Tuesday, January 28, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JANUARY 28, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0701E
SUNSET: 1654E
ARCTIC FRONT MOVES THROUGH WITH STRONG COLD AIR ADVECTION BEHIND IT…
A mix of sun and clouds were the theme this morning as an arctic
front approached the area. The front moved through between 10-11am
accompanied by a few light snow showers. Following the frontal
passage, strong cold air advection took over with temperatures
leveling off in the mid 30s and a very strong gusty northwest wind
taking over.
Temperatures made it to the mid 30s before the cold air advection
took over. Readings have leveled off for a bit, but is now falling
off and was in the low 30s by the 1pm observation. More notable
is the drop in the dew point, which rose to the low 20s just ahead
of the front, but has now fallen to the single digits by early this
afternoon.
The wind is the biggest story, and also a surprise as we’ve had gusts
exceed 60mph. The wind started the day out of the southwest, but has
now shifted to the northwest following the frontal passage. The average
speed for the day so far is 19mph, but the average for the past couple
of hours has been closer to 25mph! The peak gust so far is 65mph which
occurred at 11:53am.
Visibility was between 40-50 miles during the morning, dropping a bit
lower for a time thanks to the snow showers off to the west and
northwest. Behind the front however, the visibility has increased to
around 80 miles.
The maximum temperature for today is 36F degrees, which is 2 degrees
above the normal high of 34F. The minimum temperature since midnight
is 31F degrees, which is 14 degrees above the normal low of 17F.
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Today’s Observations:
7 A.M.
Weather: Broken altocumulus/altostratus, overcast cirrus, few
breaks in overcast distant E-S-SW
Temperature: 33F; Dew Point: 14F; Relative Humidity: 45%
Wind: WSW @ 13G20 kts
Sea-level pressure: 994.7 mb; 29.37 in. Hg: falling, then steady
Visibility: 40 miles
6-hr Max temp: 33F
6-hr Min temp: 32F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 3 inches
BHO SA 1155 E100 BKN 250 OVC 40 947/33/14/2513G20/937/ FEW BINOVC DSNT
E-S-SW/ 8/071 4/003 56005 10033 20032
10 A.M.
Weather: Broken stratocumulus, broken altostratus, broken altocumulus,
virga distant S-NW-NE
Temperature: 35F; Dew Point: 22F; Relative Humidity: 58%
Wind: W @ 21G33 kts, peak wind W 38mph at 9:47 A.M.
Sea-level pressure: 996.8 mb; 29.44 in. Hg: rising, then more rapidly
Visibility: 50 miles, 30 miles WNW-NW
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E40 BKN 65 BKN 100 BKN 50 968/35/22/2821G33/944/ VIRGA DSNT
S-NW-NE VSBY 30 WNW-NW PK WND 2833/47/ 8/520 53021
1 P.M.
Weather: Clear, few stratocumulus all quadrants, few cirrus distant SE-SSW
Temperature: 32F; Dew Point: 6F; Relative Humidity: 32%
Wind: WNW @ 26G42 kts, peak wind WNW 58mph at 12:32 P.M.
Sea-level pressure: 999.6 mb; 29.52 in. Hg: rising, then more rapidly
Visibility: 80 miles
6-hr Max temp: 36F
6-hr Min temp: 32F
6-hr Precip: Trace
6-hr Snowfall: Trace
Snow Depth: 2 inches
BHO SA 1755 CLR 80 996/32/6/2926G42/952/ FEW SC ALQDS FEW CI DSNT SE-SSW
PK WND 2950/32/ TOTAL NEW SNW PST 6 HRS TRACE/ 8/501 4/002 53028 6000/
10036 20032
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SUMMARY FOR MONDAY, JANUARY 27, 2025
TEMPERATURE (DEGREES F)
MAX…….38 NORMAL…..34
MIN…….22 NORMAL…..17
MEAN……30 NORMAL…..26
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+4
TOTAL DEPARTURE FOR THE MONTH…………………….-32 [-1.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………35 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH………….1066 DEPARTURE…….+29
TOTAL HEATING UNITS FOR THE SEASON…………2998 DEPARTURE……-249
TOTAL HEATING UNITS LAST SEASON TO DATE…….2825 DEPARTURE……+173
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)………..38 SW @ 02:47 P.M.
VECTOR #1 (1-Sec)……….40 SW @ 02:47 P.M.
VECTOR #2 (1-Sec)……….40 SSW @ 09:37 P.M.
DAVIS #1……………….38 SW @ 02:48 P.M.
DAVIS #2 ………………39 WSW @ 09:38 P.M.
RMY #1 (Instantaneous)…..42 SW @ 02:47 P.M.
RMY #2 (Instantaneous)…..41 SSW @ 09:37 P.M.
MERLIN…………………38 WSW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 SW @ 08:44 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27 @ 06:51 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27 @ 02:48 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………26 SSW @ 06:52 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 SW @ 02:48 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..26 SW @ 06:51 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 SSW @ 09:59 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..16.1 SW [386 total miles]
VECTOR #1………………15.8
VECTOR #2………………16.2
DAVIS #1……………….15.8 SW
DAVIS #2……………….16.4 WSW
RMY #1…………………15.4 SW
RMY #2…………………16.2 SW
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…..-2.43
TOTAL PRECIPITATION FOR THE YEAR (2025)……..1.52 DEPARTURE…..-2.43
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.7
TOTAL SNOWFALL FOR THE MONTH………………..7.4 DEPARTURE……-8.5
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……20.0 DEPARTURE…..-11.0
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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 30/12/21/-5/0.00/0.0/…/.. 29 SW VEC1 29 SW RMY 30
1/24 32/14/23/-3/0.00/0.0/…/.. 21 W VEC1 22 WNW RMY 22
1/25 29/11/20/-6/0.00/0.0/…/.. 26 W VEC1 26 W RMY 27
1/26 39/21/30/+4/0.00/0.0/…/.. 48 W VEC1 48 W RMY 50
1/27 38/22/30/+4/0.00/0.0/…/.. 38 SW VEC1 40 SW RMY 42
1/28 The low since midnight is 31F, 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 28
HIGH 59F IN 1916
LOW -9F IN 1888, 1924
PRECIP 2.18 INS. IN 1897
SNOWFALL 15.0 INS. IN 1897
PEAK GUST 78e MPH SSE IN 1977
RECORDS FOR JANUARY 29
HIGH 66F IN 2002
LOW -11F IN 1888
PRECIP 1.79 INS. IN 2022
SNOWFALL 21.7 INS. IN 2022
PEAK GUST 72 MPH NW IN 1973
TODAY’S REPORT PREPARED BY: Matt Douglas/Jack Willard
