Monday, December 1, 2025

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

MONDAY, DECEMBER 1, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0654E
SUNSET:  1612E

CHILLY WITH A GUSTY NORTHWEST WIND ON THIS FIRST DAY OF
METEOROLOGICAL WINTER….

Skies have been clear for the most part today save for a period
of broken cloud cover during the mid morning hours. Despite the
chilly temperatures and gusty wind, it really isn’t a bad day at
all as we enjoy a respite between weather systems. Speaking of
which, yesterday’s frontal system brought 0.16″ of rain to Blue
Hill along with some gusty winds. Temperatures briefly pushed
into the upper 40s last evening before returning to more winter-
like readings by early this morning.

Temperatures have been generally seasonable today with readings
reaching the low 40s by early this afternoon after bottoming out
near freezing just after 7am. Dew point values have been holding
in the 20s today indicative of the colder air mass that over-
spread the region overnight.

The wind was stronger during the morning hours today, but has
since stepped back into early this afternoon. A generally west-
northwest wind has been averaging at around 13mph for the day so
far. Gusts were frequently exceeding 30mph overnight through the
mid-morning hours today, however they have eased quite a bit early
this afternoon. The peak gust for the day so far is 37mph, which
occurred just before 10am this morning.

Visibility has been excellent today, increasing from 50 miles
early this morning to around 70 miles for the balance of the day.

The maximum temperature so far today is 42F degrees, which is
3 degrees below the normal high of 45F. The minimum temperature
since midnight is 32F degrees, which is 3 degrees above the
normal low of 29F.

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PRELIMINARY STATS FOR NOVEMBER 2025

TEMPERATURE, Deg. F
Avg. Max. 48.7 [-1.4] Avg. Min. 33.8 [ 0.0] Mean      41.3 [-0.7] 24-hour corrected mean: 41.2
Max. for month: 61F on the 9th
Min. for month: 27F on the 19th, 20th, 29th

HEATING DEGREE DAYS
Total heating units:    706 [+014] Total for the season:  1117 [-087] Total for last season:  943

COOLING DEGREE DAYS
Total cooling units:      0 [+000] Total for the season:   756 [+079] Total for last season:  768

PRECIPITATION, Inches
Total: 2.15 [-2.16] Greatest in 24 hrs: 0.56 on the 15th-16th

SNOWFALL, Inches
Total: 0.1 [-1.7] Greatest in 24 hrs: 0.1 on the 15th

WIND, mph
Avg. uncorrected wind speed:  12.2 mph
Avg. corrected wind speed:    12.6 mph
Prevailing wind direction:   West-Northwest [26%] Peak gust and direction:  52 NW on the 4th

SUNSHINE:
Campbell-Stokes card minutes: 8922 of a possible 17010, or 52%
Astronomical total minutes: 9231 of a possible 17610 or 52%

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Today’s Observations:

7 A.M.
Weather: Clear, few sctratocumulus distant all quadrants,
few cirrostratus distant NE-SE-SSW, few cirrus distant NE-SE-WSW
Temperature: 34F; Dew Point: 27F; Relative Humidity: 76%
Wind: W @ 13 kts
Sea-level pressure: 1020.6 mb; 30.14 in. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 40F
6-hr Min temp: 33F
24-hr Precip: 0.16 inches
24-hr Snowfall: 0.0 inches
BHO SA 1155 CLR 50 206/34/27/2813/014/ FEW SC DSNT ALQDS
FEW CS DSNT NE-SE-SSW FEW CI DSNT NE-SE-WSW/ 8/508 51024
6000/ 70016 10040 20033

10 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 40F; Dew Point: 27F; Relative Humidity: 60%
Wind: WNW @ 18G32 kts, peak wind WNW 37mph at 9:51 A.M.
Sea-level pressure: 1022.9 mb; 30.21 in. Hg: rising unsteadily
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E40 BKN 250 BKN 70 229/40/27/3018G32/021/
PK WND 3032/51/ 8/501 52023

1 P.M.
Weather: Clear, few stratocumulus all quadrants, few cirrus distant
ENE-SSW and distant W-WNW
Temperature: 41F; Dew Point: 23F; Relative Humidity: 47%
Wind: NW @ 8G18 kts
Sea-level pressure: 1021.1 mb; 30.15 in. Hg: rising, then falling
Visibility: 70 miles
6-hr Max temp: 42F
6-hr Min temp: 32F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
BHO SA 1755 CLR 70 211/41/23/3208G18/015/ FEW SC ALQDS
FEW CI DSNT ENE-SSW AND DSNT W-WNW/ 8/501 50005 10042 20032

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SUMMARY FOR SUNDAY, NOVEMBER 30, 2025

TEMPERATURE (DEGREES F)
MAX…….48   NORMAL…..45
MIN…….28   NORMAL…..29
MEAN……38   NORMAL…..37

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+1
TOTAL DEPARTURE FOR THE MONTH………………………-15 [-0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….27  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH……………706  DEPARTURE…….+14
TOTAL HEATING UNITS FOR THE SEASON………….1117  DEPARTURE…….-87
TOTAL HEATING UNITS LAST SEASON TO DATE………943  DEPARTURE……+174

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………..0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE SEASON…………..756  DEPARTURE…….+79
TOTAL COOLING UNITS LAST SEASON TO DATE………768  DEPARTURE…….-12

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)………..31 SW   @   07:54 P.M.
VECTOR #1 (1-Sec)……….31 SSW  @   06:22 P.M.
VECTOR #2 (1-Sec)……….33 SW   @   07:53 P.M.
DAVIS #1……………….34 S    @   06:13 P.M.
DAVIS #2 ………………37 S    @   04:27 P.M.
RMY #1 (Instantaneous)…..35 SW   @   08:06 P.M.
RMY #2 (Instantaneous)…..33 SW   @   08:06 P.M.
MERLIN…………………32 WSW
RICHARDS (C5C) (Inst)……34 SW   @   07:54 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 S    @   04:45 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23 SW   @   07:55 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 SW   @   07:54 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 SW   @   07:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………29 S    @   05:42 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SW   @   07:54 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 S    @   06:08 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 SW   @   07:54 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.5 S [301 total miles] VECTOR #1………………12.5
VECTOR #2………………13.5
DAVIS #1……………….12.4 S
DAVIS #2……………….13.8 S
RMY #1…………………12.3 SSE
RMY #2…………………13.5 SSE
RICHARDS (C5C)………….12.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.16 DEPARTURE……0.00
TOTAL PRECIPITATION FOR THE MONTH…………..2.15 DEPARTURE…..-2.16
TOTAL PRECIPITATION FOR THE YEAR (2025)…….44.46 DEPARTURE…..-4.01

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…..-0.1
TOTAL SNOWFALL FOR THE MONTH………………..0.1 DEPARTURE…..-1.7
TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….0.1 DEPARTURE…..-2.4

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PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/1  56/38/47/+0/0.00/0.0/619/100       50 W   VEC1 50 W   RMY 50
11/2  53/33/43/-4/0.00/0.0/617/100       23 WNW VEC1 23 WNW RMY 24
11/3  54/42/48/+2/0.16/0.0/012/02        41 WNW VEC1 41 W   RMY 46
11/4  54/42/48/+2/0.00/0.0/605/99        52 NW  VEC1 52 NW  RMY 54
11/5  56/39/48/+2/0.06/0.0/091/15        50 W   VEC1 47 W   RMY 52
11/6  50/34/42/-3/0.02/T/449/74          48 WNW VEC1 48 WNW RMY 49
11/7  52/31/42/-3/0.04/0.0/448/74        43 SSW VEC1 42 SSW RMY 47
11/8  60/45/53/+8/0.18/0.0/307/51        32 WNW VEC1 33 WNW RMY 33
11/9  61/46/54/+10/0.15/0.0/216/36       33 ESE VEC1 34 ESE RMY 35
11/10 54/36/45/+1/0.44/0.0/000/00        32 W   VEC1 31 W   RMY 31
11/11 37/30/34/-9/T/T/131/22             46 WNW VEC1 44 WNW RMY 47
11/12 44/30/37/-6/T/T/148/25             32 W   VEC1 32 W   RMY 33
11/13 47/32/40/-3/T/0.0/071/12           32 NW  VEC1 32 NW  RMY 34
11/14 46/32/39/-3/0.00/0.0/495/84        30 NNW VEC1 30 NNW RMY 30
11/15 44/28/36/-6/0.37/0.1/522/89        26 SSE VEC1 26 SSE RMY 26
11/16 52/33/43/+1/0.19/T/280/48          50 NW  VEC1 49 W   RMY 53
11/17 41/29/35/-6/0.00/0.0/495/85        45 WNW VEC1 45 WNW RMY 46
11/18 46/30/38/-3/0.00/0.0/574/99        31 WNW VEC1 32 WNW RMY 33
11/19 44/27/36/-5/0.00/0.0/527/91        20 NNW VEC1 19 NW  RMY 20
11/20 45/27/36/-4/0.00/0.0/300/52        16 NNW VEC1 16 NNW RMY 16
11/21 45/34/40/0/0.00/0.0/075/13         28 SW  VEC1 28 SW  RMY 26
11/22 45/31/38/-2/0.16/0.0/046/08        22 NNW VEC1 22 NNW RMY 23
11/23 39/28/34/-5/T/T/154/27             18 WNW VEC1 19 WNW RMY 19
11/24 49/33/41/+2/T/T/506/89             30 NW  VEC1 31 NW  RMY 30
11/25 49/35/42/+3/0.14/0.0/000/00        32 S   VEC1 32 S   RMY 32
11/26 59/48/54/+16/0.08/0.0/040/07       33 S   VEC1 33 S   RMY 35
11/27 52/34/43/+5/T/0.0/525/93           43 WNW VEC1 43 WNW RMY 43
11/28 40/31/36/-2/T/T/417/74             42 W   VEC1 42 W   RMY 45
11/29 40/27/34/-4/0.00/0.0/561/100       36 WNW VEC1 36 W   RMY 36
11/30 48/28/38/+1/0.16/0.0/000/00        31 SW  VEC1 31 SSW RMY 35

12/1 The low since midnight is 32F, the daily normal low is 29F.

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NOVEMBER 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 1
HIGH 70 IN 2001
LOW 3 IN 1887
PRECIP 1.46 INS. IN 1917
SNOW 5.7 INS. IN 2019
PEAK GUST 72 MPH NW IN 1964

RECORDS FOR DECEMBER 2
HIGH 61 IN 1998
LOW 3 IN 1890
PRECIP 2.09 INS. IN 1974
SNOWFALL 5.0 INS. IN 1894, 1929
PEAK GUST 89e MPH SSE IN 1942

TODAY’S REPORT PREPARED BY: Matt Douglas