Sunday, December 29, 2024

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

SUNDAY, DECEMBER 29, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET:  1620E

DENSE FOG CONTINUES WITH “WARMING” TEMPERATURES….

We continue to be stuck in the clouds here on the summit with the
visibility being no more than 1/8th of a mile so far today. Light
rain yesterday into the overnight totaled 0.22″ in the gauge,
with another 0.01″ of light rain falling between 10am and 1pm.

Temperatures have been slowly warming as a warm front pushes
through the area. Readings climbed through the 40s reaching the
low 50s by early this afternoon.

Winds were fairly light through the morning, but have been picking
up some as we push into early afternoon. Flow is out of the south-
southwest, with an average speed of around 8mph. The peak gust for
the day so far occurred around 12:42pm, with a value of 22mph.

The maximum temperature for today is 51F degrees, which is 14 degrees
above the normal high of 37F. The minimum temperature since midnight
is 44F degrees, which is 23 degrees above the normal low of 21F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 44F; Dew Point: 44F; Relative Humidity: 100%
Wind: SSW @ 6 kts, wind light
Sea-level pressure: 1023.0 mb; 30.21 in. Hg: rising, then falling
Visibility: 1/8 mile, fog
6-hr Max temp: 46F
6-hr Min temp: 44F
24-hr Precip:  0.22 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1155 X W2 1/8F 230/44/44/2106/021/ WND LGT/ 8//// 4/001 58001
6002/ 70022 10046 20044

10 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 46F; Dew Point: 46F; Relative Humidity: 100%
Wind: SSW @ 7 kts
Sea-level pressure: 1022.8 mb; 30.20 in. Hg: falling, then steady
Visibility: 1/16 mile, fog
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 1/16F 228/46/46/2107/020/ 8//// 56002

1 P.M.
Weather: Sky obscured, vertical visibility 200ft, light rain
Temperature: 51F; Dew Point: 51F; Relative Humidity: 100%
Wind: SSW @ 11 kts
Sea-level pressure: 1019.6mb; 30.11 in. Hg: falling, then more slowly
Visibility: 1/8 mile, fog
6-hr Max temp: 51F
6-hr Min temp: 44F
6-hr Precip:  0.01 inches
6-hr Snowfall: 0.0 inches
Snow Depth: Trace
BHO SA 1755 X W2 1/18R-F 196/51/51/2111/011/ R-E28B40/ 8//// 4/000
56032 6001/ 10051 20044

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SUMMARY FOR SATURDAY, DECEMBER 28, 2024

TEMPERATURE (DEGREES F)
MAX…….45  NORMAL…..37
MIN…….31  NORMAL…..22
MEAN……38  NORMAL…..29

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+9
TOTAL DEPARTURE FOR THE MONTH……………………-40 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………27  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..937  DEPARTURE…….+39
TOTAL HEATING UNITS FOR THE SEASON…………1880  DEPARTURE……-222
TOTAL HEATING UNITS LAST SEASON TO DATE…….1813  DEPARTURE…….+67

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)………..21 SW   @   03:45 A.M.
VECTOR #1 (1-Sec)……….21 SSW  @   05:15 A.M.
VECTOR #2 (1-Sec)……….20 SSW  @   03:33 P.M.
DAVIS #1……………….22 S    @   03:01 P.M.
DAVIS #2 ………………20 SW   @   03:32 A.M.
RMY #1 (Instantaneous)…..21 SSW  @   05:09 A.M.
RMY #2 (Instantaneous)…..21 SW   @   03:42 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 SW   @   03:36 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16      @   03:05 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16      @   01:33 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 SW   @   03:05 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 SW   @   01:33 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 SW   @   03:05 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 SW   @   03:43 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.2 SW [269 total miles] VECTOR #1………………11.6
VECTOR #2………………11.9
DAVIS #1……………….11.2 SW
DAVIS #2……………….11.8 SW
RMY #1…………………11.5 SW
RMY #2…………………12.2 SW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.22 DEPARTURE…..+0.07
TOTAL PRECIPITATION FOR THE MONTH…………..6.90 DEPARTURE…..+1.99
TOTAL PRECIPITATION FOR THE YEAR (2024)…….54.37 DEPARTURE…..+0.99

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……+1.6
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……12.6 DEPARTURE……-0.9

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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  45/31/38/+9/0.18/0.0/…/..        21 SW  VEC1 21 SSW RMY 21

12/29 The low since midnight is 44F, the daily normal low is 21F.

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DECEMBER DAILY RECORDS TO DATE

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

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

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)

RECORDS FOR DECEMBER 30
HIGH 60 IN 1984
LOW -18 IN 1933
PRECIP 1.54 INS. IN 1942
SNOWFALL 7.5 INS. IN 1956
PEAK GUST 81 MPH WNW IN 1962

TODAY’S REPORT PREPARED BY: Matt Douglas