Wednesday, January 22, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JANUARY 22, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0706E
SUNSET: 1646E
PLENTY OF INEFFECTIVE SUNSHINE TODAY AS VERY COLD TEMPERATURES CONTINUE….
Skies have been mainly clear today aside from some high thin cirrus
clouds grazing eastern Southern New England on the edge of a storm
system well offshore. Despite the abundance of sunshine, the air is
still quite cold as we remain in an arctic air mass.
The temperature dropped to 2F early morning here on the summit, but once
again, some locations in the lower elevations got below zero. Readings
have recovered to around 20F by early this afternoon making for another
well below normal day. Dew point values have been at or below zero all
day so far, very much indicative of the arctic air mass in place over
the region.
The wind hasn’t been overly strong, but it has been a fairly steady
breeze out of the north-northwest to north. Despite the relatively light
speed, with the very cold air in place, wind chill values have only risen
to the upper single digits and very low teens, after dropping as low as
-15F early this morning. The average speed for the day so far is around
10mph. The peak gust, which occurred at 4:36am this morning, was 20mph.
Visibility has been somewhat limited by some haziness, which isn’t
uncommon in very cold air masses. The view has generally been between
40-50 miles today.
The maximum temperature for today is 20F degrees, which is 14 degrees
below the normal high of 34F. The minimum temperature since midnight
is 2F degrees, which is 15 degrees below the normal low of 17F.
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus offshore distant NE-SE,
few cirrostratus distant ESE-SW
Temperature: 2F; Dew Point: -8F; Relative Humidity: 63%
Wind: NNW @ 9 kts
Sea-level pressure: 1031.9 mb; 30.47 in. Hg: falling, then rising
Visibility: 40 miles
6-hr Max temp: 9F
6-hr Min temp: 2F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 4 inches
BHO SA 1155 CLR 40 319/2/-8/3309/047/ FEW SC OFFSHR DSNT NE-SE
FEW CS DSNT ESE-SW/ 8/508 4/004 53007 10009 20002
10 A.M.
Weather: Clear, few stratocumulus offshore distant NE-SE, few cirrus
distant E-S-WSW
Temperature: 13F; Dew Point: 0F; Relative Humidity: 56%
Wind: N @ 7 kts
Sea-level pressure: 1032.1 mb; 30.48 in. Hg: falling, then rising
Visibility: 40 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 40 321/13/0/3607/048/ FEW SC OFFSHR DSNT NE-SE
FEW CI DSNT E-S-WSW/ 8/501 53002
1 P.M.
Weather: Clear, few stratocumulus offshore distant NE-SE, few cirrus
distant E-S
Temperature: 20F; Dew Point: -1F; Relative Humidity: 40%
Wind: N @ 4 kts, wind light
Sea-level pressure: 1031.2 mb; 30.45 in. Hg: falling steadily
Visibility: 50 miles
6-hr Max temp: 20F
6-hr Min temp: 2F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 4 inches
BHO SA 1755 CLR 50 312/20/-1/3504/045/ FEW SC OFFSHR DSNT NE-SE
FEW CI DSNT E-S WND LGT/ 8/501 4/004 57009 10020 20002
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SUMMARY FOR TUESDAY, JANUARY 21, 2025
TEMPERATURE (DEGREES F)
MAX…….18 NORMAL…..34
MIN……..6 NORMAL…..17
MEAN……12 NORMAL…..26
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-14
TOTAL DEPARTURE FOR THE MONTH…………………….-12 [-0.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………53 DEPARTURE…….+14
TOTAL HEATING UNITS FOR THE MONTH…………..812 DEPARTURE…….+11
TOTAL HEATING UNITS FOR THE SEASON…………2744 DEPARTURE……-267
TOTAL HEATING UNITS LAST SEASON TO DATE…….2645 DEPARTURE…….+99
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
F420C (Official)………..21 W @ 10:07 A.M.
VECTOR #1 (1-Sec)……….21 WNW @ 01:20 A.M.
VECTOR #2 (1-Sec)……….21 WW @ 01:27 A.M.
DAVIS #1……………….20 W @ 01:06 A.M.
DAVIS #2 ………………20 WNW @ 01:26 A.M.
RMY #1 (Instantaneous)…..21 W @ 05:57 A.M.
RMY #2 (Instantaneous)…..20 W @ 01:59 P.M.
MERLIN…………………19 W
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 WNW @ 05:35 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 05:57 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 @ 01:21 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 W @ 04:19 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 WNW @ 01:22 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 W @ 05:57 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 WNW @ 01:23 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.0 W [217 total miles]
VECTOR #1……………….9.3
VECTOR #2……………….9.6
DAVIS #1………………..9.6 W
DAVIS #2………………..9.6 W
RMY #1………………….8.9 W
RMY #2………………….9.4 W
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..1.52 DEPARTURE…..-1.59
TOTAL PRECIPITATION FOR THE YEAR (2025)……..1.52 DEPARTURE…..-1.59
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH………………..7.4 DEPARTURE……-4.7
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……20.0 DEPARTURE……-7.2
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PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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
1/1 47/36/42/+13/0.55/0.0/000/00 44 W VEC1 45 W RMY 44
1/2 42/31/37/+9/T/T/534/97 60 W VEC1 60 WNW RMY 63
1/3 36/26/31/+3/0.00/0.0/446/81 48 W VEC1 48 W RMY 51
1/4 29/22/26/-2/0.00/0.0/453/82 43 NW VEC1 43 NW RMY 48
1/5 32/18/25/-3/0.00/0.0/088/16 39 WNW VEC1 39 WNW RMY 40
1/6 23/15/19/-9/0.00/0.0/000/00 31 NNW VEC1 31 NNW RMY 31
1/7 24/11/18/-9/T/T/450/81 43 WNW VEC1 42 WNW RMY 47
1/8 27/14/21/-6/0.00/0.0/550/99 48 WNW VEC1 48 WNW RMY 52
1/9 25/13/19/-8/T/T/223/40 46 NW VEC1 47 NW RMY 51
1/10 40/19/30/+3/0.00/0.0/560/100 39 NW VEC1 39 NW RMY 42
1/11 30/21/26/-1/0.12/1.7/000/00 25 NW VEC1 26 NW RMY 28
1/12 36/19/28/+1/0.00/0.0/556/99 35 NNW VEC1 35 NNW RMY 39
1/13 39/26/33/+7/0.00/0.0/192/34 26 WNW VEC1 27 WNW RMY 27
1/14 32/20/26/0/0.00/0.0/537/95 44 WNW VEC1 44 WNW RMY 45
1/15 29/16/23/-3/0.00/0.0/504/89 37 NW VEC1 37 NW RMY 38
1/16 30/13/22/-4/T/T/…/.. 20 W VEC1 20 SSW RMY 20
1/17 35/16/26/0/T/T/…/.. 20 S VEC1 20 SSW RMY 20
1/18 44/27/36/+10/0.26/0.0/…/.. 36 S VEC1 37 S RMY 39
1/19 43/27/35/+9/0.51/4.6/…/.. 26 N VEC1 28 NNW RMY 29
1/20 27/9/18/-8/0.08/1.1/…/.. 32 NW VEC1 32 NW RMY 36
1/21 18/6/12/-14/0.00/0.0/…/.. 21 W VEC1 21 WNW RMY 21
1/22 The low since midnight is 2F, the daily normal low is 17F.
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JANUARY 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 JANUARY 22
HIGH 59F IN 1916
LOW -8F IN 1888,1976
PRECIP 1.24 INS. IN 1891,1987
SNOWFALL 10.0 INS. IN 2005
PEAK GUST 67 MPH W IN 1976
RECORDS FOR JANUARY 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 1.69 INS. IN 1966
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992
TODAY’S REPORT PREPARED BY: Matt Douglas
