Wednesday, December 24, 2025

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

WEDNESDAY, DECEMBER 24, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0712E
SUNSET:  1616E

CHRISTMAS EVE TURNS WINTRY AS SNOW AND COLD AIR SETTLE IN
TODAY….

We had some additional accumulation yesterday evening on the
hill, bringing us 0.8 inches of snow with 0.19 inches of liquid
equivalent. This morning we started with some sunshine and by
the late morning another round of snow made it to the area.
So far, we only have a trace of snow and 0.01 inches of liquid,
but temperatures are continuing to drop so the accumulation
may build.

Temperatures were ‘warmer’ in the mid morning hours, but have
decreased a bit in the past couple of hours. Dew point values
have remained in the lower 30’s and humidity has been near 100%
for much of the day. The blustery NNW winds have made it feel
even colder, with wind chills in the upper teens and lower 20’s.

The wind has been quite active today with the arrival of the
cold front, really picking up after 9am. Winds have been out
of the northwest and north-northwest for much of the day. We
have had frequent gusts in the 20-30mph range. The average
speed for the day so far is around 16mph. The peak gust is an
impressive 49mph, occurring at 10:14am this morning.

Visibility was in the 40 mile range for the day until the snow
showers moved in, which then brought us to only around 5 miles
of total visibility.

The maximum temperature so far today is 35F degrees, which is
3 degrees below the normal high of 38F. The minimum temperature
since midnight is 31F degrees, which is 8 degrees above the
normal low of 23F.

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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, few stratus fractus E-SSE
Temperature: 33F; Dew Point: 33F; Relative Humidity: 97%
Wind: WNW @ 15G23 kts
Sea-level pressure: 1009.1 mb; 29.80 in. Hg: rising, then
more rapidly
Visibility: 40 miles, thin fog all quadrants, smoke plume WNW
6-hr Max temp: 33F
6-hr Min temp: 32F
24-hr Precip: 0.19 inches
24-hr Snowfall: 0.8 inches
Snow Depth: 1 inch
BHO SA 1155 E65 BKN 40 091/33/33/3015G23/980/ FEW STRFRA
E-SSE THN F ALQDS VIRGA E-ESE K PLUME WNW TOTAL NEW SNW PST
24 HRS 0.8 INS/ 8/7// 53012 4/001 6000 70019 10033 20032

10 A.M.
Weather: Scattered stratocumulus
Temperature: 35F; Dew Point: 30F; Relative Humidity: 83%
Wind: NNW @ 21G33 kts, peak wind NNW 48mph at 9:23 A.M.
Sea-level pressure: 1014.5 mb; 29.96 in. Hg: rising, then
more rapidly
Visibility: 40 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 65 SCT 40 145/35/30/3321G33/996/ PRESRR
PK WND 3342/23/ 8/500 53054

1 P.M.
Weather: Light snow, broken stratocumulus, overcast
nimbostratus
Temperature: 31F; Dew Point: 31F; Relative Humidity: 98%
Wind: NNW @ 15G23 kts, peak wind NNW 41mph at 12:06 P.M.
Sea-level pressure: 1017.9 mb; 30.06 in. Hg: rising, then
more slowly
Visibility: 5 miles, fog
6-hr Max temp: 35F
6-hr Min temp: 31F
6-hr Precip: 0.01 inches
6-hr Snowfall: Trace
Snow Depth: 1 inch
BHO SA 1755 E20 BKN 40 OVC 5S-F 179/31/31/3415G23/006/
PK WND 3336/06/ TOTAL NEW SNW PST 3 HRS TRACE/ 8/52/ 51034
4/001 6001 10035 20031

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SUMMARY FOR TUESDAY, DECEMBER 23, 2025

TEMPERATURE (DEGREES F)
MAX…….35   NORMAL…..38
MIN…….26   NORMAL…..23
MEAN……31   NORMAL…..31

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..0
TOTAL DEPARTURE FOR THE MONTH………………………-89 [-4.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….34  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………810  DEPARTURE…….+88
TOTAL HEATING UNITS FOR THE SEASON………….1927  DEPARTURE……..+1
TOTAL HEATING UNITS LAST SEASON TO DATE……..1707  DEPARTURE……+220

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)………..20 SE   @   07:11 P.M.
VECTOR #1 (1-Sec)……….18 SSE  @   05:23 P.M.
VECTOR #2 (1-Sec)……….20 SE   @   06:20 P.M.
DAVIS #1……………….17 SSE  @   05:19 P.M.
DAVIS #2 ………………20 S    @   01:36 P.M.
RMY #1 (Instantaneous)…..19 SSE  @   07:08 P.M.
RMY #2 (Instantaneous)…..20 SE   @   06:20 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……17 SSE  @   07:08 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 SE   @   07:56 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..13 SE   @   07:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..14 SSE  @   07:24 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 SSE  @   07:00 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 SE   @   08:32 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 SSE  @   07:00 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 SE   @   08:32 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………13 SE   @   07:56 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.9 SSE [190 total miles] VECTOR #1……………….8.4
VECTOR #2……………….8.8
DAVIS #1………………..8.1 SSW
DAVIS #2………………..8.4 SSW
RMY #1………………….8.3 SSW
RMY #2………………….9.0 SSW
RICHARDS (C5C)…………..8.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.19 DEPARTURE…..+0.02
TOTAL PRECIPITATION FOR THE MONTH…………..1.87 DEPARTURE…..-2.22
TOTAL PRECIPITATION FOR THE YEAR (2025)…….46.33 DEPARTURE…..-6.23

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.8 DEPARTURE…..+0.3
TOTAL SNOWFALL FOR THE MONTH………………..3.2 DEPARTURE…..-5.3
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….3.3 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/…/..       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  31/22/27/-4/0.00/0.0/…/..       44 NW  VEC1 44 NW  RMY 44
12/23  35/26/31/0/0.19/0.8/…/..        20 SE  VEC1 18 SSE RMY 19

12/24  The low since midnight is 31F, the daily normal low is 23F.

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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 24
HIGH 67 IN 2015
LOW -6 IN 1943
PRECIP 2.21 INS. IN 1994
SNOWFALL 12.3 INS. IN 1961
PEAK GUST 79e MPH SE IN 1941

RECORDS FOR DECEMBER 25
HIGH 64 IN 2015
LOW -11 IN 1980
PRECIP 2.15 INS. IN 2020
SNOWFALL 8.5 INS. IN 2002
PEAK GUST 80 MPH NW IN 1971

TODAY’S REPORT PREPARED BY: Amanda Joly