Sunday, December 14, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, DECEMBER 14, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0706E
SUNSET: 1612E
STORM SYSTEM BRINGING WIDESPREAD STEADY LIGHT SNOW TO THE AREA….
Snow began falling just after 1am this morning and has continued
steadily, nonstop, since. Despite the number of hours of snow,
it’s been steadily on the light side throughout the event. As such
only 1.2″ have fallen for the event so far. This has melted
down to 0.10″ of liquid equivalent, giving us a ratio of 12:1 for
this event so far..
Temperatures settled into the upper 20s once the snow started
and have been holding there since. As has been the case for most
of the month to date, this is once again well below the normal
value for mid December.
Winds have been quite light and variable, even going calm for a
couple of hours this morning. The trend however since about mid
morning is for a more northerly wind which has picked up a bit
to generally between 5-10mph. The average speed for the day so
far is only around 5mph. The peak gust so far is only 20mph,
which occurred just after 1pm.
Visibility has of course been limited all day due to the snow
and fog, with the view generally hanging around 1-2 miles for
most of the day, but has crept up to around 5-6 miles early
this afternoon as the snow intensity lessens.
The maximum temperature so far today is 31F degrees, which is
10 degrees below the normal high of 41F. The minimum temperature
since midnight is 28F degrees, which is 3 degrees above the
normal low of 25F.
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Today’s Observations:
7 A.M.
Weather: Scattered stratus fractus, overcast nimbostratus,
light snow
Temperature: 28F; Dew Point: 28F; Relative Humidity: 100%
Wind: Calm
Sea-level pressure: 1013.7 mb; 29.94 in. Hg: falling, then more slowly
Visibility: 1 mile, 2 miles WSW-NNW, fog
6-hr Max temp: 31F
6-hr Min temp: 28F
24-hr Precip: 0.03 inches
24-hr Snowfall: 0.4 inches
Snow Depth: Trace
BHO SA 1155 7 SCT E30 OVC 1S-F 137/28/28/0000/994/ VSBY 2 WSW-NNW
WND CALM TOTAL NEW SNW PST 24 HRS 0.4 INS/ 8/72/ 4/000 56011 6003/
70003 10031 20028
10 A.M.
Weather: Sky obscured, vertical visibility 300ft, light snow
Temperature: 29F; Dew Point: 29F; Relative Humidity: 100%
Wind: NNW @ 4 kts, wind light
Sea-level pressure: 1013.7 mb; 29.94 in. Hg: rising, then falling
Visibility: 1 mile, fog
3-hr Precip: 0.04 inches
3-hr Snowfall: 0.4 inches
BHO SA 1455 X W3 1S-F 137/29/29/3304/994/ WND LGT TOTAL NEW SNW
PST 3 HRS 0.4 INS/ 8//// 50000 6004/
1 P.M.
Weather: Broken stratocumulus, overcast nimbostratus, very light snow
Temperature: 29F; Dew Point: 27F; Relative Humidity: 93%
Wind: NNW @ 9G16 kts
Sea-level pressure: 1010.5 mb; 29.84 in. Hg: falling, then more slowly
Visibility: 5 miles, fog
6-hr Max temp: 30F
6-hr Min temp: 28F
6-hr Precip: 0.07 inches
6-hr Snowfall: 0.8 inches
Snow Depth: 1 inches
BHO SA 1755 E12 BKN 30 OVC 5S-F 105/29/27/3409G16/984/
PCPN VRY LGT TOTAL NEW SNW PST 6 HRS 0.8 INS/ 8/52/ 4/001
56032 6007/ 10030 20028
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SUMMARY FOR SATURDAY, DECEMBER 13, 2025
TEMPERATURE (DEGREES F)
MAX…….35 NORMAL…..41
MIN…….23 NORMAL…..26
MEAN……29 NORMAL…..33
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-4
TOTAL DEPARTURE FOR THE MONTH………………………-86 [-6.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….36 DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH……………475 DEPARTURE…….+85
TOTAL HEATING UNITS FOR THE SEASON………….1592 DEPARTURE……..-2
TOTAL HEATING UNITS LAST SEASON TO DATE……..1349 DEPARTURE……+243
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)………..28 SW @ 11:16 A.M.
VECTOR #1 (1-Sec)……….28 SW @ 11:16 A.M.
VECTOR #2 (1-Sec)……….28 SW @ 12:59 P.M.
DAVIS #1……………….27 SW @ 11:16 A.M.
DAVIS #2 ………………27 SW @ 11:27 A.M.
RMY #1 (Instantaneous)…..31 SW @ 01:08 P.M.
RMY #2 (Instantaneous)…..29 SW @ 12:59 P.M.
MERLIN…………………28 SW
RICHARDS (C5C) (Inst)……29 SW @ 01:08 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 SW @ 12:43 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 SW @ 01:08 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 SW @ 12:19 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 SW @ 01:09 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 SW @ 01:08 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SW @ 01:08 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 SW @ 12:19 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 SW @ 01:08 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.2 WSW [245 total miles]
VECTOR #1………………10.3
VECTOR #2………………10.8
DAVIS #1……………….10.3 SW
DAVIS #2……………….10.7 WSW
RMY #1…………………10.2 SW
RMY #2…………………10.8 SW
RICHARDS (C5C)………….10.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.03 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..0.98 DEPARTURE…..-1.35
TOTAL PRECIPITATION FOR THE YEAR (2025)…….45.44 DEPARTURE…..-5.36
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.4 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE MONTH………………..1.0 DEPARTURE…..-3.1
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….1.1 DEPARTURE…..-5.5
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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 The low since midnight is 28F, the daily normal low is 25F.
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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 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941
RECORDS FOR DECEMBER 15
HIGH 64 IN 1975
LOW 4 IN 1900, 1905, 1933
PRECIP 1.80 INS. IN 1981
SNOW 7.5 INS. IN 1951
PEAK GUST 65 MPH NW IN 1991
TODAY’S REPORT PREPARED BY: Matt Douglas
