Wednesday, December 31, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, DECEMBER 31, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET: 1622E
SUNSHINE WITH SOME INCREASING HIGH CLOUDS, STILL COLD BUT MUCH
LESS WINDY….
The sky has been filled with mainly high cirrus clouds today,
as such, we’ve managed to get a decent amount of filtered
sunshine. All in all it’s not a bad day for this last day of
2025 thanks to much less wind and temperatures not quite as cold
as yesterday.
Temperatures started the day in the low 20s and have recovered
to the low 30s by early this afternoon. While still below normal,
it feels a lot better than it did yesterday. Dew point values have
been holding in the lower teens, indicative of a very dry air mass
still in place.
The wind, while still a bit active, is not nearly as intense as it
was yesterday. A generally southwesterly wind has been averaging
at around 14mph for the day so far. The strongest wind of the day
occurred during the wee hours of the morning. A peak gust of
37mph occurred right around 1:20am this morning.
Visibility has been decent today, generally improving from
around 50 miles early this morning to around 70 miles by early
this afternoon.
The maximum temperature so far today is 32F degrees, which is
4 degrees below the normal high of 36F. The minimum temperature
since midnight is 21F degrees, which is equal to the normal low
of 21F.
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Today’s Observations:
7 A.M.
Weather: Broken cirrus, few stratocumulus distant NE-SE-SSW
Temperature: 21F; Dew Point: 10F; Relative Humidity: 62%
Wind: SW @ 10G16 kts
Sea-level pressure: 1007.1 mb; 29.74 in. Hg: falling, then rising
Visibility: 50 miles
6-hr Max temp: 23F
6-hr Min temp: 21F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E250 BKN 50 071/21/10/2210G16/974/ FEW SC DSNT
NE-SE-SSW/ 8/502 53016 10023 20021
10 A.M.
Weather: Broken cirrus, few stratocumulus distant WNW-N-SE-SW
Temperature: 26F; Dew Point: 11F; Relative Humidity: 53%
Wind: SW @ 12G23 kts
Sea-level pressure: 1008.7 mb; 29.79 in. Hg: rising, then more slowly
Visibility: 60 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E250 BKN 60 087/26/11/2312G23/979/ FEW SC DSNT
WNW-N-SE-SW/ 8/502 51016
1 P.M.
Weather: Broken altocumulus, broken cirrus, few stratocumulus
all quadrants
Temperature: 30F; Dew Point: 12F; Relative Humidity: 45%
Wind: W @ 10G19 kts
Sea-level pressure: 1006.1 mb; 29.71 in. Hg: falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 32F
6-hr Min temp: 21F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E130 BKN 250 BKN 70 061/30/12/2610G19/971/
FEW SC ALQDS/ 8/552 56026 10032 20021
————————————————————–
SUMMARY FOR TUESDAY, DECEMBER 30, 2025
TEMPERATURE (DEGREES F)
MAX…….29 NORMAL…..37
MIN…….20 NORMAL…..21
MEAN……25 NORMAL…..29
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-4
TOTAL DEPARTURE FOR THE MONTH……………………..-116 [-4.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….40 DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH…………..1085 DEPARTURE……+115
TOTAL HEATING UNITS FOR THE SEASON………….2202 DEPARTURE…….+28
TOTAL HEATING UNITS LAST SEASON TO DATE……..1912 DEPARTURE……+290
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)………..59 WNW @ 04:09 A.M.
VECTOR #1 (1-Sec)……….59 WNW @ 04:09 A.M.
VECTOR #2 (1-Sec)……….64 WNW @ 04:27 A.M.
DAVIS #1……………….60 W @ 04:09 A.M.
DAVIS #2 ………………60 WNW @ 04:27 A.M.
RMY #1 (Instantaneous)…..63 WNW @ 04:09 A.M.
RMY #2 (Instantaneous)…..63 WNW @ 04:27 A.M.
MERLIN…………………53 W
RICHARDS (C5C) (Inst)……63 WNW @ 04:09 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………41 W @ 04:49 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..40 W @ 04:49 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..41 W @ 04:48 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………42 W @ 04:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………41 WNW @ 04:35 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..37 W @ 04:49 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..39 W @ 04:35 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………39 W @ 04:49 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..23.7 W [568 total miles]
VECTOR #1………………22.1
VECTOR #2………………23.3
DAVIS #1……………….23.8 W
DAVIS #2……………….23.6 WNW
RMY #1…………………21.0 W
RMY #2…………………22.5 W
RICHARDS (C5C)………….21.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..2.73 DEPARTURE…..-2.50
TOTAL PRECIPITATION FOR THE YEAR (2025)…….47.19 DEPARTURE…..-6.51
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…..-0.6
TOTAL SNOWFALL FOR THE MONTH………………..6.8 DEPARTURE…..-5.3
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….6.9 DEPARTURE…..-7.7
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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/071/13 55 NNW VEC1 55 NNW RMY 60
12/26 21/8/15/-15/0.09/1.4/393/72 33 NNW VEC1 33 NNW RMY 34
12/27 25/14/20/-10/0.14/2.2/245/45 23 N VEC1 23 N RMY 24
12/28 36/14/25/-4/0.04/0.0/453/83 26 SSW VEC1 26 SSW RMY 26
12/29 47/29/38/+9/0.58/T/000/00 53 W VEC1 50 W RMY 53
12/30 29/20/25/-4/0.00/0.0/279/51 59 WNW VEC1 59 WNW RMY 63
12/31 The low since midnight is 21F, the daily normal low is 21F.
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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 31
HIGH 62 IN 1965
LOW -12 IN 1917
PRECIP 0.96 INS. IN 1906
SNOWFALL 7.5 INS. IN 2008
PEAK GUST 78 MPH NW IN 1990
RECORDS FOR JANUARY 1
HIGH 58F IN 1966
LOW -6F IN 1918
PRECIP 1.45 INS. IN 1982
SNOWFALL 7.2 INS. IN 1938
PEAK GUST 90e MPH S IN 1945
TODAY’S REPORT PREPARED BY: Matt Douglas
