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Friday, January 31, 2025

January 31, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, JANUARY 31, 2025 ALL TIMES ARE…

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

FRIDAY, JANUARY 31, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0658E
SUNSET:  1657E

LOW PRESSURE SYSTEM BRINGS WARMER TEMPERATURES,
RAIN TO BLUE HILL…

The sky has remained overcast all day, and with the addition of
precipitation we have added fog to the mix. Today has felt like a
raw, chilly spring day instead of winter, thanks to the warm air
advection that warmed us up briefly ahead of the rain arrival.

Temperatures have been much warmer than previously this week, which
has started to thaw some of the snow up here at the summit. When the
rain started during the late morning hours, it slowed the rise of the
temperatures, but we have hit above average for the day.

Winds shifted from the WNW to SSW yesterday evening and have stayed
in the southerly direction today, bringing the warmer moist air to
our area. The speeds have been averaging around 17mph for the day
so far, with frequent gusts of 20-25mph occurring throughout the day.
The peak gust so far of 30mph occurred around 7:30am.

Visibility has been poor, with 30 miles at the start of the day
through the mid morning. Once the rain moved in, we experienced some
foggy conditions that took us to only 1/4 mile of visibility.

The maximum temperature for today is 40F degrees, which is 5 degrees
above the normal high of 35F. The minimum temperature since midnight
is 23F degrees, which is 6 degrees above the normal low of 17F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast cirrostratus, few altocumulus all quadrants
Temperature: 31F; Dew Point: 30F; Relative Humidity: 95%
Wind: SSW @ 16G22 kts
Sea-level pressure: 1016.8 mb; 30.03 in. Hg: falling unsteadily
Visibility: 30 miles
6-hr Max temp: 32F
6-hr Min temp: 23F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1155 E180 OVC 30 168/31/30/2016G22/003/ FEW AC ALQDS/ 8/057
57026 10032 20023

10 A.M.
Weather: Overcast altostratus, few stratus fractus ENE-E-SSE
Temperature: 39F; Dew Point: 37F; Relative Humidity: 93%
Wind: SW @ 18G24 kts
Sea-level pressure: 1014.7 mb; 29.96 in. Hg: falling, then more slowly
Visibility: 30 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E90 BKN 130 OVC 30 147/39/37/2118G24/996/ FEW STFRA
ENE-E-SSE/ 8/67/ 56021

1 P.M.
Weather: Rain, sky obscured, vertical visibility 200 ft
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: SW @ 11 kts
Sea-level pressure: 1010.2 mb; 29.83 in. Hg: falling, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 40F
6-hr Min temp: 31F
6-hr Precip:  0.10 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1755 X W2 1/4R-F 102/40/40/2111/983/ PRESFR/ 8//// 4/001 58045
6010/ 10040 20031

————————————————————–

SUMMARY FOR THURSDAY, JANUARY 30, 2025

TEMPERATURE (DEGREES F)
MAX…….26   NORMAL…..35
MIN…….16   NORMAL…..17
MEAN……21   NORMAL…..26

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-5
TOTAL DEPARTURE FOR THE MONTH…………………….-27 [-1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………44  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH………….1178  DEPARTURE…….+24
TOTAL HEATING UNITS FOR THE SEASON…………3110  DEPARTURE……-254
TOTAL HEATING UNITS LAST SEASON TO DATE…….2929  DEPARTURE……+181

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 WNW  @   01:22 P.M.
VECTOR #1 (1-Sec)……….35 NW   @   02:30 P.M.
VECTOR #2 (1-Sec)……….38 W    @   01:22 P.M.
DAVIS #1……………….35 W    @   01:59 P.M.
DAVIS #2 ………………39 W    @   01:22 P.M.
RMY #1 (Instantaneous)…..35 WNW  @   01:22 P.M.
RMY #2 (Instantaneous)…..40 W    @   01:22 P.M.
MERLIN…………………34 W
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 WNW  @   01:55 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25      @   01:55 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25      @   01:55 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 W    @   01:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 WNW  @   01:23 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 WNW  @   01:55 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 WNW  @   01:55 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..13.5 WNW [323 total miles] VECTOR #1………………13.3
VECTOR #2………………14.2
DAVIS #1……………….13.7 WNW
DAVIS #2……………….14.1 WNW
RMY #1…………………12.8 WNW
RMY #2…………………13.9 W
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..1.56 DEPARTURE…..-2.80
TOTAL PRECIPITATION FOR THE YEAR (2025)……..1.56 DEPARTURE…..-2.80

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.7
TOTAL SNOWFALL FOR THE MONTH………………..8.4 DEPARTURE……-9.5
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……21.0 DEPARTURE…..-12.0

————————————————————–

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/-5/0.00/0.0/413/71        29 SW  VEC1 29 SW  RMY 30
1/24   32/14/23/-3/0.00/0.0/507/87        21 W   VEC1 22 WNW RMY 22
1/25   29/11/20/-6/0.00/0.0/504/86        26 W   VEC1 26 W   RMY 27
1/26   39/21/30/+4/0.00/0.0/453/77        48 W   VEC1 48 W   RMY 50
1/27   38/22/30/+4/0.00/0.0/590/100       38 SW  VEC1 40 SW  RMY 42
1/28   36/22/29/+3/T/T/504/85             65 WNW VEC1 65 WNW RMY 68
1/29   47/19/33/+7/0.04/1.0/250/42        56 WNW VEC1 56 WNW RMY 59
1/30   26/16/21/-5/T/T/585/98             35 WNW VEC1 35 NW  RMY 35

1/31 The low since midnight is 23F, the daily normal low is 17F.

————————————————————–

JANUARY DAILY RECORDS TO DATE

NONE.

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR JANUARY 31
HIGH 58F IN 1947, 2013
LOW -12F IN 1920
PRECIP 1.03 INS. IN 1914
SNOWFALL 9.0 INS. IN 1898
PEAK GUST 75 MPH NW IN 1974

RECORDS FOR FEBRUARY 1
HIGH 65F IN 1989
LOW -9F IN 1920
PRECIP 1.86 INS. IN 2021
SNOWFALL 12.7 INS. IN 2021
PEAK GUST 66e MPH SSW IN 1951

TODAY’S REPORT PREPARED BY: Amanda Joly

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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