Saturday, December 27, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, DECEMBER 27, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET: 1618E
THE BIGGEST SNOW EVENT OF THE SEASON SO FAR OCCURRED OVERNIGHT
INTO EARLY THIS MORNING; ANOTHER VERY WINTRY DAY WITH WELL BELOW
NORMAL TEMPERATURES….
A clipper system that slipped south of the region and redeveloped
off the coast brought a decent snowfall to the region overnight
into early this morning. 3.6″ of snow accumulated here on the
summit between 9pm and 7am. This melted down to 0.23″ of liquid,
giving a snow to water ratio of around 16:1. So it was definitely
a light fluffy snow.
Clouds lingered through the morning along with occasional
flurries, but have finally moved out early this afternoon with
sunshine taking over.
Temperatures are once again running well below normal today.
Readings were stuck in the teens through the morning hours, but
have finally reached the low 20s by early this afternoon. This is
still solidly around 15 degrees below normal for the date!
Thankfully, the wind hasn’t been a big deal today. The flow has
been out of the north averaging at around 11mph for the day so
far. Gusts have occasionally reached 20mph, but it hasn’t been
too frequent. The peak gust for the day so far is 23mph, which
occurred just after 8am this morning.
Visibility was limited this morning due to the snow, but has
improved markedly early this afternoon as everything clears out.
The view is up to around 60 miles early this afternoon.
The maximum temperature so far today is 23F degrees, which is
14 degrees below the normal high of 37F. The minimum temperature
since midnight is 14F degrees, which is 8 degrees below the
normal low of 22F.
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Today’s Observations:
7 A.M.
Weather: Overcast stratus, virga E-S
Temperature: 15F; Dew Point: 12F; Relative Humidity: 88%
Wind: N @ 12G18 kts
Sea-level pressure: 1018.3 mb; 30.07 in. Hg: rising, then more rapidly
Visibility: 25 miles, 10 miles E-S
6-hr Max temp: 16F
6-hr Min temp: 14F
24-hr Precip: 0.23 inches
24-hr Snowfall: 3.6 inches
Snow Depth: 4 inches
BHO SA 1155 E10 OVC 25 183/15/13/0112G18/007/ S-E46 VIRGA E-S
VSBY 10 E-S TOTAL NEW SNW PST 24 HRS 3.6 INS/ 8/6// 4/004 53017
6010/ 70023 10016 20014
10 A.M.
Weather: Overcast stratus, very light snow
Temperature: 15F; Dew Point: 13F; Relative Humidity: 90%
Wind: N @ 12G19 kts
Sea-level pressure: 1020.6 mb; 30.14 in. Hg: rising, then more slowly
Visibility: 15 miles, 40 miles NNW-N, 10 miles NNE-NE, 6 miles ENE-S
3-hr Precip: Trace
3-hr Snowfall: Trace
BHO SA 1455 E7 OVC 15S- 206/15/13/3612G19/014/ FEW BINOVC DSNT NNW-N
S-B00 PCPN VRY LGT VSBY 40 NNW-N 10 NNE-NE 6 ENE-S TOTAL NEW SNW PST
3 HRS TRACE/ 8/6// 51023 6000/
1 P.M.
Weather: Scattered altocumulus, scattered cirrus, few stratocumulus
distant NE-SSW
Temperature: 23F; Dew Point: 14F; Relative Humidity: 70%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1019.9 mb; 30.12 in. Hg: steady, then falling
Visibility: 60 miles
6-hr Max temp: 23F
6-hr Min temp: 14F
6-hr Precip: Trace
6-hr Snowfall: Trace
Snow Depth: 4 inches
BHO SA 1755 50 SCT 250 SCT 60 199/23/14/3406/012/ FEW SC DSNT NE-SSW
WND LGT TOTAL NEW SNW PST 6 HRS TRACE/ 8/551 4/004 58007 6000/
10023 20014
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SUMMARY FOR FRIDAY, DECEMBER 26, 2025
TEMPERATURE (DEGREES F)
MAX…….21 NORMAL…..38
MIN……..8 NORMAL…..22
MEAN……15 NORMAL…..30
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-15
TOTAL DEPARTURE FOR THE MONTH……………………..-107 [-4.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….50 DEPARTURE…….+15
TOTAL HEATING UNITS FOR THE MONTH……………933 DEPARTURE……+106
TOTAL HEATING UNITS FOR THE SEASON………….2050 DEPARTURE…….+19
TOTAL HEATING UNITS LAST SEASON TO DATE……..1820 DEPARTURE……+230
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 *=Last of multiple occurrences
F420C (Official)………..33 NNW @ 04:09 A.M.
VECTOR #1 (1-Sec)……….33 NNW @ 12:31 A.M.
VECTOR #2 (1-Sec)……….36 NW @ 12:32 A.M.
DAVIS #1……………….31 NW @ 12:28 A.M.
DAVIS #2 ………………33 NNW @ 12:33 A.M.
RMY #1 (Instantaneous)…..34 NNW @ 12:32 A.M.
RMY #2 (Instantaneous)…..37 NW @ 12:32 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……32 NNW @ 12:32 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NNW @ 12:42 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23 NNW @ 12:33 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24 NW @ 12:33 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 NW @ 12:33 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 NNW @ 12:33 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 NNW @ 12:33 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 NW @ 12:33 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23 NNW @ 12:33 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.0 NNW [193 total miles]
VECTOR #1……………….8.6
VECTOR #2……………….8.8
DAVIS #1………………..8.4 NNW
DAVIS #2………………..8.1 NNW
RMY #1………………….8.3 NNW
RMY #2………………….8.5 NW
RICHARDS (C5C)…………..8.6
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.23 DEPARTURE…..+0.06
TOTAL PRECIPITATION FOR THE MONTH…………..2.11 DEPARTURE…..-2.49
TOTAL PRECIPITATION FOR THE YEAR (2025)…….46.57 DEPARTURE…..-6.50
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..3.6 DEPARTURE…..+3.1
TOTAL SNOWFALL FOR THE MONTH………………..6.8 DEPARTURE…..-3.2
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….6.9 DEPARTURE…..-5.6
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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
12/1 42/27/35/-2/T/0.0/547/98 37 WNW VEC1 37 WNW RMY 38
12/2 36/27/32/-5/0.85/T/000/00 38 N VEC1 38 NNE RMY 38
12/3 37/27/32/-4/0.06/0.6/423/76 28 NW VEC1 29 NNW RMY 30
12/4 38/15/27/-9/T/T/255/46 60 NW VEC1 59 WNW RMY 61
12/5 25/8/17/-19/T/T/510/92 30 NW VEC1 30 NW RMY 30
12/6 39/25/32/-3/T/T/122/22 21 W VEC1 21 W RMY 22
12/7 39/27/33/-2/0.00/0.0/248/45 24 W VEC1 24 W RMY 24
12/8 31/12/22/-13/T/T/457/83 43 NW VEC1 43 NW RMY 44
12/9 28/9/19/-15/0.00/0.0/452/82 33 SSW VEC1 33 SSW RMY 33
12/10 46/28/37/+3/0.04/T/187/34 50 SSW VEC1 50 SSW RMY 51
12/11 37/21/29/-5/0.00/0.0/450/82 51 WNW VEC1 51 WNW RMY 53
12/12 33/18/26/-8/0.00/0.0/532/97 41 W VEC1 41 W RMY 42
12/13 34/23/29/-4/0.00/0.0/038/07 28 SW VEC1 28 SW RMY 31
12/14 31/15/23/-10/0.13/1.8/000/00 39 NNW VEC1 39 NNW RMY 40
12/15 23/10/17/-16/0.00/0.0/496/91 40 NW VEC1 40 NW RMY 42
12/16 36/19/28/-4/0.00/0.0/437/80 29 SW VEC1 29 SW RMY 30
12/17 45/25/35/+3/0.00/0.0/196/36 43 SW VEC1 42 SW RMY 43
12/18 47/32/40/+8/0.00/0.0/539/99 32 S VEC1 32 S RMY 34
12/19 58/32/45/+13/0.60/T/000/00 79 S VEC1 79 S RMY 81
12/20 36/27/32/+1/0.00/0.0/446/82 46 WNW VEC1 46 WNW RMY 45
12/21 45/28/37/+6/0.00/0.0/480/88 46 SSW VEC1 46 SSW RMY 46
12/22 31/22/27/-4/0.00/0.0/539/99 44 NW VEC1 44 NW RMY 44
12/23 35/26/31/0/0.19/0.8/000/00 20 SE VEC1 18 SSE RMY 19
12/24 36/24/30/0/0.03/T/180/33 50 NNW VEC1 49 NNW RMY 52
12/25 38/16/27/-3/T/T/…/.. 55 NNW VEC1 55 NNW RMY 60
12/26 21/8/15/-15/0.09/1.4/…/.. 33 NNW VEC1 33 NNW RMY 34
12/27 The low since midnight is 14F, the daily normal low is 22F.
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DECEMBER DAILY RECORDS TO DATE
12/19 PEAK GUST OF 79 MPH S,
BEAT THE OLD RECORD OF 68 MPH NE IN 1986.
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 27
HIGH 57 IN 1895,1949
LOW -4 IN 1903
PRECIP 2.43 INS. IN 1969
SNOWFALL 11.2 INS. IN 1947
PEAK GUST 73 S IN 2011
RECORDS FOR DECEMBER 28
HIGH 60 IN 1982
LOW -2 IN 1933
PRECIP 2.16 INS. IN 1967
SNOWFALL 9.5 INS. IN 1967
PEAK GUST 89 MPH SSE IN 1983
TODAY’S REPORT PREPARED BY: Matt Douglas
