Tuesday, February 4, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, FEBRUARY 4, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0654E
SUNSET: 1703E
ANOTHER MILD DAY WITH INCREASING WIND AS COLD AIR ADVECTION BEGINS…
Today has featured varying amounts of scattered to broken cloud cover,
but overall we’ve seen plenty of sunshine throughout the day. Cold air
advection, which lagged behind a cold frontal passage that took place
early this morning, finally started in earnest by late this morning as
marked by increasing wind and decreasing dew point values.
The overnight temperatures didn’t even make it down to freezing for the
first time since January 1st! The low this morning was 33F, which is
15 degrees above the expected value for the date. Readings warmed
to the low 40s before the cold advection took over. Temperatures have
since fallen back to the mid 30s. Dew point values were in the low
30s this morning, but have now dropped into the teens this afternoon,
indicating the return of arctic air.
Winds have really ramped up as well since this morning. A west-
northwest to northwest wind has increased from 10-15mph early this
morning to 20-25mph this afternoon. The average speed overall for the
day is around 14mph to this point. Gusts are frequently exceeding 35mph
with a peak gust for the day so far of 47mph which occurred at 1:33pm.
Visibility is excellent today, rising from 40 miles early this morning
to around 70 miles by the mid morning hours.
The maximum temperature for today is 41F degrees, which is 6 degrees
above the normal high of 35F. The minimum temperature since midnight
is 33F degrees, which is 15 degrees above the normal low of 18F.
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, scattered cirrus, few stratocumulus
all quadrants
Temperature: 34F; Dew Point: 31F; Relative Humidity: 88%
Wind: NNW @ 9G15 kts
Sea-level pressure: 1007.9 mb; 29.76 in. Hg: rising, then more rapidly
Visibility: 40 miles
6-hr Max temp: 39F
6-hr Min temp: 33F
24-hr Precip: Trace
24-hr Snowfall: 0.0 inches
Snow Depth: Trace
BHO SA 1155 120 SCT 250 SCT 40 079/34/31/3309G15/976/ FEW SC ALQDS/
8/551 4/000 53010 70000 10039 20033
10 A.M.
Weather: Broken stratocumulus, broken altocumulus, broken cirrus
Temperature: 39F; Dew Point: 29F; Relative Humidity: 67%
Wind: WNW @ 14G23 kts
Sea-level pressure: 1009.9 mb; 29.82 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E30 BKN 150 BKN 250 BKN 70 099/39/29/3014G23/982/ 8/551 51020
1 P.M.
Weather: Broken stratocumulus, broken altocumulus, broken cirrus,
virga distant S-SSW and distant W-N
Temperature: 40F; Dew Point: 21F; Relative Humidity: 46%
Wind: NW @ 17G36 kts, peak wind NW 41mph at 12:48 P.M.
Sea-level pressure: 1010.7 mb; 29.85 in. Hg: rising, then steady
Visibility: 70 miles
6-hr Max temp: 41F
6-hr Min temp: 34F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: Trace
BHO SA 1755 E50 BKN 150 BKN 250 BKN 70 107/40/21/3117G36/985/
VIRGA DSNT S-SSW AND DSNT W-N PK WND 3136/48/ 8/551 4/000 51008
10041 20034
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SUMMARY FOR MONDAY, FEBRUARY 3, 2025
TEMPERATURE (DEGREES F)
MAX…….42 NORMAL…..35
MIN…….24 NORMAL…..18
MEAN……33 NORMAL…..26
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+7
TOTAL DEPARTURE FOR THE MONTH……………………..-9 [-3.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………32 DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH…………..126 DEPARTURE…….+10
TOTAL HEATING UNITS FOR THE SEASON…………3269 DEPARTURE……-251
TOTAL HEATING UNITS LAST SEASON TO DATE…….3060 DEPARTURE……+209
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)………..35 SSW @ 09:55 P.M.
VECTOR #1 (1-Sec)……….35 SSW @ 09:55 P.M.
VECTOR #2 (1-Sec)……….33 SSW @ 08:39 P.M.
DAVIS #1……………….36 S @ 10:05 P.M.
DAVIS #2 ………………38 S @ 08:17 P.M.
RMY #1 (Instantaneous)…..35 SSW @ 09:31 P.M.
RMY #2 (Instantaneous)…..35 SSW @ 09:55 P.M.
MERLIN…………………31 SW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 SSW @ 09:54 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25 @ 09:55 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25 @ 10:07 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 SSW @ 09:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 SSW @ 09:32 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..25 SSW @ 09:55 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 SSW @ 10:07 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.5 SSW [277 total miles]
VECTOR #1………………11.8
VECTOR #2………………12.1
DAVIS #1……………….11.2 SSW
DAVIS #2……………….12.0 SSW
RMY #1…………………11.7 SSW
RMY #2…………………12.3 SSW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.22 DEPARTURE…..-0.19
TOTAL PRECIPITATION FOR THE YEAR (2025)……..2.57 DEPARTURE…..-2.34
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH………………..1.9 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……22.9 DEPARTURE…..-12.8
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PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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
2/1 32/10/21/-5/0.07/0.4/…/.. 35 NNW VEC1 34 NNW RMY 35
2/2 24/5/15/-11/0.10/1.0/…/.. 22 SE VEC1 25 SE RMY 24
2/3 42/24/33/+7/0.05/0.5/…/.. 35 SSW VEC1 35 SSW RMY 35
2/4 The low since midnight is 33F, the daily normal low is 18F.
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FEBRUARY 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 FEBRUARY 4
HIGH 63F IN 1991
LOW -14F IN 2023
PRECIP 1.80 INS. IN 1926
SNOWFALL 15.0 INS. IN 1961
PEAK GUST 89 MPH SSE IN 1972
RECORDS FOR FEBRUARY 5
HIGH 65F IN 1991
LOW -14F IN 1918
PRECIP 1.62 INS. IN 2016
SNOWFALL 16.0 INS. IN 1907
PEAK GUST 67 MPH WNW IN 1969
TODAY’S REPORT PREPARED BY: Matt Douglas/Jack Willard
