

69°, 9 days between 50° and 59°, 7 days between 40° and 49°, 9 days

between 30° and 39°, and 1 day below 30°. On the minimum temperature

frequency side of things, there were 2 days between 10° and 19°, 8 days

between 20° and 29°, 14 days between 30° and 39°, and 4 days between

40° and 49°. The coldest daily max temperature was 21.6° on the 1st

while the warmest daily min temp of 46.8° was on the 15th.

The diurnal range daily monthly average was 13.9° (- 4.1°). Our greatest

daily range of temperature was 27.3° on the 4th, formed from a high of

58.8° and the low of 31.5°. We had a total of 7 days with daily ranges

above 20.0°. Our lowest range of temperature was 2.6° (33.9°-31.3°) on

the 12th during our biggest precipitation event of the month. There were

a significantly above normal 12 total days with diurnal temperature ranges

of less than 10.0° throughout the month. Many cloudy/rainy days held the

daily variation to these low values and also the still low sun angle helped to

suppress this month’s daily diurnal ranges.

Fortunately I’ve had no more problems with my VP2 weather station as I

did early last year. I am constantly checking on my data quality frequently,

along with discussion and data comparison with several of my Maryland

weather cohorts and reliable online close-by observer data locations. I

made considerable use of a snow stake placed in the ground just below

and out from my balcony this winter that I read easily with the help of

binoculars to help supplement my new snow and snow on the ground

amounts when it is too dangerous to go out to my snowboard as often

as I would like to. I continue to occasionally (as time allows) submit

GLOBE Cloud observations, complete with submission of sky pictures

at the time of the observation, usually timed with the passage of

satellites and/or solar noon (about 70 minutes past actual EDT noon).

Please ask me any questions you want at any time about my station

setup and/or my data through any means available to you.

FEBRUARY 2019 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 45.7° (+ 0.9°)
Average low temperature 31.8° (+ 5.0°)
Mean temperature 38.7° (+ 2..9°)

Precipitation 3.44″ (+0.69”)
Greatest daily amount (dates) 0.75″ (20,24)
Greatest storm total (dates) 1.27” (10-12)
2019 year-to-date precipitation total 7.36″ (+1.70”)

Snowfall 7.3”
Greatest daily amount (date) 5.5″ (20)
Greatest storm total (dates) 5.5” (20)
Seasonal snowfall total 24.3″

High temperature for the month (date) 67.3° (5)
Low temperature for the month (date) 13.0° (2)

Highest barometric pressure (date) 30.80” (9)
Lowest barometric pressure (date) 29.47” (24)

Peak wind gust (date/direction): N/A

Heating degree days for the month: 736
Cooling degree days for the month: 0

Greatest diurnal range (date) 27.3° (4)
Least diurnal range (date) 2.6° (11)

Number of days:

Fog 11
Windy 3
Snow 4
Sleet 2
Glaze 3
Cloudy 11
Partly Cloudy 14
Sunny/Clear 3
Max temp ≥ 60° 2
Max temp =< 32° 1
Min temp =< 32° 15
Precip ≥ 0.01” 11

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