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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, DECEMBER 26, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0712E
SUNSET: 1618E
ANOTHER ARCTIC AIR MASS BLASTS INTO THE REGION LAST EVENING;
A VERY COLD DAY TODAY WITH WELL BELOW NORMAL TEMPERATURES….
An arctic front pushed through last evening with a blast,
literally. A rather sudden gust to 55mph occurred just before
6:30pm last evening, announcing the arrival of the arctic front.
Strong cold air advection continued through the night with
gusty wind and temperatures dropping to around 8F by 7am this
morning.
Skies started the day with clear skies and sunshine, but clouds
have quickly advanced into the area ahead of our next weather
system.
Temperatures are running well below normal today as readings
have only recovered to around 20F early this afternoon after
starting the day in the single digits. The dew point tells the
story of the air mass in place with values dropping below
zero for a time this morning. Overall they have been averaging
around zero to the very low single digits through the day.
The wind was busy this morning, giving wind chills as low as -10F
early this morning. Mercifully, the wind has really calmed down
as we pushed into early this afternoon. The average speed for
the day so far is around 13mph, but has dropped to around 5mph
over the last couple of hours. The peak gust for the day, which
occurred around 4:10am this morning, is 33mph.
Visibility has been very good today, rising from around 50 miles
early this morning to around 70 miles for the balance of the day.
The maximum temperature so far today is 21F degrees, which is
17 degrees below the normal high of 38F. The minimum temperature
since midnight is 8F degrees, which is 14 degrees below the
normal low of 22F.
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Today’s Observations:
7 A.M.
Weather: Thin scattered cirrus, few stratocumulus offshore
distant NE-S
Temperature: 8F; Dew Point: 0F; Relative Humidity: 67%
Wind: NNW @ 13G22 kts
Sea-level pressure: 1023.1 mb; 30.21 in. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 15F
6-hr Min temp: 8F
24-hr Precip: Trace
24-hr Snowfall: Trace
Snow Depth: Trace
BHO SA 1155 250 -SCT 50 231/8/0/3313G22/021/ FEW SC OFFSHR DSNT NE-S
TOTAL NEW SNW PST 24 HRS TRACE/ 8/501 4/000 51013 70000 10015 20008
10 A.M.
Weather: Thin broken cirrus, few stratocumulus offshore distant NE-S
Temperature: 14F; Dew Point: 2F; Relative Humidity: 57%
Wind: NNW @ 9G14 kts
Sea-level pressure: 1024.2 mb; 30.24 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E250 -BKN 70 242/14/2/3309G14/024/ FEW SC OFFSHR DSNT
NE-S/ 8/501 51011
1 P.M.
Weather: Overcast cirrus, few breaks in overcast distant NNE-ESE,
few stratocumulus offshore distant NE-SE
Temperature: 20F; Dew Point: 3F; Relative Humidity: 47%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1021.8 mb; 30.17 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 21F
6-hr Min temp: 8F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: Trace
BHO SA 1755 E250 OVC 70 218/20/3/3406/017/ FEW BINOVC DSNT NNE-ESE
FEW SC OFFSHR DSNT NE-SE WND LGT/ 8/502 4/000 58024 10021 20008
————————————————————–
SUMMARY FOR THURSDAY, DECEMBER 25, 2025
TEMPERATURE (DEGREES F)
MAX…….38 NORMAL…..38
MIN…….16 NORMAL…..22
MEAN……27 NORMAL…..30
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3
TOTAL DEPARTURE FOR THE MONTH………………………-92 [-3.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….38 DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………883 DEPARTURE…….+91
TOTAL HEATING UNITS FOR THE SEASON………….2000 DEPARTURE……..+5
TOTAL HEATING UNITS LAST SEASON TO DATE……..1786 DEPARTURE……+214
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)………..55 NNW @ 06:29 P.M.
VECTOR #1 (1-Sec)……….55 NNW @ 06:29 P.M.
VECTOR #2 (1-Sec)……….55 NNW @ 06:29 P.M.
DAVIS #1……………….53 NNW @ 06:19 P.M.
DAVIS #2 ………………51 NNW @ 06:29 P.M.
RMY #1 (Instantaneous)…..60 NNW @ 06:29 P.M.
RMY #2 (Instantaneous)…..57 NNW @ 06:19 P.M.
MERLIN…………………52 NNW
RICHARDS (C5C) (Inst)……58 NNW @ 06:29 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………40 NNW @ 06:20 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..35 NNW @ 06:21 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..35 NNW @ 06:21 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………36 NNW @ 06:21 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………35 N @ 06:21 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..35 NNW @ 06:20 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..35 NNW @ 06:21 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………36 NNW @ 06:21 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.9 NNW [358 total miles]
VECTOR #1………………14.6
VECTOR #2………………15.0
DAVIS #1……………….14.7 WNW
DAVIS #2……………….14.8 NW
RMY #1…………………14.3 WNW
RMY #2…………………14.7 W
RICHARDS (C5C)………….14.4
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..1.88 DEPARTURE…..-2.55
TOTAL PRECIPITATION FOR THE YEAR (2025)…….46.34 DEPARTURE…..-6.56
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH………………..3.2 DEPARTURE…..-6.3
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….3.3 DEPARTURE…..-8.7
————————————————————–
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 The low since midnight is 8F, 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 26
HIGH 58 IN 1973,1982
LOW -12 IN 1980
PRECIP 3.64 INS. IN 1969
SNOWFALL 17.5 INS. IN 1909
PEAK GUST 84 MPH SSE IN 1957
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
TODAY’S REPORT PREPARED BY: Matt Douglas/Lily Chen
