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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February 2019 Meeting Cancelled

We regret that we must cancel the February meeting due ironically to inclement weather. Members and our guest speaker sometimes travel great distances to attend and with the weather not looking great tomorrow we decided to cancel this month’s meeting. Since we meet at a shared public locations it’s not easy to just re-schedule this to another day. Furthermore our speaker’s schedule, Jeff is quite complex.

We hope to have Jeff back to present to NJWO in the near future. Keep checking back for more information!

Meteorologist Jeff Berardelli to Speak at February 2019 NJWO Meeting

Meteorologist Jeff Berardelli

February 12, 2019 NJWO meeting is a must attend! Our own meteorologist Jeff B will be attending our meeting and speaking on a topic TBA.

Our meeting time is 7 pm at the Westwood Free Public Library, Westwood, NJ. More details can be found on the http://www.njwo.org web page or Facebook page: https://www.facebook.com/groups/101376533107/

Jeff’s bio:

Meteorologist Jeff Berardelli 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.

ROCKVILLE 2.8 WNW MAYLAND DECEMBER 2018 MONTHLY SUMMARY AND CLIMATE STATISTICS FOR THE NJWO BLOG

DECEMBER 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND

by Kevin Shaw, ObserverDecember 2018 was a bit warmer and wetter than normal, based on new normals
for my station developed out of the PRISM program out of Oregon State Univ.
My max temp (46.3°) was 1.1° above normal, my min temp (33.4°) was 5.2°
above normal, and my mean temperature (39.9°) was 3.2° above normal. My
total precipitation of 7.35″ was 4.25″ above the newly computed normal
precipitation December value for my station of 3.10”. There was no snowfall
during the month. Snow normals are not computed by PRISM that I know of
but this zero amount was considerably below normal for December.

There were no really unusually cold or warm periods during the month. There
were 12 days with measurable precipitation, highlighted by the monthly
maximum of 3.24″ on the 15th, occurring at the end of our longest dry
period of the month between the 3rd and the 13th. Other notable daily
rainy days was 0.98” on the 21st when our highest temp of the month was
reached (64.8°) and the lowest pressure was recorded (29.17”) and a week
later on the 28th when 1.01” was recorded. Oddly enough the day before that
rain I reached my highest pressure reading of the month (30.63” on the 27th).

The highest temperature reached during the month was 64.8° on the 21st
while the lowest temperature in December was a modest 22.1° early on the
8th. The highest dew point temperature reached during the month was 61°
on the 21st while the lowest dew point temperature value reached during the
month was another modest reading of 18°, recorded 4 straight days beginning
on the 7th.

November had 14 cloudy days, 12 partly cloudy days, and 5 clear/sunny days.
There were 770 heating degree days and 0 cooling degree days during the month.
There were 8 foggy days, 1 windy day, and no frozen precipitation days nor
thunder heard 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 didn’t vary as much as they did in November. My
maximum temperature frequencies included 1 day above the 60° mark, 8 days
between 50° and 59°, 16 days between 40° and 49° and 6 days between 30°
and 39°, 5 of which occurred during the first 10 day period of the month.
On the minimum temperature frequency side of things, there were 11 days
between 20° and 29°, 15 days between 30° and 39°, and 5 days between
40° and 49°. The coldest daily max temperature was 31.9° on the 9th while
the warmest daily min temp of 44.9° was on the 15th.

The diurnal range daily monthly average was 13.0°. Our greatest daily range
of temperature was 26.2° on the 20th, formed from a high of 58.7° and the
low of 32.5°. We had a total of only 4 days with daily ranges above 20.0°.
Our lowest range of temperature was 3.2° (31.9°-28.7°) on the 9th during a
cloudy, cold, dry day when I had my only sub-freezing max temp day of the
month. There were a significantly above normal 9 total days with diurnal
temperature ranges of less than 10.0° throughout the month. 14 cloudy days
during the month and 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
earlier in the 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 finally have
deployed my snow board, just ahead of our biggest snowstorm of the season
so far on Jan 12-13, 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.

DECEMBER 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 46.3° (+1.1°)
Average low temperature 33.4° (+5.2°)
Mean temperature 39.9° (+3.2°)

Precipitation 7.35″ (+4.25”)
Greatest daily amount (date) 3.24″ (15)
Greatest storm total (dates) 3.74” (14-16)
2018 year-to-date precipitation total 66.16″ (+24.25”)

High temperature for the month (date) 64.8° (21)
Low temperature for the month (date) 22.1° (8)

Highest barometric pressure (date) 30.63” (27)
Lowest barometric pressure (date) 29.17” (21)

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

Heating degree days for the month: 770
Cooling degree days for the month: 0

Greatest diurnal range (date): 26.2° (20)
Least diurnal range (date) 3.2° (9)

Number of days:

Fog 8
Windy 1
Thunder 0
Cloudy 14
Partly Cloudy 12
Sunny/Clear 5
Max temp ≥ 50° 9
Min temp =< 32° 13
Precip ≥ 0.01” 12

ROCKVILLE 2.8 WNW MAYLAND NOVEMBER 2018 MONTHLY SUMMARY AND CLIMATE STATISTICS FOR THE NJWO BLOG

NOVEMBER 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND

By Kevin Shaw, Observer in Charge

November 2018 was colder and wetter than normal, based on new normals for

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

max temp (48.9°) was 7.0° below normal, my min temp (37.0°) was 0.2° above

normal, and my mean temperature (43.0°) was 3.4° below normal. My total

precipitation of 7.76″ was 4.18″ above the newly computed normal precipitation

November value for my station of 3.58”. Snowfall was 2.1″ during the month.

Snow normals are not computed by PRISM that I know of but most likely this

amount is a bit above normal for November.

My first sub-freezing minimum temperature of the fall season was 30.8° late

on the 10th which is later than old long-term averages but pretty close to the

dates we have been seeing over the last 5-10 years. Unusual cold around

Thanksgiving was the most notable temperature highlight, with high temps

mostly holding at or below freezing on Turkey Day and the day after.

Minimums were below normal but not as much as the max temps. There were

12 days with measurable precipitation, and 4 days with an inch or more,

highlighted by the monthly maximum of 1.72″ on the 24th, just after our

coldest period of the month when the highest pressure was recorded at 30.64″

on the 23rd. 29.48″ on the 26th was the lowest pressure of the month at the

end of our biggest rainy period of the month of 1.98″ (24th-26th)

The highest temperature reached during the month was 73.2° on the 1st while

the lowest temperature in November was a chilly 25.5° early on the 23rd.

The highest dew point temperature reached during the month was 64° on the

2nd while the lowest dew point temperature value reached during the month

was 3° on the 23rd.

Barometric pressure differences during the month increased more over

October’s readings, with the lowest value found on the 26th when 29.48” was

reached at the end of the wettest storm period of the month (1.98” from the

24th-26th) October’s highest pressure value for the month (30.64”) occurred

just a few days before, on the coldest day of the month on the 23rd. This type

of pattern is quite common during the colder months of the year, when greater

dynamics of pressure systems are more frequent.

November had 14 cloudy days, 13 partly cloudy days, and only 3 clear/sunny days.

There were 660 heating degree days and 0 cooling degree days during the month.

There were 9 foggy days, 6 windy days, and 1 day (each) of snow, sleet, and

freezing rain (the 15th). There was no thunder heard 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 more than the previous warmer months.

My maximum temperature frequencies included 2 days between 70° and 79°,

no days between 60° and 69°, 9 days between 50° and 59°, 14 days between

40° and 49° and 5 days between 30° and 39°. On the minimum temperature

frequency side of things, there were 6 days between 20° and 29°, 15 days

between 30° and 39°, 6 days between 40° and 49°, and 3 days between 50°

and 59°. The coolest daily max temperature was 32.6° on the 23rd with

the warmest daily min temp of 53.5° on the 2nd.

The diurnal range daily monthly average was 14.2°. Our greatest daily range

of temperature was only 22.2° on the 25th, formed from a high of 58.1° and

low of 35.9°. We had a total of only 3 days with daily ranges above 20.0°.

Our lowest range of temperature was 4.2° (48.2°-44.0°) on the 9th during

one of several cloudy, cool, and rainy days that occurred this month. There

were a significantly above normal 13 total days with diurnal temperature

ranges of less than 10.0° throughout the month. The more frequent

cloudier and wetter days helped to suppress this month’s daily diurnal

ranges.

Fortunately I’ve had no more power (battery) problems with my VP2

weather station as I did back in September. I am still 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. I have prepared the outside components

for the winter, such as removal of the inner cylinder and funnel to aide

in collecting snow and other freezing precipitation types but I have not

deployed my snow board yet.. 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.

NOVEMBER 2018 – ROCKVILLE 2.8 WNW MD – CLIMATE STATS

Average high temperature 48.9° (- 7.0°)
Average low temperature 37.0° (+ 0.2°)
Mean temperature 43.0° (- 3.4°)

Precipitation 7.76″ (+ 4.18”)
Greatest daily amount (date) 1.72″ (24)
Greatest storm total (dates) 1.98” (24-26)
2018 year-to-date precipitation total 58.81″ (+ 20.00”)
High temperature for the month (date) 73.2° (1)
Low temperature for the month (date) 25.5° (23)

Highest barometric pressure (date) 30.64” (23)
Lowest barometric pressure (date) 29.48” (26)

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

Heating degree days for the month: 660
Cooling degree days for the month: 0

Greatest diurnal range (date): 22.2° (25)
Least diurnal range (date) 4.2° (9)

Number of days:

Fog 9
Windy 6
Thunder 0
Cloudy 14
Partly Cloudy 13
Sunny/Clear 3
Max temp ≥ 70° = 2
Min temp =< 32° = 10
Precip ≥ 0.01” = 12

Marcella Monthly Data November 2018

Marcella Monthly Data November 2018

OCTOBER 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND FOR THE NJWO BLOG

OCTOBER 2018 MONTHLY SUMMARY FOR ROCKVILLE 2.8 WNW MARYLAND
by Kevin Shaw, Observer in Charge

October 2018 was warm and dry. It was the driest month of this year since 1.62″ was recorded in March.
This reversed the generally wet pattern of the past months, particularly the July-September period. The
first 11 days of the month were warm, with 8 maximum temperatures of 80° or greater, and averaged 73.2°.
The last 20 days of the month contrasted significantly with consistently below normal temperatures, averaging
51.0°. The strong front that passed through on the 11th marked the change with the wettest calendar day
of the month (0.91″) All but 0.01″ of the month’s precipitation fell on the 11th or later. The rainfall on the
11th were from the remnants of Hurricane Michael. Another storm, more of the nor’easter type, fell from
the 26th till early on the 28th with a storm total of 1.24″. At the end of the month I still didn’t have a
freezing low temperature, but I did have some frosty mornings during the later days of October. Fall color
change was delayed, and peaked in early November. It was a rapid change after much of the month still had
predominantly green foliage. The year to date rainfall amount of 51.05″ was still well above normal, and many
Maryland stations look to break long term annual rainfall records.

The highest temperature reached during the month was 85.6° on the 4th while the lowest temperature in
October was a frosty 33.7° on the 22nd. The highest dew point temperature reached during the month
was 75° during our early month warm, humid spell on several days (4,7,8,11) while the lowest dew point
temperature value reached during the month was 30° on the 18th and 25th.

Barometric pressure differences during the month increased a bit over the previous few months, with the
lowest values found on the 11th and 12th, when 29.52” was reached during the passage of Hurricane
Michael remnants. The nor’easter on the 26th only reached a low of 29.60”. October’s highest pressure
value for the month (30.46”) occurred on the chilly, dry 18th.

October had 8 cloudy days, 14 partly cloudy days, and 9 clear/sunny days. There were 281 heating degree
days and 90 cooling degree days during the month. There were 9 foggy days, 7 windy days, and only 1 day
with thunder 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 more than the previous hot, humid summer months. My maximum
temperature frequencies included 8 days between 80° and 89°, 3 days between 70° and 79°, 8 days
between 60° and 69°, 10 days between 50° and 59°, and 2 days below 50°. On the minimum temperature
frequency side of things, there were 6 days between 30° and 39°, 11 days between 40° and 49°, 3 days
between 50° and 59°, 8 days between 60° and 69° and 3 days above 70°. The coolest daily max
temperature was 47.1° on the 26th with the warmest daily min temp of 70.3° on the 8th and 9th.

The diurnal range daily monthly average was 14.2°. Our greatest daily range of temperature was a
comfortable 25.7° on the 23rd, formed from a high of 66.7° and the low of 41.0°. We had a total
of 6 days with daily ranges at or above 20.0°. Our lowest range of temperature was 4.5° (50.1°-46.5°)
on the 27th during the aforementioned nor’easter I had. There were 4 total days with diurnal temperature
ranges of less than 10.0°, mostly during the nor’easter. The generally drier days helped expand our diurnal
ranges somewhat from the low values of a wetter September.

Fortunately I had no more power (battery) problems with my VP2 weather station as I did in September.
I am still 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. I have begun to prepare
my outside components for the winter, such as removal of the inner cylinder and funnel to aide in collecting
snow and other freezing precipitation types. 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.

OCTOBER 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 65.9°
Average low temperature 51.8°
Mean temperature 58.9°

Precipitation 2.63″ (- 0.77”) (long-term PRISM normals)
Greatest daily amount (date) 0.91″ (11)
Greatest storm total (dates) 1.24” (26-28)
2018 year-to-date precipitation total 51.05″

High temperature for the month (date) 85.6° (4)
Low temperature for the month (date) 33.7° (22)

Highest barometric pressure (date) 30.46” (18)
Lowest barometric pressure (date) 29.52” (11,12)

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

Heating degree days for the month: 281
Cooling degree days for the month: 90

Greatest diurnal range (date): 25.7° (23)
Least diurnal range (date) 4.5° (27)

Number of days:

Fog 9
Windy 7
Thunder 1
Cloudy 8
Partly Cloudy 14
Sunny/Clear 9
Max temp ≥ 80° = 8
Min temp < 40°= 9
Precip ≥ 0.01” = 9