Thursday, January 23, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, JANUARY 23, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0706E
SUNSET: 1647E
CLOUDY START, THEN PARTIALLY CLEARING SKIES WITH FILTERED SUNSHINE….
Skies started the day on the cloudy side as some warm air advection
was taking place. Some echoes were seen on radar very early this
morning, but the air mass was too dry to allow for anything to
reach the ground, however virga was observed at that time. The clouds
cleared out by late morning for a time before more high level clouds
moved back in early this afternoon leaving us with filtered sunshine.
Temperatures are not quite as cold as the past couple of days. The
low this morning was 10 degrees warmer than yesterday! Readings have
reached the 30F degree mark just before the 1pm observation, which
feels kind of nice compared to recent days. The dew point was below
zero through last evening into early this morning, but has finally
risen into the low to mid teens by early this afternoon, indicating
that the arctic air mass is moving out of the region.
Winds were steady through most of the morning, but began to pick up
in velocity by noon-time out of the south-southwest to southwest.
The average speed for the day so far is around 10mph. The peak gust,
which occurred at 11:38am this morning, is 29mph.
Visibility has been rather limited today due to haziness with the view
only running between 30-40 miles today.
The maximum temperature for today is 30F degrees, which is 4 degrees
below the normal high of 34F. The minimum temperature since midnight
is 12F degrees, which is 5 degrees below the normal low of 17F.
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Today’s Observations:
7 A.M.
Weather: Broken altocumulus/altostratus, overcast cirrostratus,
few breaks in overcast distant ESE-S, few stratocumulus offshore
distant NE-SE, virga all quadrants
Temperature: 14F; Dew Point: -3F; Relative Humidity: 46%
Wind: SW @ 8 kts
Sea-level pressure: 1028.7 mb; 30.38 in. Hg: falling, then more rapidly
Visibility: 40 miles
6-hr Max temp: 14F
6-hr Min temp: 13F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 4 inches
BHO SA 1155 E110 BKN 180 OVC 40 287/14/-3/2208/038/ FEW BINOVC DSNT
ESE-S FEW SC OFFSHR DSNT NE-SE VIRGA ALQDS/ 8/577 4/004 58016 10014
20013
10 A.M.
Weather: Broken altocumulus, broken cirrus, few lower altocumulus
distant NNW-E-S
Temperature: 19F; Dew Point: 8F; Relative Humidity: 62%
Wind: SW @ 7 kts
Sea-level pressure: 1027.3 mb; 30.34 in. Hg: falling, then more slowly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E120 BKN 250 BKN 30 273/19/8/2307/034/ FEW LWR AC DSNT
NNW-E-S HAZY/ 8/071 56014
1 P.M.
Weather: Broken cirrocumulus, broken cirrus, few stratocumulus distant
SE-SW-W, few altocumulus distant NE-SE
Temperature: 29F; Dew Point: 14F; Relative Humidity: 53%
Wind: SW @ 9G15 kts
Sea-level pressure: 1022.9 mb; 30.21 in. Hg: falling steadily
Visibility: 40 miles, hazy
6-hr Max temp: 30F
6-hr Min temp: 14F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 4 inches
BHO SA 1755 E200 BKN 250 BKN 40 229/29/14/2309G15/021/ FEW SC DSNT
SE-SW-W FEW AC DSNT NE-SE HAZY/ 8/079 4/004 58044 10030 20014
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SUMMARY FOR WEDNESDAY, JANUARY 22, 2025
TEMPERATURE (DEGREES F)
MAX…….21 NORMAL…..34
MIN……..2 NORMAL…..17
MEAN……12 NORMAL…..26
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-14
TOTAL DEPARTURE FOR THE MONTH…………………….-26 [-1.4 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…………..865 DEPARTURE…….+25
TOTAL HEATING UNITS FOR THE SEASON…………2797 DEPARTURE……-253
TOTAL HEATING UNITS LAST SEASON TO DATE…….2685 DEPARTURE……+112
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)………..20 NNW @ 04:36 A.M.
VECTOR #1 (1-Sec)……….20 NNW @ 05:07 A.M.
VECTOR #2 (1-Sec)……….20 NW @ 05:16 A.M.
DAVIS #1……………….19 NW @ 04:36 A.M.
DAVIS #2 ………………18 N @ 04:51 A.M.
RMY #1 (Instantaneous)…..20 NNW @ 05:07 A.M.
RMY #2 (Instantaneous)…..21 NW @ 05:16 A.M.
MERLIN…………………19 NW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 NNW @ 05:06 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 @ 07:15 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 04:51 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 NNW @ 05:09 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 NNW @ 05:00 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 NNW @ 05:09 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..14 NW @ 04:51 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.0 NNW [169 total miles]
VECTOR #1……………….7.7
VECTOR #2……………….7.9
DAVIS #1………………..7.3 NW
DAVIS #2………………..7.8 NNW
RMY #1………………….7.6 NW
RMY #2………………….7.9 WNW
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…..-1.73
TOTAL PRECIPITATION FOR THE YEAR (2025)……..1.52 DEPARTURE…..-1.73
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……-5.3
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……20.0 DEPARTURE……-7.8
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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/301/53 20 W VEC1 20 SSW RMY 20
1/17 35/16/26/0/T/T/410/72 20 S VEC1 20 SSW RMY 20
1/18 44/27/36/+10/0.26/0.0/046/08 36 S VEC1 37 S RMY 39
1/19 43/27/35/+9/0.51/4.6/276/48 26 N VEC1 28 NNW RMY 29
1/20 27/9/18/-8/0.08/1.1/460/80 32 NW VEC1 32 NW RMY 36
1/21 18/6/12/-14/0.00/0.0/173/30 21 W VEC1 21 WNW RMY 21
1/22 21/2/12/-14/0.00/0.0/545/94 20 NNW VEC1 20 NNW RMY 20
1/23 The low since midnight is 12F, 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 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
RECORDS FOR JANUARY 24
HIGH 60F IN 1967
LOW -12F IN 1907
PRECIP 2.40 INS. IN 1935
SNOWFALL 11.3 INS. IN 1935
PEAK GUST 82 MPH S IN 1996
TODAY’S REPORT PREPARED BY: Matt Douglas
