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Monday, December 22, 2025

December 22, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY, DECEMBER 22, 2025 ALL TIMES ARE…

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

MONDAY, DECEMBER 22, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0711E
SUNSET:  1615E

COLD BUT BRIGHTS SKIES TODAY WITH GUSTY NORTHWEST WINDS….

Partly cloudy skies started off our Monday, and by the mid
morning hours we had mostly clear skies. A crisp, blue sky
with dry air and strong northwest winds have made today
really feel like winter with the chilly temperatures.

Temperatures were much colder in the morning than the past
few days. Even with all day sunshine, temperatures struggled
to recover, and as such we are still 9 degrees below the
normal high for the day. Dew points started in the teens
and by this afternoon and dipped into the single digits.

There has been a predominant northwest flow for much of the
day today, bringing a blustery feel to the area. There have
been frequent gusts in the 20-25mph range for much of the
morning, but by afternoon the wind has seemed to decrease a
bit. The average speed for the day so far is 15mph. The peak
gust is approximately 44mph, occurring at 7:27am this morning.

Visibility was around 40 miles this morning and improved to
80 miles after mid morning.

The maximum temperature so far today is 30F degrees, which is
9 degrees below the normal high of 39F. The minimum temperature
since midnight is 22F degrees, which is 1 degree below the
normal low of 23F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrus, few stratocumulus
NE-E, few stratocumulus distant ESE-SSW
Temperature: 22F; Dew Point: 12F; Relative Humidity: 62%
Wind: NW @ 15G27 kts, peak wind NW 35 mph at 06:20 A.M.
Sea-level pressure: 1027.7 mb; 30.35 in. Hg: rising, then
more rapidly
Visibility: 40 miles
6-hr Max temp: 28F
6-hr Min temp: 22F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 95 SCT 250 SCT 40 277/22/12/3115G27/035/ FEW SC NE-E
FEW SC DSNT ESE-SSW PK WND 3230/20/ 8/551 53026 10028 20022

10 A.M.
Weather: Clear, few stratocumulus WSW-WNW, few stratocumulus
distant all quadrants
Temperature: 25F; Dew Point: 8F; Relative Humidity: 48%
Wind: NW @ 13G28 kts, peak wind NW 33 mph at 09:03 A.M.
Sea-level pressure: 1029.9 mb; 30.41 in. Hg: rising, then
steady
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 70 299/25/8/3213G28/041/ FEW SC WSW-WNW FEW
SC DSNT ALQDS PK WND 3229/03/ 8/500 51022

1 P.M.
Weather: Clear, few stratocumulus distant ENE-SSE-SSW, few
cirrus W
Temperature: 30F; Dew Point: 6F; Relative Humidity: 36%
Wind: NW @ 10G18 kts
Sea-level pressure: 1028.8 mb; 30.38 in. Hg: falling, then
more slowly
Visibility: 80 miles
6-hr Max temp: 30F
6-hr Min temp: 22F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 80 288/30/6/3110G18/038/ FEW SC DSNT ENE-SSE-SSW
FEW CI W/ 8/501 56011 10030 20022

————————————————————–

SUMMARY FOR SUNDAY, DECEMBER 21, 2025

TEMPERATURE (DEGREES F)
MAX…….45   NORMAL…..39
MIN…….28   NORMAL…..24
MEAN……37   NORMAL…..31

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+6
TOTAL DEPARTURE FOR THE MONTH………………………-85 [-4.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….28  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH……………738  DEPARTURE…….+85
TOTAL HEATING UNITS FOR THE SEASON………….1855  DEPARTURE……..-2
TOTAL HEATING UNITS LAST SEASON TO DATE……..1604  DEPARTURE……+251

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)………..46 SSW  @   01:02 A.M.
VECTOR #1 (1-Sec)……….46 SSW  @   01:02 A.M.
VECTOR #2 (1-Sec)……….42 SSW  @   01:02 A.M.
DAVIS #1……………….45 S    @   12:59 A.M.
DAVIS #2 ………………44 S    @   01:03 A.M.
RMY #1 (Instantaneous)…..46 SSW  @   01:02 A.M.
RMY #2 (Instantaneous)…..44 SSW  @   01:02 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……45 SSW  @   01:02 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………32 SSW  @   01:04 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..29 SSW  @   01:04 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30 WNW  @   01:08 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………30 W    @   10:57 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………31 WNW  @   01:09 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..29 SSW  @   01:04 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..30 WNW  @   01:08 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………28 SSW  @   01:04 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..18.6 WNW [446 total miles] VECTOR #1………………17.9
VECTOR #2………………19.1
DAVIS #1……………….18.4 W
DAVIS #2……………….19.0 W
RMY #1…………………17.3 W
RMY #2…………………18.7 W
RICHARDS (C5C)………….17.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..1.68 DEPARTURE…..-2.06
TOTAL PRECIPITATION FOR THE YEAR (2025)…….46.14 DEPARTURE…..-6.07

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH………………..2.4 DEPARTURE…..-5.2
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….2.5 DEPARTURE…..-7.6

————————————————————–

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/…/..       32 S   VEC1 32 S   RMY 34
12/19  58/32/45/+13/0.60/0.0/…/..      79 S   VEC1 79 S   RMY 81
12/20  36/27/32/+1/0.00/0.0/…/..       46 WNW VEC1 46 WNW RMY 45
12/21  45/28/37/+6/0.00/0.0/…/..       46 SSW VEC1 46 SSW RMY 46

12/22  The low since midnight is 22F, the daily normal low is 23F.

————————————————————–

DECEMBER DAILY RECORDS TO DATE

12/19 PEAK GUST OF 79 MPH S,
BEAT THE OLD RECORD OF 68 MPH NE IN 1986.

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR DECEMBER 22
HIGH 63 IN 2013
LOW -5 IN 1921
PRECIP 1.52 INS. IN 1975
SNOWFALL 8.8 INS. IN 1975
PEAK GUST 62 MPH WNW IN 1998

RECORDS FOR DECEMBER 23
HIGH 62 IN 1990
LOW -1 IN 1989
PRECIP 1.53 INS. IN 1994
SNOWFALL 11.9 INS. IN 1947
PEAK GUST 74 SE IN 2022

TODAY’S REPORT PREPARED BY: Amanda Joly

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