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

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

September 2018 kept up the patterns of the 2018 summer with warm and wet

conditions most of the month. No really big one-day rains this month, but there

were 5 days with over an inch of rainfall, and a total of 17 days of measurable

rain (which coincidentally was the same amount of cloudy days during the

month). There were two 7 day streaks of measurable rain during the month

(7-13 – 5.43” and 22-28 – 3.69”). Those 2 groups (about half the month)

constituted about 88% of the total monthly precipitation (10.34”). The rainiest

day of the month was on the 7th (1.58”) when a strong front came through

with a thunderstorm, cooling us off from our big early month heat spell.

This heat spell featured 4 straight days with max temps of 90° or more (the

only ones of the month, from the 3rd through the 6th), and also a string of

minimum temperatures of greater than 70° with similar high dew point

temperatures, mostly in the 70s. The nights were particularly oppressive,

especially when looking forward to more pleasant fall temperatures coming

in to the area. All the rain that fell thereafter the rest of the month helped cool

us off a bit, but we still had several humid days.

The highest temperature reached during the month was 90.5° on the 6th

while the lowest temperature in September was 55.5° on the 27th. The

highest dew point temperature reached during the month was 79° during

our early month heat spell on the 3rd while the lowest dew point temperature

value reached during September was 50° on the wet, cool, rainy 27th.

Barometric pressure differences during the month increased a bit over the

previous summer months, with the lowest values found on the 18th, when

29.78” was reached. During that time I was having weather station

connection problems, so several readings (but not the barometric

readings) had to be estimated from very nearby, trusted weather

observers. September’s pressure extremes included the extreme

highest pressure for the month (30.38”) on the last day of the month

while the extreme lowest (29.78”) was on the 18th. The low reading

matched the low reading in August, ironically. This rainy September

had 17 cloudy days, 9 partly cloudy days, and 4 clear/sunny days.

There were 17 heating degree days and 219 cooling degree days

during the month. There were 14 foggy days, 8 windy days and 5

days 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 about the same as the previous

summer months. My maximum temperature frequencies included 4

days of 90° or greater, 9 days between 80° and 89°, 13 days between

70° and 79°, and 4 days between 60° and 69°. On the minimum

temperature frequency side of things, there were 6 days between 50°

and 59°, 13 days between 60° and 69°, and 11 days at or above 70°.

The coolest daily max temperature was 61.8° on the 23rd with the

warmest daily min temp 74.7° on the 4th.

The diurnal range daily monthly average was only 11.7°. Our greatest

daily range of temperature was 17.5° on the 5th, formed from a high of

90.3° and a steamy low of 73.1°. We had a total of 22 days with daily

ranges at or above 10°. Our lowest range of temperature was 3.2°

(71.3° – 68.1°) on the 11th which was one of our many wet days

during the month. There were 8 total days with diurnal temperature

ranges of less than 10.0°, mostly on cloudy, rainy days. The wet, cloudy

month really muted our diurnal ranges. Normally I get several days

with above a 20° range (at least) and sometimes days with 30° or greater.

I had power (battery) problems with my VP2 weather station several days

mid-month. Several readings (but not rain or pressure) had to be

estimated for about a week (roughly the 12th – 18th) as noted on my

spreadsheet comment entries. 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 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.

SEPTEMBER 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 77.6°
Average low temperature 65.9°
Mean temperature 71.7°

Precipitation 10.34″

(+6.35” – long-term PRISM normals from CoCoRaHS)

Greatest daily amount (date) 1.58″ (7)
Greatest storm total (dates) 3.55” (7-9)
2018 year-to-date precipitation total 48.42″

High temperature for the month (date) 90.5° (6)
Low temperature for the month (date) 55.5° (27)

Highest barometric pressure (date) 30.38” (30)
Lowest barometric pressure (date) 29.78” (18)

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

Heating degree days for the month: 17
Cooling degree days for the month: 219

Greatest diurnal range (date):17.2° (5)
Least diurnal range (date) 3.2° (11)

Number of days:

Fog 14
Windy 8
Thunder 5
Cloudy 17
Partly Cloudy 9
Sunny/Clear 4
Max temp ≥ 90° 4
Min temp < 60° 7
Precip ≥ 0.01” 17


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

AUGUST 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
By Kevin Shaw, Observer in ChargeAugust 2018 was similar in many respects to July. Temperature averages were just about the same,
and both July and August were wet months. In fact, the wettest day of each month both fell on the
21st of the month (4.02” on 7/21, 3.92” on 8/21). August had 6 days with max temps of 90° or
greater and July had 8, but August didn’t have the 5 days in a row heat wave at the beginning of
the month like July did. The biggest difference in temperature issues was minimums of 70° or greater.
July had 11 and August had 21. With global warming, we have been trending to have warmer minimums,
not only in summer but most all months Differences in some patterns between July and August were also
in evidence. The first half of July was very dry, while the first 22 days of August were quite wet.
13 days of measurable rain was pretty close to the normal amount for August and once again compared
favorably with the 12 days in July. It was an incredibly diverse month with Mother Nature turning her
“faucet” on then off.

Once again, significant pressure differences during the month were muted, even more so than in July.
The lack of tropical activity didn’t put a crimp on our rainfall, but didn’t give us very low pressure values
during the month. August’s pressure extremes included the extreme highest pressure for the month
(30.29”) on the 25th with the extreme lowest (29.78”) on the 22nd on the day after our biggest
rain of the month. The month had 10 cloudy days, 13 partly cloudy days, and 8 clear/sunny days.

There were 0 heating degree days and 383 cooling degree days during the month. There were 6 foggy
days and 7 windy days with thunder (mostly all in thunderstorms during our wet periods the first 22
days of 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 also posted on weathertogether.net.

Daily max/min temperatures varied about the same as June. My maximum temperature frequencies
included 6 days of 90° or greater, 20 days between 80° and 89°, and 5 days between 70° and 79°.
On the minimum temperature frequency side of things, there was 1 day between 50° and 59.9°,
10 days between 60° and 69.9°, and 20 days at or above 70°. The coolest daily max temperature
was 77.0° on the 23rd with the warmest daily min temp 76.1° on the 16th.

The diurnal range daily monthly average was 15.2°. Our greatest daily range of temperature was
21.9° on the 24th, formed from a high of 80.7° and the monthly low of 58.8°. We had only a
total of 3 days with daily ranges at or above 20°. Our lowest range of temperature was 6.7°
(77.4°-70.7°) on the wettest day of the month on the 21st. There were only 2 other days with
diurnal temperature ranges less than 10.0°, on cloudy, but not particularly wet days.

A recent change to the station was replacing the circuit board for the ISS on my VP2 weather
station, as I had some down time during the month due to system problems. Unfortunately the
development mentioned in my July report of the sprinkler system has persisted in adding
un-natural amounts of water accumulation to my tipping bucket totals in the very early morning
hours. With the coming of fall and winter and the end of the growing season, the sprinklers
should not be running much longer. The cocorahs gauge, located off property in a different
location, does not get this “artificial input” to its official record. I am still constantly checking
on my data quality frequently (which caused me to discover the sprinkler system problem),
along with discussion and data comparison with several of my Maryland weather cohorts.

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.

AUGUST 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 85.0°
Average low temperature 69.8°
Mean temperature 77.4°

Precipitation 7.67″
Greatest daily amount (date) 3.92″ (21)
Greatest storm total (dates) 4.06” (21-22)
2018 year-to-date precipitation total 38.08″

High temperature for the month (date) 91.9° (29)
Low temperature for the month (date) 58.8° (24)

Highest barometric pressure (date) 30.29” (25)
Lowest barometric pressure (date) 29.78” (22)

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

Heating degree days for the month: 0
Cooling degree days for the month: 383

Greatest diurnal range (date): 21.9° (24)
Least diurnal range (date) 6.7° (21)

Number of days:

Fog 6
Windy 7
Thunder 7
Cloudy 10
Partly Cloudy 13
Sunny/Clear 8
Max temp ≥ 90° 6
Min temp < 60° 1
Precip ≥ 0.01” 13 J

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Stewartsville August 2018 Monthly Summary

Stewartsville 2018 Weather Data

The month of August is in the book and I’m glad to say goodbye. While the rainfall was nice, it was too much all at once. And no tropical systems to blame!

And then there’s the humidity. Even I had some bad hair days!

Of note is the number of days where our low temperature did not fall below 70. Now that’s sticky and muggy and downright uncomfortable. An AccuWeather meteorologist did a brief study on this looking at ABE’s data and found it well above recent normal.

I for one am looking forward to cooler fall like weather…

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

JULY 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
By Kevin Shaw, Observer in Charge

July 2018 was a tale of two distinct, different patterns. The first 16 days of the month was hot and dry
(all 8 days of 90° maxs or higher, only 0.15″ of rain) while the last 15 days of the month were cooler and
very wet (over 98% of the month’s total rainfall, 3 days with maxs in the 70s, none in the nineties). The
highlight was the 4.02″ of rain that fell on the 21st, the wettest day of the month, year, and of my brief
station’s history. That kicked off a 5 day streak of heavy rains totaling 6.43″ that led to some area-wide
flooding and very soggy trips to the rain gauge. The big hot spell during the first half of the month was
highlighted by the heat wave streak the first 5 days of the month topped off by the 95.8° high on the
second, hottest reading of the month. The minimums were high most of the month, with 11 days of 70
or greater lows. The rainy period towards the end of the month also had some, with low diurnal ranges,
topped off with the 5.8° range on the 24th (78.6° – 72.8°).. 12 days of measurable rain was pretty close
to the normal amount for July. It was an incredibly diverse month with Mother Nature turning her “faucet”
off then on.

Once again, significant pressure differences during the month were muted, though not as much as June.
The lack of tropical activity didn’t put a crimp on our rainfall, but didn’t give us a very low pressure value
during the month. July’s pressure extremes included the extreme highest pressure for the month (30.39”
on the 8th) and the extreme lowest (29.66” on the 22nd). The month had 8 cloudy days, 15 partly cloudy
days, and 8 clear/sunny days.

There were 0 heating degree days and 382 cooling degree days during the month. There were only 5 foggy
days, but 7 days with thunder and 4 windy days (all in thunderstorms during our wet second half of 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 also posted on weathertogether.net.

Daily max/min temperatures varied about the same as June. My maximum temperature frequencies included
8 days of 90° or greater, 18 days between 80° and 89°, and 5 days between 70° and 79°. On the minimum
temperature frequency side of things, there were 2 days between 50° and 59.9°, 18 days between 60° and
69.9°, and 11 days at or above 70°. The coolest daily max temperature was 73.6° on the very wet 21st
and the warmest daily min temp was 76.6° in the middle of the month’s longest heat wave on the 3rd.

The diurnal range daily monthly average was 17.1°. Our greatest daily range of temperature was 28.3° on the
9th, formed from a high of 87.3° and the monthly low of 59.0° as I was ramping up from a cool period to one
of our 90° max temps on the 10th. We had a total of 9 days with daily ranges above 20°. Our lowest range
of temperature was 5.8° (78.6°-72.8°) on the cloudy, wet 24th. There were only 2 other days with diurnal
temperature ranges less than 10.0°, on cloudy, but not particularly rainy days.

Recent changes to the station include a new base to the VP2 weather station, as the old one shifted too easily
and became slanted which can throw off the rainfall catch. Helping out is also a screen added to cover over
the small hole at the bottom of the gauge cone that will keep out pollen and leaf and twig litter, particularly pine
needles from the close by pine tree. Unfortunately a new development is adding un-natural amounts of water
accumulation to my tipping bucket totals, as the apartment complex automatic sprinkler system kicks off on
most days between 0300-0330 (usually adding between 0.03” and 0.06” to the day’s total). The cocorahs
gauge, located off property in a different location, does not get this artificial input to its official record. I am still
constantly checking on my data quality frequently (which caused me to discover the sprinkler system problem),
along with discussion and data comparison with several of my Maryland weather cohorts. 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.

JULY 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 85.9°
Average low temperature 68.8°
Mean temperature 77.3°

Precipitation 8.14″
Greatest daily amount (date) 4.02″ (21)
Greatest storm total (dates) 6.43” (21-25)
2018 year-to-date precipitation total 30.41″

High temperature for the month (date) 95.8° (2)
Low temperature for the month (date) 59.0° (9)

Highest barometric pressure (date) 30.39” (8)
Lowest barometric pressure (date) 29.66” (22)

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

Heating degree days for the month: 0
Cooling degree days for the month: 382

Greatest diurnal range (date): 28.3° (9)
Least diurnal range (date) 5.8° (24)

Number of days:

Fog 5
Windy 4
Thunder 7
Cloudy 8
Partly Cloudy 15
Sunny/Clear 8
Max temp ≥ 90° 8
Min temp < 60° 2
Precip ≥ 0.01” 12

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

JUNE 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
By Kevin Shaw, Observer in Charge

June 2018 featured near normal rainfall and temperatures at my station, extrapolated from statistics compiled
at the three major airports in the DC area and published in the June NWS PRESTO report. There were a few
short hot spells with max temps of 90 or more (18th-19th and 29th-30th) but generally pleasantly cool temps
most of the days of the first half of the month (7 days with maximum temperatures less than 80° with 1 day
in the 60s) .Many of these cooler days (as is so common during the summer months) were cloudy, rainy days.
The highest temperature of the month was 93.7° on June 18, and the coolest was 54.2° just six days earlier
on the 12th. There were no really notable heavy precipitation days, just a lot of moderate amounts, topped by
the 0.93” on the 3rd, 0.82” on the 19th and 0.76” on the 2nd. A moderately wet period occurred from June
19 through the 24th during which 1.49” fell. There were 13 days with measurable precipitation, probably roughly
a normal amount for June.

As we approach the summer months, significant pressure differences become less important because among other
things they go away, unless we get some significant tropical activity with the usual low pressure associated with
tropical storms and/or hurricanes. June continued the trend started in May as the extreme highest pressure for
the month (30.25” on the 12th) and the extreme lowest (29.70” on the 5th) were once again rather muted. The
month had 11 cloudy days, 11 partly cloudy days, and 8 clear/sunny days.

There were 5 heating degree days and 248 cooling degree days during the month. There were only 4 foggy days,
only 2 days with thunder and 2 windy days (mostly during intense rain events). 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 also
posted on weathertogether.net.

Daily max/min temperatures varied less during June compared with May. My maximum temperature frequencies
included 4 days of 90° or greater, 14 days between 80° and 89°, 11 days between 70° and 79°, and 1 day
between 60° and 69°. On the minimum temperature frequency side of things, there were 8 days between 50°
and 59°, 16 days between 60° and 69°, and 6 days at or above 70°. The coldest daily max temperature was
64.8° on the 11th and the warmest daily min temp was 73.4° on the 19th.

The diurnal range daily monthly average was 17.2°. Our greatest daily range of temperature was 25.9° on the 16th,
formed from a high of 85.9° and low of 60.0° as I was ramping up from a cooler period to one of our brief “heat
spells” of the month. We had a total of 9 days with daily ranges above 20°. Our lowest range of temperature was
7.1° (64.8°-57.7°) on the cloudy, wet 11th – our coolest day of the month. There were only 2 other days with
diurnal temperature ranges less than 10.0°, once again on cloudy, rainy days.

Recent changes to the station include a new base to the VP2 weather station, as the old one shifted too easily and
became slanted which can throw off the rainfall catch. Helping out is also a screen added to cover over the small
hole at the bottom of the gauge cone that will keep out pollen and leaf and twig litter, particularly pine needles from
the closeby pine tree. Unfortunately despite trimming some of the pine tree branches, the pine tree is still causing
excessive blowoff into the gauge, elevating the rainfall readings frequently compared to my official cocorahs rain
gauge. I am still constantly checking on my data quality frequently along with some of my Maryland weather cohorts.
I just added lightning detection equipment to my instrument arsenal.. 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.

JUNE 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 81.7°
Average low temperature 64.5°
Mean temperature 73.1°

Precipitation 3.77″
Greatest daily amount (date) 0.93″ (3)
Greatest storm total (dates) 1.69” (2-3)
2018 year-to-date precipitation total 22.27″

High temperature for the month (date) 93.7° (18)
Low temperature for the month (date) 54.2° (12)

Highest barometric pressure (date) 30.25” (12)
Lowest barometric pressure (date) 29.70” (5)

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

Heating degree days for the month: 5
Cooling degree days for the month: 248

Greatest diurnal range (date): 25.9° (16)
Least diurnal range (date): 7.1° (11)

Number of days:

Fog 4
Windy 2
Thunder 2
Cloudy 11
Partly Cloudy 11
Sunny/Clear 8
Max temp ≥ 90° 4
Min temp < 60° 8
Precip ≥ 0.01” 13

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

MAY 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND
By Kevin Shaw, Observer in Charge

May 2018 featured significantly above normal rainfall and temperatures in the region, based on statistics compiled
at the three major airports in the DC area and in general corroboration with my own statistics. There were generally
warm temperatures all month except for 5 days in the 60s during some of our 16 rainy days during the month.
Most of the warm days were in the 80s, save for 2 days near the beginning of the month that just tipped over the
90° mark. Extremes in temperature were quite muted this month. The highest temperature of the month was 90.5°
on May 3, and the coolest was 46.4° just two days earlier on the 1st. There were no really notable heavy
precipitation days, just a lot of moderate amounts, topped by the 4 days of just over an inch during the month
(The 1.13” total on the 15th was the greatest daily amount for the month). A particularly wet period (May 13-19)
occurred with 7 straight days of measurable precipitation totaling 4.77” and was about 67% of the total monthly amount
(6.68”) for May 2018. There were 16 days with measurable precipitation, assuredly well above the normal amount.

As we approach the summer months, significant pressure differences become less important because, among other things,
they go away, unless we get some significant tropical activity with the usual low pressure associated with tropical storms
and/or hurricanes. May started to show this pattern as the extreme highest pressure for the month (30.25” on the 8th)
and the extreme lowest (29.80” on the 10th) weren’t nearly as large apart as in the colder months. But please note that
the extreme values still exhibit the seemingly usual pattern of not being very far apart in days. The month had 13 cloudy
days, 10 partly cloudy days, and 8 clear/sunny days.

There were only 16 heating degree days and 174 cooling degree days during the month. There were 11 foggy days, 7
days with thunder and 6 windy days (mostly from thunderstorms). 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 also posted
on weathertogether.net.

Daily max/min temperatures varied less than April throughout May. My maximum temperature frequencies included 2
days of 90° or greater, 16 days between 80° and 89°, 8 days between 70° and 79°, and 5 days between 60° and
69°. On the minimum temperature frequency side of things, there was 1 day between 40° and 49°, 11 days between
50° and 59°, 17 days between 60° and 69°, and 2 days at or above 70°. The coldest daily max temperature was
66.7° on the 18th and the warmest daily min temp was 71.9° on the 26th.

The diurnal range daily monthly average was 18.6°. Our greatest daily range of temperature was 35.8° on the 2nd°,
formed from a high of 87.8° and low of 52.0° as I was in short transition between the coldest and warmest
temperatures of the month on the 1st and 3rd. We had one more day with a range over 30° (33.2° on the 1st)
and an additional 10 days with daily ranges above 20°. Our lowest range of temperature was 3.6° (67.7°-64.1°)
on the 17th. It was one of our cloudy, rainy days of the month. There were 4 other days with diurnal temperature
ranges less than 10.0°, mostly on cloudy, rainy days.

With yet another month to study the most recent instrument changes made in mid-August, data appears to be stable
and an overall data quality improvement success. I am still constantly checking on my data quality frequently along with
some of my Maryland weather cohorts. I am about to add a lightning detection component to my system. I had problems
with pollen clogging my tipping bucket gauge during May, which inhibited my capacity for adding precipitation timing and
max rain rates to my daily records. I also have continued as close to daily (as time allows) GLOBE Cloud observations,
complete with submission of sky pictures at the time of the observation, usually timed with the passage of satellites and
also 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.

MAY 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 79.4°
Average low temperature 60.8°
Mean temperature 70.1°

Precipitation 6.68″
Greatest daily amount (date) 1.13″ (15)
Greatest storm total (dates) 4.77” (13-19)
2018 year-to-date precipitation total 18.50″

High temperature for the month (date) 90.5° (3)
Low temperature for the month (date) 46.4° (1)

Highest barometric pressure (date) 30.25” (8)
Lowest barometric pressure (date) 29.80” (10)

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

Heating degree days for the month: 16
Cooling degree days for the month: 174

Greatest diurnal range (date): 35.8° (2)
Least diurnal range (date): 3.6° (17)

Number of days:

Fog 11
Windy 6
Thunder 7
Cloudy 13
Partly Cloudy 10
Sunny/Clear 8
Max temp ≥ 90° 2
Min temp ≤ 32° 0
Precip ≥ 0.01” 16

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NJWO June 2018 Meeting with Joe Cioffi!

The NJWO had their June 2018 meeting last night and enjoyed a presentation from Meteorologist Joe Cioffi via Skype and YouTube! Despite some technical issues here and there the meeting was enjoyed by all who attended. Joe gave his usual weather overview and well as a look ahead.

Joe not only posts regularly to YouTube but to his Facebook page as well. Check him out!

Janet clears off the tree pollen for our outdoor meeting!

NJWO members enjoying a remote session with Joe Cioffi outdoors!

NJWO members enjoying a remote session with Joe Cioffi outdoors!

NJWO members enjoying a remote session with Joe Cioffi outdoors!

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APRIL 2018 MONTHLY SUMMARY AND CLIMATE STATISTICS FOR ROCKVILLE 2.8 WNW MARYLAND FOR THE NJWO BLOG

APRIL 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND

By Kevin Shaw, Observer in Charge

April 2018 featured a bit above normal rainfall and below normal temperatures at the three major airports in the DC area. There were generally cool temperatures all month except for a brief 2 day mini-heat wave on the 13th and 14th when I had maximum temperatures in the 80s and lows in the 60s. The 84° high was the highest temperature of the month. Just a few days before I had my coldest max temperature readings in the 40s on the 8th and 9th, with a 42° max on the 9th the coldest max of the month. The coldest min temperature of the month (31°) occurred on the 8th. It was the only freezing minimum of the month, though many other days were close in the 33°-34° range. Another cold day with high winds was on the 17th, following our biggest storm of the month and the lowest barometric pressure (29.47”) on the 16th. The 2.22” total on the 16th was about 62% of the monthly amount (3.57”) and so far the wettest day of the year at my station. There were 10 days with measurable precipitation, probably about the normal amount. The modest highest barometric pressure reading of the month (30.51″) on the 21st was in a brief 4 day dry period at that time. The month was mostly partly cloudy (12 days) to cloudy (13 days) with only 5 clear days (same as March).

There were 398 heating degree days (HDD) and 17 cooling degree days (CDD) during the month. There were 7 foggy days, unfortunately no days with snow (including trace amounts), 3 windy days and 2 days with thunder. The windy day category is subjective with no personal real data values to back it, just based on my email daily weather posts that are also posted on weathertogether.net. A 52 MPH gust was recorded on the 19th at a nearby Gaithersburg station, according to the April PRESTO summary.

Daily max/min temperatures varied more widely than March throughout April. My maximum temperature frequencies included 2 days over 80°, 3 days between 70° and 79°, 11 days between 60° and 69°, 11 days between 50° and 59°, and 3 days between 40° and 49°, On the minimum temperature frequency side of things, there were 12 days between 30° and 39°, 12 days between 40° and 49°, 3 days between 50° and 59°, and 2 days at or above 60°. The coldest daily max temperature was 42.4° on the 9th and the warmest daily min temp was 64.6° on the 14th.

The diurnal range daily monthly average was 18.5°. Our greatest daily range of temperature was 31.1° on the 12th°, formed from a high of 75.3° and low of 44.2° as I was ramping into our brief 2 day mini-heat wave over the following 2 days. We had one more day with a range over 30° (30.6° on the 30th) and an additional 10 days with daily ranges above 20°. Our lowest range of temperature was 6.3° (44.2°-37.9°) on the 17th. It was on the cloudy, blustery, chilly day after our big rainstorm on the 16th. There were 5 other days with diurnal temperature ranges less than 10.0°. The distribution of both the low and high diurnal range days were spread fairly evenly throughout the month ..

With yet another month to study the most recent instrument changes made in mid-August, data appears to be stable and an overall data quality improvement success. I am still constantly checking on my data quality frequently along with some of my Maryland weather cohorts. I did bring in my snowboard by the end of the month. I intended on bringing it in earlier in the month, but actual snow threats during the first part of the month delayed the snowboard removal. My rain gauge has been restored to fully operational mode, with both the inner and outer cylinders and the funnel in place. I also have continued as close to daily (as time allows) GLOBE Cloud observations, complete with submission of sky pictures at the time of the observation, usually timed with the passage of satellites and also solar noon right now with the time change 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.

APRIL 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 61.5°

Average low temperature 43.0°

Mean temperature 52.3°

Precipitation 3.57″

Greatest daily amount (date) 2.22″ (16)

Greatest storm total (dates) 2.25” (15-16)

2018 year-to-date precipitation total 11.82″

Snow 0.0″

Seasonal snowfall total as of 4/30/2018 11.7″

High temperature for the month (date) 83.9° (13)

Low temperature for the month (date) 31.1° (8)

Highest barometric pressure (date) 30.51” (21)

Lowest barometric pressure (date) 29.47” (16)

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

Heating degree days for the month: 398

Cooling degree days for the month: 17

Greatest diurnal range (date): 31.1° (12)

Least diurnal range (date) 6.3° (17)

Number of days:

Fog 7

Windy 3

Thunder 2

Cloudy 13

Partly Cloudy 12

Sunny/Clear 5

Max temp ≥ 80° 2

Min temp ≤ 32° 1

Precip ≥ 0.01” 10

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2018 Tropical Storm Names

2018 tropical storm names for Atlantic

With the warmer weather comes the potential of tropical systems. The official Hurricane season starts June 1. Above are the list of names for the Atlantic basin for 2018

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March 2018 Monthly summary and statistics for the NJWO Blog – Kevin Shaw, Rockville 2.8 WNW Maryland Observer

MARCH 2018 MONTHLY SUMMARY ROCKVILLE 2.8 WNW MARYLAND

By Kevin Shaw, Observer in Charge

March 2018 turned the tables on our really warm February, so much so that I actually averaged colder in March by about 3° than February. While we were drier in March, because of the colder temps we got more snow in March than in February. There were only 12 days in February with minimum temperatures at or below freezing, in March there were 22, including a streak of 19 straight (from March 8 through March 26 – using rounded values to the nearest degree) While we had a grand snowfall total of 4.5”, 3.4” of it fell on the first day of spring on March 21, along with our coldest maximum temperature for the month of 33.1°. Precipitation was significantly below normal at the three major Baltimore/Washington airports. Our biggest storm was associated with the biggest snowfall, as 1.01” fell on the 2 day period (March 20-21). There were only 8 days with measurable precipitation, assuredly somewhat below normal I am sure, with an additional 3 days with trace amounts. The highest barometric pressure reading of the month (30.72″) on the 26th was in the middle of our month’s longest dry streak. The lowest barometric pressure reading of the month (29.45″) occurred on the 1st day of the month, during a 2 day stormy period kind of leftover from late February. The month was mostly partly cloudy (16 days) to go along with the subnormal precipitation, with only 5 clear days logged along with 10 cloudy days. The month was generally cool to cold, save for the brief warm spell at the end of the month, which followed our highest barometric pressure days.

There were 773 heating degree days (HDD) and 0 cooling degree days (CDD) during the month. There were 5 foggy days, 7 days with snow (including trace amounts), and 10 windy days. That is a subjective category with no real data values to back it, just based on my email daily weather posts that are also posted on weathertogether.net. There were 2 days with sleet and 1 day with glaze (both occurred on the 21st mixed in with our biggest monthly snowfall during the month with sleet also recorded on the 20th, the day before) .

Daily max/min temperatures varied a bit less widely throughout the month. My maximum temperature frequencies included 2 days over 70°, 0 days between 60° and 69°, 5 days between 50° and 59°, 22 days between 40° and 49°, and 2 days between 30° and 39°.. On the minimum temperature frequency side of things, 7 days between 20° and 29°, 20 days between 30° and 39°, and 4 days between 40° and 49°. The coldest daily max temperature was 33.1° on the snowy 21st (coldest min however, was 26.8° on the 11th) and the warmest daily min temp was 47.1° on that warmest day on the 29th (74.1°).

The diurnal range daily monthly average was 15.3°. Our greatest daily range of temperature was 28.6°, formed from a high of 71.8° and low of 43.2° on the 30th during the brief warm spell at the end of the month.. We only had an additional 4 days with daily ranges above 20°. Our lowest range of temperature was 3.3° on our snowiest (3.4”) day of the month (21st) when our readings (33.1° and 29.8°) teetered around the freezing mark. There were only 2 other days with diurnal temperature ranges less than 10.0°, a decrease of 6 over last month. The distribution of the low diurnal range days was spread randomly throughout the month whereas the highest diurnal range days occurred around the middle and end of the month.

With yet another month to study the most recent instrument changes made in mid-August, data appears to be stable and an overall data quality improvement success. I am still constantly checking on my data quality frequently along with some of my Maryland weather cohorts. I have been swapping out gauges when frozen precipitation occurs to allow for casual, comfortable melting inside my apartment. Despite the late blooming spring, I think the snow measuring season is finally behind us and I need to bring my snowboard in. My rain gauge has been restored to fully operational mode, with both the inner and outer cylinders and the funnel in place. I also have continued as close to daily (as time allows) GLOBE Cloud observations, complete with submission of sky pictures at the time of the observation, usually timed with the passage of satellites and also solar noon right now with the time change 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.

MARCH 2018 – ROCKVILLE 2.8 WNW MARYLAND – SUMMARY STATISTICS

Average high temperature 47.7°

Average low temperature 32.4°

Mean temperature 40.1°

Precipitation 1.62″

Greatest daily amount (date) 0.69″ (20)

Snow 4.5″

Greatest daily amount (date) 3.4” (21)

2018 year-to-date precipitation total 8.25″

Seasonal snowfall total as of 2/28/2018 11.7″

High temperature for the month (date) 74.3° (29)

Low temperature for the month (date) 26.8° (11)

Highest barometric pressure (date) 30.72” (26)

Lowest barometric pressure (date) 29.45” (1)

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

Heating degree days for the month: 773

Cooling degree days for the month: 0

Greatest diurnal range (date): 28.6° (30)

Least diurnal range (date) 3.3° (21)

Number of days:

Fog 5

Windy 10

Snow 7

Cloudy 10

Partly Cloudy 16

Sunny/Clear 5

Max temp ≥ 70° 2

Min temp ≤ 32° 22

Max temp ≤ 32° 0

Precip ≥ 0.01” 8

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