APRIL 2020 MONTHLY WEATHER SUMMARY AND STATISTICS FOR WEST ROCKVILLE MARYLAND FOR THE NJWO BLOG

APRIL 2020 MONTHLY SUMMARY

ROCKVILLE 2.8 WNW MARYLAND

by Kevin Shaw, Observer

April 2020 was cooler and wetter than normal.
My maximum temperature average (61.9°) was
3.4° below normal but my minimum temperature
average (43.6°) was still a bit above normal (+0.7°),
resulting in the mean temperature average of 52.8°
to be 1.3° below normal. My total precipitation of
6.79″ was 3.50” above the normal March value for
my station of 3.29”. There were 17 days with
measurable precipitation, distributed fairly evenly
throughout the month but with the maximum amounts
in the middle and end of the month. . There were
two very wet days, the greatest daily amount of
2.89” fell on the 13th, with 1.34” falling on the
last day of the month. Those two days (4.23”)
daily values accounted for about 62% of the
monthly precipitation total. Unfortunately no snow
fell during the entire month, effectively ending
the 2019-2020 snow season with a meager total
of 3.0 inches falling the entire winter.

There were several chilly periods during the month,
roughly coinciding with the month’s frequent rainy
periods. The largest, most comprehensive period of
cool max temperatures was between the 14th and
28th (57.6° average). Six of the 9 total 30s
minimum temperature days also occurred during
this period. Seven days (including 4 in a row
between the 5th and the 8th) featured the only
days with maximum values in the 70s, highlighted
by the highest reading of the month of 76.2°
on the stormy 13th.

Severe weather consisted of 4 days with winds
gusting over 50 MPH (9-10, 13, 21) and a severe
thunderstorm with the highest PWG of the month
(62 MPH at 1412 during the height of the storm)
and flooding rains that fell horizontally at times.
It was literally a blizzard of rain !! There was a
total of 13 days with a PWG of 30 MPH or
greater, while the average monthly daily PWG
was 29!!

The highest dew point temperature reached during
the month (the stormy 13th) was 70°, also the
warmest and wettest day of the month. Only two
other days during the month had 60° max daily
dew points, on the 8th and the very wet 30th.
The lowest dew point temperature value was
reached on the 22nd with an 18° reading, which
coincided with my lowest relative humidity
percentage value of the month (23%). With
the frequent rains throughout the month, fire
danger was minimal the entire month.

April had 12 cloudy days, 14 partly cloudy days,
and only 4 clear/sunny days. There were 367
heating degree days and 0 cooling degree days
during the month. There were 9 foggy days, 13
windy days, and 2 days with thunder.

My maximum temperature frequencies included
7 days between 70° and 79°, 11 days between
60° and 69°, 11 days between 50° and 59°,
and one in the 40s. On the minimum temperature
frequency side of things, there was 9 days in the
30s, 14 days between 40° and 49°, and 7 days
of 50° or above. The coldest daily maximum
temperature day was 49.4° on the 10th while
the warmest daily minimum temperature day of
55.2° was reached on the 8th.

The diurnal range daily monthly average was 18.4°
(- 4.0°). Our greatest daily range of temperature
was 28.6° on the 19th (63.0°- 34.4°). We had a
total of 16 days with daily ranges above 20°. Our
lowest range of temperature was 6.4° on the
somewhat rainy and cloudy 24th (56.9°- 50.5°).
There were a total of 5 days with diurnal
temperature ranges of less than 10° during the
month, one more than in March.

April 2020 finished up a virtually snowless and quite
mild 2019-2020 meteorological winter/early spring
period. There were some close calls with a few days
of flurries in the region but nothing observed at my
location. My meager seasonal snowfall of 3.0” was
quite depressing and probably about 15% of normal.
There never was any real ice formation on local
ponds.

My new Davis Vantage Vue console will be installed
as soon as the all-clear travel ban is lifted. I have
been using Marty’s spare VP2 console with no
problems over the past few months. I also need to
do a firmware update on the weatherlink software
along with ithe installation of my new Dell computer,
which needs to get my Thunderbird email program
loaded on to. I am not sure where Marty and I can
find the time to do all this and much more, especially
with this current coronavirus pandemic we are under.
All OK on that “front” here right now thank goodness,
and hope it is on your end too! I am still actively
sheltering in place these days as I am sure you all
are doing also.

APRIL 2020 – ROCKVILLE 2.8 WNW MARYLAND

SUMMARY STATISTICS

Average high temperature 61.9° (- 3.4°)
Average low temperature 43.6° (+ 0.7°)
Mean temperature 52.8° (- 1.3°)

Precipitation 6.79″ (+ 3.50“)
Greatest daily amount (date) 2.89″ (13)
Greatest storm total (dates) 3.37” (12-15)
2020 year-to-date precipitation total 15.69″ (+ 3.00”)

Total monthly snowfall 0.0”
Seasonal snowfall 3.0”

High temperature for the month (date) 76.4° (13)
Low temperature for the month (date) 33.7° (17)

Highest barometric pressure (date) 30.34” (17)
Lowest barometric pressure (date) 29.28” (9)

Peak wind gust (date/direction): 62 (13 from the NW)
(USG data across the street)

Heating degree days for the month: 367
Cooling degree days for the month: 0

Greatest diurnal range (date): 28.6° (19)
Least diurnal range (date) 6.4° (24)

Number of days:

Fog 9
Windy 13 (PWG => 30 MPH)
Snow 0
Thunder 2
Cloudy 12
Partly Cloudy 14
Sunny/Clear 4
Max temp ≥ 70° 7
Min temp <= 32° 0
Precip ≥ 0.01” 17

About dabourphoto

Professional Photographer www.dabourphotography.com
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