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Saturday, December 28, 2024

December 28, 2024

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, DECEMBER 28, 2024 ALL TIMES ARE…

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

SATURDAY, DECEMBER 28, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET:  1619E

CHILLY WITH LIGHT RAIN AND DENSE FOG….

Light rain began falling here before sunrise this morning. Luckily, the
temperature surpassed the freezing mark by 2am, meaning we were spared any
freezing rain. The intensity of the rainfall has been rather light, and
we have only picked up 0.18″ by 1pm.

Temperatures reached a low of 31F just after midnight before beginning to
slowly climb. We are now in the low 40s. The dew point lagged behind a bit
until the air became saturated around 8am this morning.

Winds have been steady but light. Flow is out of the south-southwest, with an
average speed of 12mph. The peak gust occurred around 3:45am this morning,
at 21mph.

Visibility started out poor, with low clouds and light rain limiting views
to 8 miles. Since then, the combination of the rain and melting snow has
resulted in dense fog on the summit, reducing visibility to 1/8 mile and
below.

The maximum temperature for today is 41F degrees, which is 4 degrees
above the normal high of 37F. The minimum temperature since midnight
is 31F degrees, which is 9 degrees above the normal low of 22F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Very light rain, broken stratus fractus, overcast nimbostratus
Temperature: 35F; Dew Point: 34F; Relative Humidity: 95%
Wind: SSW @ 10G15 kts
Sea-level pressure: 1026.1 mb; 30.30 in. Hg: falling, then rising
Visibility: 8 miles, thin fog all quadrants
6-hr Max temp: 35F
6-hr Min temp: 31F
24-hr Precip:  Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 6 inches
BHO SA 1155 E20 BKN E36 OVC 8R- 261/35/34/2110G15/030/ THN F ALQDS
PCPN VRY LGT/ 8/72/ 4/006 55006 70000 10035 20031

10 A.M.
Weather: Light rain and fog, sky obscured, vertical visibility 200ft
Temperature: 38F; Dew Point: 38F; Relative Humidity: 100%
Wind: SW @ 10G15 kts
Sea-level pressure: 1026.5 mb; 30.31 in. Hg: rising, then steady
Visibility: 1/8 mile, fog
3-hr Precip:  0.11 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 1/8R-F 265/38/38/2210G15/031/ 8//// 51004 6011/

1 P.M.
Weather: Very light rain and fog, sky obscured, vertical visibility 200ft
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: SSW @ 11G16 kts
Sea-level pressure: 1024.0 mb; 30.24 in. Hg: falling unsteadily
Visibility: 1/16 mile, fog
6-hr Max temp: 41F
6-hr Min temp: 35F
6-hr Precip:  0.18 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 5 inches
BHO SA 1755 X W2 1/16R-F 240/40/40/2111G16/024/ PCPN VRY LGT/ 8//// 4/005
57025 6018/ 10041 20035

————————————————————–

SUMMARY FOR FRIDAY, DECEMBER 27, 2024

TEMPERATURE (DEGREES F)
MAX…….42  NORMAL…..37
MIN…….21  NORMAL…..22
MEAN……32  NORMAL…..30

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+2
TOTAL DEPARTURE FOR THE MONTH……………………-49 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………33  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………..910  DEPARTURE…….+48
TOTAL HEATING UNITS FOR THE SEASON…………1853  DEPARTURE……-213
TOTAL HEATING UNITS LAST SEASON TO DATE…….1790  DEPARTURE…….+63

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 SSW  @   05:08 P.M.
VECTOR #1 (1-Sec)……….20 SSW  @   05:08 P.M.
VECTOR #2 (1-Sec)……….21 SSW  @   05:08 P.M.
DAVIS #1……………….19 S    @   05:17 P.M.
DAVIS #2 ………………20 SSW  @   05:08 P.M.
RMY #1 (Instantaneous)…..21 SSW  @   05:08 P.M.
RMY #2 (Instantaneous)…..21 SSW  @   05:08 P.M.
MERLIN…………………19 SW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 SW   @   11:50 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15      @   11:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15      @   11:16 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 SW   @   11:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 SW   @   11:56 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 SW   @   11:57 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 SW   @   11:53 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.8 SW [187 total miles] VECTOR #1……………….8.3
VECTOR #2……………….8.6
DAVIS #1………………..8.0 WSW
DAVIS #2………………..8.3 WSW
RMY #1………………….8.3 WSW
RMY #2………………….8.7 WSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..6.68 DEPARTURE…..+1.92
TOTAL PRECIPITATION FOR THE YEAR (2024)…….54.15 DEPARTURE…..+0.92

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH……………….12.6 DEPARTURE……+2.1
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……12.6 DEPARTURE……-0.4

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/1   37/23/30/-7/0.00/0.0/452/81        21 WSW VEC1 21 WSW RMY 21
12/2   38/22/30/-7/0.00/0.0/551/99        18 W   VEC1 18 W   RMY 18
12/3   36/20/28/-8/0.00/0.0/411/74        21 NW  VEC1 21 WNW RMY 21
12/4   39/22/31/-5/0.13/T/394/71          30 S   VEC1 31 S   RMY 33
12/5   37/31/34/-2/0.40/3.0/072/13        43 WNW VEC1 43 WNW RMY 47
12/6   31/23/27/-8/0.00/0.0/514/93        39 NW  VEC1 39 W   RMY 42
12/7   37/22/30/-5/T/T/408/74             25 S   VEC1 25 S   RMY 26
12/8   47/28/38/+3/0.02/T/198/36          37 SSW VEC1 37 SSW RMY 40
12/9   47/34/41/+7/0.41/0.0/187/34        28 ENE VEC1 28 E   RMY 29
12/10  42/31/37/+3/0.15/0.0/000/00        31 NE  VEC1 32 NE  RMY 34
12/11  62/36/49/+15/3.38/0.0/000/00       65 SSW VEC1 67 SSW RMY 70 TSTM
12/12  53/25/39/+5/0.05/0.0/460/84        51 WNW VEC1 49 WNW RMY 51
12/13  31/19/25/-8/0.00/0.0/514/94        30 WNW VEC1 30 W   RMY 30
12/14  33/17/25/-8/0.00/0.0/546/100       20 NW  VEC1 19 NNW RMY 20
12/15  34/17/26/-7/0.00/0.0/377/69        17 N   VEC1 17 N   RMY 16
12/16  45/29/37/+5/T/0.0/005/01           35 SSE VEC1 35 SSE RMY 35
12/17  59/41/50/+18/0.25/0.0/360/66       48 SSW VEC1 50 SSW RMY 50
12/18  50/36/43/+11/0.57/0.0/507/93       21 S   VEC1 21 S   RMY 21
12/19  44/30/37/+5/0.13/0.0/425/78        31 NW  VEC1 31 NW  RMY 32
12/20  32/24/28/-3/1.17/9.4/000/00        28 NNE VEC1 29 N   RMY 29
12/21  26/12/19/-12/0.00/0.0/262/48       38 NW  VEC1 38 NW  RMY 41
12/22  17/6/12/-19/0.00/0.0/544/100       33 NW  VEC1 33 NW  RMY 35
12/23  26/4/15/-16/0.00/0.0/420/77        21 S   VEC1 21 SSW RMY 20
12/24  31/19/25/-5/0.02/0.2/082/15        29 WSW VEC1 29 WSW RMY 30
12/25  31/20/26/-4/0.00/0.0/540/99        18 NNW VEC1 19 NNW RMY 21
12/26  38/23/31/+1/0.00/0.0/…/..        15 N   VEC1 15 N   RMY 15
12/27  42/21/32/+2/0.00/0.0/…/..        20 SSW VEC1 20 SSW RMY 21

12/28 The low since midnight is 31F, the daily normal low is 22F.

————————————————————–

DECEMBER DAILY RECORDS TO DATE

12/11 NEW PRECIPITATION RECORD OF 3.38″; OLD RECORD 2.36″ IN 1992

————————————————————–

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

RECORDS FOR DECEMBER 28
HIGH 60 IN 1982
LOW -2 IN 1933
PRECIP 2.16 INS. IN 1967
SNOWFALL 9.5 INS. IN 1967
PEAK GUST 89 MPH SSE IN 1983

RECORDS FOR DECEMBER 29
HIGH 72 IN 1984
LOW -19 IN 1933 (RECORD FOR DECEMBER)
PRECIP 1.89 INS. IN 1945
SNOWFALL 18.4 INS. IN 1945
PEAK GUST 95 MPH S IN 1966 (RECORD FOR DECEMBER)

TODAY’S REPORT PREPARED BY: Joshua Polen

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