Friday, April 25, 2025

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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

FRIDAY, APRIL 25, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0447E
SUNSET: 1837E

EARLY MORNING SPOTTY RAIN MAKES WAY FOR SUNSHINE AND
CONTINUED WARMING TEMPERATURES THIS AFTERNOON….

This morning featured mostly overcast conditions with rain
in the area, though we only netted a trace of precipitation
during the early morning hours. This puts us -1.02 inches in
deficit for the month and -4.33 inches for the year to date. The
humid air has brought some warm temperatures to Blue Hill, and
by the afternoon the skies cleared enough to have some sunshine,
further increasing the temperature.

Temperatures continue to be unseasonably warm today, with our
high temperatures nearing the 80F mark (78F) by the final 1pm
observation. Our record high is 83F (set in 2009). Dew point
values have also continued to rise, starting at 43F this morning
to a much muggier 51F this afternoon. The humidity in the air has
also impacted our visibility, and coupled with the lower wind
speeds, it has started to feel more like summer.

The wind averaged around 10mph out of the WSW during the early
morning hours, but has slowly started to decrease since about 9am.
We have had a few instances during the late morning where we have
had calm conditions. This has given us an average speed for the
day of around 9mph with a light and variable direction for the most
recent readings. The peak gust of 24mph occurred just after 2am.

As previously mentioned, visibility has been impacted quite a bit
by the early morning virga and then further impacted by the higher
dew point values and high pollen counts. We have struggled to make
it to 20 miles for much of the day, though we were ‘fortunate’ enough
to have about 30 miles of visibility during the early morning.

The maximum temperature for today is 78F degrees, which is 17 degrees
above the normal high of 61F. The minimum temperature since midnight is
52F degrees, which is 10 degrees above the normal low of 42F.

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Today’s Observations:

7 A.M.
Weather: Overcast altocumulus, few stratocumulus, virga distant
WSW-NW-NNE and E-ESE
Temperature: 60F; Dew Point: 43F; Relative Humidity: 53%
Wind: W @ 10 kts
Sea-level pressure: 1023.5 mb; 30.22 in. Hg: rising, then more
rapidly
Visibility: 30 miles
6-hr Max temp: 60F
6-hr Min temp: 52F
24-hr Precip: Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E100 OVC 30 235/60/43/2610/022/ FEW SC ALQDS VIRGA DSNT
WSW-NW-NNE AND E-ESE RW-B30E45/ 8/57/ 53011 6000/ 70000 10060 20052

10 A.M.
Weather: Overcast altostratus/altocumulus, few stratocumulus
Temperature: 66F; Dew Point: 49F; Relative Humidity: 53%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1024.1 mb; 30.34 in. Hg: rising steadily
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E95 OVC 20 241/66/49/2905/024/ FEW SC ALQDS HAZY WND LGT/
8/57/ 52006

1 P.M.
Weather: Scattered cirrostratus, scattered altocumulus, few cumulus
all quadrants
Temperature: 77F Dew Point: 51F; Relative Humidity: 40%
Wind: SSW @ 3 kts, wind light and variable
Sea-level pressure: 1022.0 mb; 30.18 in. Hg: falling, then more slowly
Visibility: 20 miles, hazy
6-hr Max temp: 78F
6-hr Min temp: 60F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 150 SCT 220 SCT 20 220/77/51/1903/018/ FEW CU ALQDS HAZY
WND L/V/ 8/156 56021 10078 20060

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SUMMARY FOR THURSDAY, APRIL 24, 2025

TEMPERATURE (DEGREES F)
MAX…….74 NORMAL…..60
MIN…….45 NORMAL…..41
MEAN……60 NORMAL…..51

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+9
TOTAL DEPARTURE FOR THE MONTH………………………+27 [+0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..5 DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH……………433 DEPARTURE…….-28
TOTAL HEATING UNITS FOR THE SEASON………….5362 DEPARTURE……-446
TOTAL HEATING UNITS LAST SEASON TO DATE……..5073 DEPARTURE……+289

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………..2 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE SEASON…………….2 DEPARTURE……..+1
TOTAL COOLING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+2

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)………..31 S @ 04:20 P.M.
VECTOR #1 (1-Sec)……….31 S @ 04:20 P.M.
VECTOR #2 (1-Sec)……….29 SSW @ 05:02 P.M.
DAVIS #1……………….33 S @ 04:20 P.M.
DAVIS #2 ………………36 S @ 04:14 P.M.
RMY #1 (Instantaneous)…..30 S @ 04:20 P.M.
RMY #2 (Instantaneous)…..30 SSW @ 05:02 P.M.
MERLIN…………………28 S
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 S @ 04:22 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 04:22 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 05:04 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 S @ 05:03 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 S @ 04:22 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 S @ 04:22 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 S @ 05:04 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.1 SSW [242 total miles] VECTOR #1………………10.3
VECTOR #2………………10.3
DAVIS #1……………….10.3 SSE
DAVIS #2……………….10.4 SSE
RMY #1…………………10.0 S
RMY #2…………………10.4 SSE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..2.88 DEPARTURE…..-1.02
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.59 DEPARTURE…..-4.33

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-1.0
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.8

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PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY: R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data

4/1 55/32/44/+3/0.17/0.0/512/67 38 NW VEC1 38 NW RMY 40
4/2 42/27/35/-6/0.11/T/584/76 29 NNW VEC1 28 NNW RMY 29
4/3 62/32/47/+5/0.31/0.0/000/00 38 SW VEC1 38 SW RMY 39
4/4 69/47/58/+16/0.00/0.0/456/59 31 NW VEC1 31 NW RMY 30
4/5 47/36/42/-1/0.49/0.0/000/00 25 ESE VEC1 29 SE RMY 25
4/6 51/37/44/+1/0.20/0.0/016/02 22 NNW VEC1 21 NNW RMY 21
4/7 45/34/40/-4/0.18/T/000/00 24 E VEC1 23 NNE RMY 23
4/8 40/26/33/-11/0.10/0.1/196/25 51 W VEC1 48 W RMY 51
4/9 46/24/35/-9/0.00/0.0/755/96 36 WNW VEC1 33 NW RMY 36
4/10 49/29/39/-6/0.01/0.0/569/72 23 SSW VEC1 23 SSW RMY 25
4/11 45/31/38/-7/0.39/1.2/024/03 25 ENE VEC1 27 ENE RMY 26
4/12 36/33/35/-11/0.46/0.4/000/00 39 ENE VEC1 40 E RMY 42
4/13 42/35/39/-7/0.16/0.0/000/00 38 NE VEC1 38 NE RMY 40
4/14 67/35/51/+4/0.00/0.0/745/93 29 WNW VEC1 29 NNW RMY 28
4/15 66/44/55/+8/0.04/0.0/209/26 53 NW VEC1 51 NW RMY 54 TSTM
4/16 51/37/44/-3/T/0.0/484/60 44 WNW VEC1 43 WNW RMY 47
4/17 59/35/47/-1/0.00/0.0/800/99 35 WNW VEC1 34 WNW RMY 34
4/18 66/38/54/+4/0.00/0.0/617/76 41 SSW VEC1 42 SSW RMY 43
4/19 82/52/67/+18/T/0.0/383/47 40 WNW VEC1 40 W RMY 40
4/20 67/45/56/+7/0.00/0.0/768/94 53 NW VEC1 54 NW RMY 56
4/21 63/37/50/0/0.00/0.0/566/69 30 SSW VEC1 28 SSW RMY 31
4/22 75/44/60/+10/0.26/0.0/452/55 30 SSW VEC1 30 SSW RMY 30
4/23 72/43/58/+8/0.00/0.0/792/96 24 NW VEC1 23 NW RMY 26
4/24 74/45/60/+9/0.00/0.0/…/.. 31 S VEC1 31 S RMY 30