Wednesday, April 9, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, APRIL 9, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0513E
SUNSET: 1819E
SUNSHINE RETURNS WITH DRIER WEATHER, BUT STILL COLD AND BRISK….
Sunshine has finally returned today with clear skies following a
few days of overcast skies with rain, sleet, and snow. However
cold and windy conditions remain today.
Temperatures are quite a bit below normal today with readings
starting the day in the mid 20s, and recovering only to the mid
40s by early this afternoon. The dew point is quite low for this
time of year with values in the teens, indicative of a polar air
mass over the region.
Winds are busy, but the trend has been for decreasing speed as
the day progresses. A mainly west-northwest wind has been averaging
at around 14mph for the day so far. Gusts were reaching over 30mph
for awhile this morning, but as mentioned, the trend has been for
slower speed into this afternoon. The peak gust for the day is
36mph, which occurred just after midnight, and again just before
8am.
Visibility is excellent today with the view around 60-70 miles all
day.
The maximum temperature for today is 44F degrees, which is 9 degrees
below the normal high of 53F. The minimum temperature since midnight
is 24F degrees, which is 11 degrees below the normal low of 35F.
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus all quadrants, few cirrus distant
NNE-ENE
Temperature: 28F; Dew Point: 15F; Relative Humidity: 58%
Wind: WNW @ 15G30 kts, peak wind WNW 36mph at 6:42 A.M.
Sea-level pressure: 1020.7 mb; 30.14 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 28F
6-hr Min temp: 15F
24-hr Precip: 0.05 inches
24-hr Snowfall: 0.1 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 60 207/28/15/3015G30/014/ FEW SC ALQDS FEW CI DSNT
NNE-ENE PK WND 3031/42/ TOTAL NEW SNW PST 24 HRS 0.1 INS/ 8/501
51035 70005 10028 20024
10 A.M.
Weather: Clear, few stratocumulus distant E-SE and distant W-N
Temperature: 35F; Dew Point: 17F; Relative Humidity: 44%
Wind: WNW @ 12G21 kts, peak wind WNW 31mph at 8:57 A.M.
Sea-level pressure: 1022.3 mb; 30.19 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 70 223/35/17/2912G21/019/ FEW SC DSNT E-SE AND DSNT W-N
PK WND 3227/57/ 8/500 51016
1 P.M.
Weather: Clear, few stratocumulus distant all quadrants
Temperature: 44F Dew Point: 15F; Relative Humidity: 31%
Wind: WNW @ 7G14 kts
Sea-level pressure: 1022.9 mb; 30.21 in. Hg: steady, then rising
Visibility: 70 miles
6-hr Max temp: 44F
6-hr Min temp: 28F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 70 229/44/15/3007G14/021/ FEW SC DSNT ALQDS/
8/500 53006 10044 20028
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SUMMARY FOR TUESDAY, APRIL 8, 2025
TEMPERATURE (DEGREES F)
MAX…….40 NORMAL…..53
MIN…….26 NORMAL…..35
MEAN……33 NORMAL…..44
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-11
TOTAL DEPARTURE FOR THE MONTH……………………..+3 [+0.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….32 DEPARTURE…….+11
TOTAL HEATING UNITS FOR THE MONTH……………177 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON………….5106 DEPARTURE……-422
TOTAL HEATING UNITS LAST SEASON TO DATE……..4832 DEPARTURE……+274
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)………..51 W @ 05:06 P.M.
VECTOR #1 (1-Sec)……….48 W @ 05:05 P.M.
VECTOR #2 (1-Sec)……….53 W @ 05:06 P.M.
DAVIS #1……………….49 W @ 05:06 P.M.
DAVIS #2 ………………48 W @ 05:06 P.M.
RMY #1 (Instantaneous)…..51 WNW @ 05:41 P.M.
RMY #2 (Instantaneous)…..53 W @ 05:05 P.M.
MERLIN…………………46 W
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………34 WNW @ 05:15 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..32 @ 04:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..36 @ 07:46 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………35 W @ 04:57 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………36 WNW @ 07:46 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..31 WNW @ 07:46 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..35 WNW @ 07:46 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..13.8 WNW [332 total miles]
VECTOR #1………………13.4
VECTOR #2………………14.7
DAVIS #1……………….13.9 WNW
DAVIS #2……………….14.3 NW
RMY #1…………………12.8 NW
RMY #2…………………14.3 WNW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.05 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..1.56 DEPARTURE…..+0.21
TOTAL PRECIPITATION FOR THE YEAR (2025)…….12.27 DEPARTURE…..-3.10
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.1 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.1 DEPARTURE……-1.3
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.2 DEPARTURE…..-34.1
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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/…/.. 51 W VEC1 48 W RMY 51
4/9 The low since midnight is 24F, the daily normal low is 35F.
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APRIL DAILY RECORDS TO DATE
NONE.
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 9
HIGH 83 IN 1991
LOW 18 IN 1888
PRECIP 2.38 IN. IN 1935
SNOWFALL 11.0 IN. IN 1917
PEAK GUST 72 MPH WNW IN 1962
RECORDS FOR APRIL 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967
TODAY’S REPORT PREPARED BY: Matt Douglas
