Sunday, December 28, 2025

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

SUNDAY, DECEMBER 28, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET:  1619E

A BRILLIANTLY SUNNY START, BUT CLOUDS QUICKLY INCREASING; THE
ARCTIC COLD IS EASING A BIT FOR NOW….

We started the day with near clear skies and plenty of sunshine.
However, high clouds are quickly advancing into the area as our
next weather system approaches the region. For now, the day is
rather enjoyable as temperatures have gotten above freezing and
the wind is on the light side. It actually feels “warm” out
today, which goes to show you just how cold it has been the past
few days.

As mentioned, temperatures have exceeded the freezing mark today
with readings into the mid 30s early this afternoon. Dew point
values are less arctic-like as well as they rise from the low
teens early this morning to the upper teens by early this
afternoon.

The wind has been on the much lighter side today. A northwest
flow during the early part of the day has backed more to a
westerly flow by early this afternoon. The average speed for
the day so far is around 10mph. The peak gust for the day so far
is 20mph, which occurred just after 5:30am this morning.

Visibility has been somewhat limited today due to haziness,
most of which has been stuck under an inversion. The view has
been generally 50-60 miles all day.

The maximum temperature so far today is 35F degrees, which is
2 degrees below the normal high of 37F. The minimum temperature
since midnight is 14F degrees, which is 8 degrees below the
normal low of 22F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Thin scattered cirrus
Temperature: 16F; Dew Point: 10F; Relative Humidity: 78%
Wind: WNW @ 9 kts
Sea-level pressure: 1021.6 mb; 30.17 in. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 17F
6-hr Min temp: 14F
24-hr Precip: Trace
24-hr Snowfall: Trace
Snow Depth: 4 inches
BHO SA 1155 250 -SCT 50 216/16/10/3009/017/ TOTAL NEW SNW PST
24 HRS TRACE/ 8/001 4/004 51008 70000 10017 20014

10 A.M.
Weather: Thin scattered cirrus
Temperature: 26F; Dew Point: 15F; Relative Humidity: 63%
Wind: WNW @ 8 kts
Sea-level pressure: 1021.0 mb; 30.15 in. Hg: rising, then falling
Visibility: 50 miles, 30 miles below inversion SW-NNW
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 250 -SCT 50 210/26/15/3008/015/ THN K LYR ALNG HRZN
SE-SW-NNW VSBY 30 BLW INVRSN SW-NNW/ 8/001 58006

1 P.M.
Weather: Thin broken cirrus
Temperature: 35F; Dew Point: 19F; Relative Humidity: 50%
Wind: W @ 5 kts, wind light
Sea-level pressure: 1018.1 mb; 30.06 in. Hg: falling steadily
Visibility: 60 miles
6-hr Max temp: 35F
6-hr Min temp: 16F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 3 inches
BHO SA 1755 E250 -BKN 60 181/35/19/2605/006/ WND LGT/ 8/001 4/003
57029 10035 20016

————————————————————–

SUMMARY FOR SATURDAY, DECEMBER 27, 2025

TEMPERATURE (DEGREES F)
MAX…….25   NORMAL…..37
MIN…….14   NORMAL…..22
MEAN……20   NORMAL…..30

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-10
TOTAL DEPARTURE FOR THE MONTH……………………..-117 [-4.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….45  DEPARTURE…….+10
TOTAL HEATING UNITS FOR THE MONTH……………978  DEPARTURE……+116
TOTAL HEATING UNITS FOR THE SEASON………….2095  DEPARTURE…….+29
TOTAL HEATING UNITS LAST SEASON TO DATE……..1853  DEPARTURE……+242

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)………..23 N    @   08:07 A.M.
VECTOR #1 (1-Sec)……….23 N    @   08:07 A.M.
VECTOR #2 (1-Sec)……….23 N    @   07:17 A.M.
DAVIS #1……………….20 N    @   06:34 A.M.
DAVIS #2 ………………20 NNE  @   08:08 A.M.
RMY #1 (Instantaneous)…..24 N    @   07:13 A.M.
RMY #2 (Instantaneous)…..23 N    @   08:45 A.M.
MERLIN…………………22 N
RICHARDS (C5C) (Inst)……23 N    @   08:07 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 N    @   08:38 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 N    @   07:11 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 N    @   08:08 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 N    @   07:11 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 NNE  @   08:08 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 N    @   07:11 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 N    @   08:08 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16 N    @   08:09 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.4 N [225 total miles] VECTOR #1……………….9.9
VECTOR #2………………10.3
DAVIS #1………………..9.7 NNW
DAVIS #2………………..9.7 N
RMY #1………………….9.8 NNW
RMY #2…………………10.2 NNW
RICHARDS (C5C)………….10.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..2.11 DEPARTURE…..-2.65
TOTAL PRECIPITATION FOR THE YEAR (2025)…….46.57 DEPARTURE…..-6.66

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH………………..6.8 DEPARTURE…..-3.7
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….6.9 DEPARTURE…..-6.1

————————————————————–

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  The low since midnight is 14F, the daily normal low is 22F.

————————————————————–

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 28
HIGH 60 IN 1982
LOW -2 IN 1933
PRECIP 2.16 INS. IN 1967
SNOWFALL 9.5 INS. IN 1967
PEAK GUST 89 MPH SSE IN 1983

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)

TODAY’S REPORT PREPARED BY: Matt Douglas/Lily Chen