Thursday, April 3, 2025

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

THURSDAY, APRIL 3, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0523E
SUNSET:  1813E

MORE RAINFALL OVERNIGHT INTO THIS MORNING, TURNING MILDER TODAY….

Rain, and even a bit of snow and sleet, developed last evening and
continued well into this morning. Rainfall totalled 0.24″ by 7am,
with an additional 0.18″ falling through 1pm. A trace of snow and
sleet will also go in the record book for yesterday’s date.

The rain came to an end finally by late this morning, however
overcast skies remain to this point with brightening taking place
at the 1pm observation.

Despite the clouds, the temperature has warmed well into the 50s by
early this afternoon as a warmer air mass floods in following the
warm frontal passage. The dew point is also rising in tandem, as
such it’s getting more humid out there. This early in the season,
one can notice the “humidity” with dew points in the mid 50s.

Winds have been fairly steady through the day as they gradually
veered from southeast to southwest. The average speed for the day
so far is around 16mph. Gusts over 30mph were common for awhile
early this morning, but has since come down a bit into early this
afternoon. The peak gust for the day so far is 35mph, which occurred
at 7:30am this morning.

Visibility was quite poor this morning with the rain and fog, down
as low as 1/16th of a mile. The view has improved markedly early
this afternoon as we can now see upwards to 30 miles.

The maximum temperature for today is 57F degrees, which is 6 degrees
above the normal high of 51F. The minimum temperature since midnight
is 32F degrees, which is 1 degree below the normal low of 33F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: S @ 15G23 kts
Sea-level pressure: 1022.8 mb; 30.20 in. Hg: falling, then more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 40F
6-hr Min temp: 33F
24-hr Precip:  0.24 inches
24-hr Snowfall: Trace
Snow Depth: 0 inches
BHO SA 1155 X W2 1/16L-F 228/40/40/1715G23/020/ TOTAL NEW SNW PST
24 HRS TRACE/ 8//// 58039 6012/ 70024 10040 20033

10 A.M.
Weather: Overcast stratus, light rain
Temperature: 47F; Dew Point: 47F; Relative Humidity: 100%
Wind: SSW @ 17G28 kts, peak wind SW 33mph at 9:25 A.M.
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: falling, then more slowly
Visibility: 1 mile variable 4 miles, fog
3-hr Precip:  0.15 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E2 OVC 1VR-F 095/47/47/2117G28/011/ LWR STFRA ALQDS
VSBY 1V4 PK WND 2229/25/ 8/6// 56033 6015/

1 P.M.
Weather: Overcast stratocumulus, sun occasionally dimly visible
Temperature: 57F Dew Point: 56F; Relative Humidity: 96%
Wind: SSW @ 15G27 kts
Sea-level pressure: 1015.8 mb; 30.00 in. Hg: falling rapidly
Visibility: 30 miles, thin fog
6-hr Max temp: 57F
6-hr Min temp: 40F
6-hr Precip:  0.18 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E10 OVC 30 158/57/56/2115G27/000/ SUN OCNLY DMLY VSBL
PRESFR PK WND 2128/42/ 8/5// 58037 6018/ 10057 20040

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SUMMARY FOR WEDNESDAY, APRIL 2, 2025

TEMPERATURE (DEGREES F)
MAX…….42   NORMAL…..50
MIN…….27   NORMAL…..33
MEAN……35   NORMAL…..41

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-6
TOTAL DEPARTURE FOR THE MONTH……………………..-3 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….30  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH…………….51  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE SEASON………….4980  DEPARTURE……-415
TOTAL HEATING UNITS LAST SEASON TO DATE……..4682  DEPARTURE……+298

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)………..29 NNW  @   01:42 A.M.
VECTOR #1 (1-Sec)……….28 NNW  @   12:13 A.M.
VECTOR #2 (1-Sec)……….30 NNW  @   12:16 A.M.
DAVIS #1……………….26 NNW  @   12:02 A.M.
DAVIS #2 ………………27 N    @   12:13 A.M.
RMY #1 (Instantaneous)…..29 NNW  @   12:13 A.M.
RMY #2 (Instantaneous)…..30 NNW  @   12:16 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NNW  @   12:18 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21      @   12:14 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21      @   12:18 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 NNW  @   12:14 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 N    @   12:18 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 NNW  @   12:14 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 NNW  @   12:18 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.8 SE [234 total miles] VECTOR #1……………….9.7
VECTOR #2………………10.0
DAVIS #1………………..9.9 ENE
DAVIS #2………………..9.8 E
RMY #1………………….9.3 ENE
RMY #2………………….9.8 ENE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.24 DEPARTURE…..+0.07
TOTAL PRECIPITATION FOR THE MONTH…………..0.41 DEPARTURE…..+0.08
TOTAL PRECIPITATION FOR THE YEAR (2025)…….11.12 DEPARTURE…..-3.23

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-33.2

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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 The low since midnight is 32F, the daily normal low is 33F.

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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 3
HIGH 76 IN 1892
LOW 16 IN 1894
PRECIP 2.18 IN. IN 1990
SNOWFALL 8.0 IN. IN 1915
PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH]

RECORDS FOR APRIL 4
HIGH 76 IN 2010
LOW 12 IN 1954
PRECIP 1.45 IN. IN 1987
SNOWFALL 7.3 IN. IN 2016
PEAK GUST 80 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Matt Douglas