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!
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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.

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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


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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


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Marcella Monthly Data November 2018

Marcella Monthly Data November 2018

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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


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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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