Monday, December 29, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, DECEMBER 29, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET: 1620E
A TOUCH OF FREEZING RAIN OVERNIGHT, OTHERWISE A GRAY AND WET
DAY TODAY….
A large and powerful storm system tracking through the Great Lakes
northward into Canada brought a warm front through the area
overnight. Ahead of this feature, cold surface temperatures held
while rain overspread the region, leading to a period of freezing
rain late last evening into the first hour or two of today.
Thereafter, enough warming occurred to change it over to plain
rain.
Today has featured overcast skies with periods of drizzle and
rain through the day. Rainfall amounted to 0.22″ overnight with
an additional 0.09″ falling between 7am and 1pm today.
Temperatures have warmed up quite a bit today following the
warm frontal passage. Readings have reached the mid 40s this
afternoon, marking only the 7th day this month to reach 40F
degrees or higher. As a matter of fact, today will only be the
7th day this month to have an average temperature above normal!
The wind has been fairly steady so far today, mainly out of the
south-southwest. The average speed for the day so far is around
16mph. There was a period of stronger gusts during the predawn
hours during which the peak gust for the day so far occurred.
35mph was measured just before 4:30am this morning. More strong
winds are expected to develop tonight and last through tomorrow.
Visibility has of course been very poor today since we’ve been
stuck in the clouds (fog) the entire day. The visibility has
only been between 1/16th and 1/8th of a mile all day.
The maximum temperature so far today is 46F degrees, which is
9 degrees above the normal high of 37F. The minimum temperature
since midnight is 31F degrees, which is 10 degrees above the
normal low of 21F.
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Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 43F; Dew Point: 43F; Relative Humidity: 100%
Wind: S @ 17G23 kts
Sea-level pressure: 999.6 mb; 29.52 in. Hg: falling, then more slowly
Visibility: 1/8 mile, fog
6-hr Max temp: 43F
6-hr Min temp: 31F
24-hr Precip: 0.22 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1155 X W2 1/8L-F 996/43/43/1917G23/952/ L- INTMT/ 8////
4/001 56042 6010/ 70022 10043 20031
10 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 44F; Dew Point: 44F; Relative Humidity: 100%
Wind: SSW @ 14G21 kts
Sea-level pressure: 997.0 mb; 29.44 in. Hg: falling, then more slowly
Visibility: 1/16 mile, fog
3-hr Precip: Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 1/16F 970/44/44/2114G21/944/ 8//// 56026 6000/
1 P.M.
Weather: Sky obscured, vertical visibility 200ft, light rain
Temperature: 45F; Dew Point: 45F; Relative Humidity: 100%
Wind: SSW @ 11G16 kts
Sea-level pressure: 992.4 mb; 29.31 in. Hg: falling, then more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 45F
6-hr Min temp: 43F
6-hr Precip: 0.09 inches
6-hr Snowfall: 0.0 inches
Snow Depth: Trace
BHO SA 1755 X W2 1/16R-F 924/45/45/2011G16/931/ 8//// 4/000
58046 6009/ 10045 20043
————————————————————–
SUMMARY FOR SUNDAY, DECEMBER 28, 2025
TEMPERATURE (DEGREES F)
MAX…….36 NORMAL…..37
MIN…….14 NORMAL…..22
MEAN……25 NORMAL…..29
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-4
TOTAL DEPARTURE FOR THE MONTH……………………..-121 [-4.5 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…………..1018 DEPARTURE……+120
TOTAL HEATING UNITS FOR THE SEASON………….2135 DEPARTURE…….+33
TOTAL HEATING UNITS LAST SEASON TO DATE……..1880 DEPARTURE……+255
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)………..26 SSW @ 10:44 P.M.
VECTOR #1 (1-Sec)……….26 SSW @ 10:44 P.M.
VECTOR #2 (1-Sec)……….25 SSW @ 10:36 P.M.
DAVIS #1……………….27 S @ 10:41 P.M.
DAVIS #2 ………………26 SW @ 10:44 P.M.
RMY #1 (Instantaneous)…..26 SSW @ 10:44 P.M.
RMY #2 (Instantaneous)…..26 SSW @ 10:36 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……24 SSW @ 10:44 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SSW @ 10:46 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 SSW @ 10:44 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 SSW @ 10:45 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 S @ 10:41 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 SSW @ 10:45 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SSW @ 10:45 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 SSW @ 10:45 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 SSW @ 10:45 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.8 SSW [236 total miles]
VECTOR #1………………10.2
VECTOR #2………………10.7
DAVIS #1……………….10.2 W
DAVIS #2……………….10.3 W
RMY #1…………………10.2 W
RMY #2…………………10.6 W
RICHARDS (C5C)………….10.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.22 DEPARTURE…..+0.07
TOTAL PRECIPITATION FOR THE MONTH…………..2.33 DEPARTURE…..-2.58
TOTAL PRECIPITATION FOR THE YEAR (2025)…….46.79 DEPARTURE…..-6.59
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH………………..6.8 DEPARTURE…..-4.2
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….6.9 DEPARTURE…..-6.6
————————————————————–
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 25/14/20/-10/0.14/2.2/…/.. 23 N VEC1 23 N RMY 24
12/28 36/14/25/-4/0.04/0.0/…/.. 26 SSW VEC1 26 SSW RMY 26
12/29 The low since midnight is 31F, 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 29
HIGH 72 IN 1984
LOW -19 IN 1933 (RECORD FOR DECEMBER)
PRECIP 1.89 INS. IN 1945
SNOWFALL 18.4 INS. IN 1945
PEAK GUST 95 MPH S IN 1966 (RECORD FOR DECEMBER)
RECORDS FOR DECEMBER 30
HIGH 63 IN 2022
LOW -18 IN 1933
PRECIP 1.54 INS. IN 1942
SNOWFALL 7.5 INS. IN 1956
PEAK GUST 81 MPH WNW IN 1962
TODAY’S REPORT PREPARED BY: Matt Douglas
