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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, DECEMBER 10, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0703E
SUNSET: 1612E
A BRIEF REPRIEVE FROM THE ARCTIC AIR, BREEZY AND MILDER TODAY….
A warm front moved through the region overnight bringing some
light snow to areas to our north and west. Here at Blue Hill a
brief snow shower did occur between midnight and 1am, but it
didn’t amount to any more than a trace. The biggest difference
however is with the rising temperatures, which began during the
evening hours of last night.
Today has featured a lot of clouds, but there have been enough
breaks to allow for some partial filtered sunshine.
With temperatures edging a bit above normal today, it feels like
a spring day relative to the well below normal temperatures we’ve
been experiencing over the past few days. Readings have reached
the mid 40s by early this afternoon, which would feel a lot nicer
if there were less wind today. The dew point has risen quite a bit
as well, from the single digits yesterday to the mid 30s today.
The wind has been on the increase today, mainly out of the south-
west to south-southwest. The average speed for the day so far is
around 16mph. Gusts have been becoming more frequent and stronger
since the mid morning hours. The peak gust so far for the day is
41mph, which occurred just after 12pm.
Visibility has been limited today due to haziness. The view has
been stuck around 30 miles all day.
The maximum temperature so far today is 45F degrees, which is
3 degrees above the normal high of 42F. The minimum temperature
since midnight is 28F degrees, which is 1 degree above the
normal low of 27F.
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken cirrus
Temperature: 33F; Dew Point: 28F; Relative Humidity: 81%
Wind: SW @ 12G18 kts
Sea-level pressure: 1008.6 mb; 29.78 in. Hg: falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 33F
6-hr Min temp: 29F
24-hr Precip: Trace
24-hr Snowfall: Trace
Snow Depth: 0 inches
BHO SA 1155 140 SCT 250 BKN 30 086/33/28/2212G18/978/ HAZY/
8/051 56015 70000 10033 20029
10 A.M.
Weather: Scattered altocumulus, broken cirrus, few stratocumulus
distant SE-S-WSW
Temperature: 39F; Dew Point: 29F; Relative Humidity: 67%
Wind: SW @ 12G18 kts
Sea-level pressure: 1006.8 mb; 29.73 in. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 70 SCT 250 BKN 30 068/39/29/2212G18/073/ FEW SC DSNT
SE-S-WSW HAZY/ 8/551 58018
1 P.M.
Weather: Broken altocumulus, broken cirrus, few stratocumulus
all quadrants
Temperature: 45F; Dew Point: 35F; Relative Humidity: 67%
Wind: SSW @ 17G26 kts, peak wind SSW 41mph at 12:10 P.M.
Sea-level pressure: 1000.4 mb; 29.54 in. Hg: falling rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 45F
6-hr Min temp: 33F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E120 BKN 250 BKN 30 004/45/35/2017G26/954/ FEW SC ALQDS
HAZY PRESFR PK WND 2036/10/ 8/551 58064 10045 20033
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SUMMARY FOR TUESDAY, DECEMBER 9, 2025
TEMPERATURE (DEGREES F)
MAX…….28 NORMAL…..42
MIN……..9 NORMAL…..27
MEAN……19 NORMAL…..34
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-15
TOTAL DEPARTURE FOR THE MONTH………………………-72 [-8.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….46 DEPARTURE…….+15
TOTAL HEATING UNITS FOR THE MONTH……………336 DEPARTURE…….+72
TOTAL HEATING UNITS FOR THE SEASON………….1453 DEPARTURE…….-15
TOTAL HEATING UNITS LAST SEASON TO DATE……..1239 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)………..33 SSW @ 11:12 P.M.
VECTOR #1 (1-Sec)……….33 SSW @ 11:12 P.M.
VECTOR #2 (1-Sec)……….32 SSW @ 11:12 P.M.
DAVIS #1……………….34 S @ 10:27 P.M.
DAVIS #2 ………………32 S @ 10:31 P.M.
RMY #1 (Instantaneous)…..33 SSW @ 10:38 P.M.
RMY #2 (Instantaneous)…..33 SSW @ 11:12 P.M.
MERLIN…………………30 SSW
RICHARDS (C5C) (Inst)……30 SSW @ 10:27 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 SSW @ 10:44 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 SSW @ 10:28 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 SSW @ 10:28 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 S @ 10:44 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 SSW @ 11:13 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SSW @ 10:28 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 SSW @ 10:28 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………22 SSW @ 10:28 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.2 SSW [244 total miles]
VECTOR #1………………10.7
VECTOR #2………………11.0
DAVIS #1……………….10.6 WSW
DAVIS #2……………….10.8 WSW
RMY #1…………………10.6 WSW
RMY #2…………………11.0 WSW
RICHARDS (C5C)………….10.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.91 DEPARTURE…..-0.70
TOTAL PRECIPITATION FOR THE YEAR (2025)…….45.37 DEPARTURE…..-4.71
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE…..-0.4
TOTAL SNOWFALL FOR THE MONTH………………..0.6 DEPARTURE…..-2.0
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….0.7 DEPARTURE…..-4.4
————————————————————–
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/…/.. 43 NW VEC1 43 NW RMY 44
12/9 28/9/19/-15/0.00/0.0/…/.. 33 SSW VEC1 33 SSW RMY 33
12/10 The low since midnight is 28F, the daily normal low is 27F.
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DECEMBER DAILY RECORDS TO DATE
NONE.
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INS. IN 1907
SNOWFALL 6.0 INS. IN 1905
PEAK GUST 66e SW IN 1940
RECORDS FOR DECEMBER 11
HIGH 63 IN 1911
LOW -1 IN 1988
PRECIP 3.38 INS. IN 2024
SNOWFALL 4.8 INS. IN 2019
PEAK GUST 78 S IN 1969
TODAY’S REPORT PREPARED BY: Matt Douglas
