Sunday, December 31, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, DECEMBER 31, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0713E
SUNSET: 1621E
DRIER CONDITIONS TODAY, BUT STILL OVERCAST AND CHILLY….
We have finally gotten rid of the wet weather, however clouds
continue to dominate the sky. As a matter of fact, we have not
recorded any sunshine since Tuesday, however it appears we’ll
finally see some this afternoon as breaks are starting to
develop in the overcast deck and splashes of sunshine can be
seen across the landscape in spots.
Temperatures are on the chilly side as a colder air mass has moved
into the region. Readings have only made it to the mid 30s early
this afternoon, which for a change, is close to normal.
The wind has been mainly on the light side with an average speed
of around 7mph. Our peak gust so far is around 20mph, occurring
just after 7am this morning.
Visibility is very decent today with views of 60-70 miles.
The maximum temperature so far today is 35F degrees, this is 1
degree below the normal high of 36F. The minimum temperature since
midnight is 31F degrees, this is 10 degrees above the normal low
of 21F.
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Today’s Observations:
7 A.M.
Weather: Overcast stratocumulus, few breaks in overcast distant N-ESE
Temperature: 32F; Dew Point: 26F; Relative Humidity: 79%
Wind: NW @ 8 kts
Sea-level pressure: 1012.2 mb; 29.89 in. Hg: rising, then more rapidly
Visibility: 60 miles
6-hr Max temp: 32F
6-hr Min temp: 32F
24-hr Precip: 0.06 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E30 OVC 60 122/32/26/3208/989/ FEW BINOVC DSNT N-ESE/
8/5// 53020 70006 10032 20032
10 A.M.
Weather: Overcast stratocumulus, few breaks in overcast distant NW
Temperature: 33F; Dew Point: 25F; Relative Humidity: 71%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1013.8 mb; 29.94 in. Hg: rising, then more rapidly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E26 OVC 70 138/33/25/3005/994/ FEW BINOVC DSNT NW WND LGT/
8/5// 53016
1 P.M.
Weather: Broken stratocumulus
Temperature: 34F; Dew Point: 25F; Relative Humidity: 67%
Wind: WNW @ 7 kts
Sea-level pressure: 1012.8 mb; 29.91 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 35F
6-hr Min temp: 31F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E30 BKN 70 128/34/25/3007/991/ 8/500 58010 10035 20031
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SUMMARY FOR SATURDAY, DECEMBER 30, 2023
TEMPERATURE (DEGREES F)
MAX…….43 NORMAL…..37
MIN…….32 NORMAL…..21
MEAN……38 NORMAL…..29
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..+9
TOTAL DEPARTURE FOR THE MONTH…………………+182 [+6.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………27 DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..777 DEPARTURE……-193
TOTAL HEATING UNITS FOR THE SEASON…………1864 DEPARTURE……-310
TOTAL HEATING UNITS LAST SEASON TO DATE…….1894 DEPARTURE…….-30
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated
F420C (Official)……….E24 WNW @ 02:47 P.M.
VECTOR #1 (1-Sec)……….24 WNW @ 02:47 P.M.
VECTOR #2 (1-Sec)……….27 WNW @ 02:48 P.M.
DAVIS #1……………….24 W @ 02:47 P.M.
DAVIS #2 ………………25 WNW @ 02:48 P.M.
RMY #1 (Instantaneous)…..24 WNW @ 02:47 P.M.
RMY #2 (Instantaneous)…..26 WNW @ 02:48 P.M.
MERLIN…………………21 WNW
RICHARDS (C5C) (Inst)……25 @ 02:47 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 WNW @ 02:57 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 @ 02:49 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 02:53 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 W @ 02:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 WNW @ 02:53 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 NW @ 03:25 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 WNW @ 02:53 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16 @ 02:49 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.8 WNW [212 total miles]
VECTOR #1……………..9.1
VECTOR #2……………..9.9
DAVIS #1………………9.3 WNW
DAVIS #2………………9.2 NW
RMY #1………………..8.8 WNW
RMY #2………………..9.7 WNW
RICHARDS (C5C)…………9.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.06 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH…………..7.33 DEPARTURE…..+2.10
TOTAL PRECIPITATION FOR THE YEAR…………..58.70 DEPARTURE…..+5.00
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH………………..0.3 DEPARTURE…..-11.8
TOTAL SNOWFALL FOR THE SEASON (2023-2024)…….0.3 DEPARTURE…..-14.3
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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 51/38/45/+8/0.04/0.0/213/38 29 SW VEC1 28 SW RMY 29
12/2 48/43/46/+9/T/0.0/000/00 18 SSW VEC1 19 SSW RMY 19
12/3 44/41/43/+7/0.76/0.0/000/00 31 ENE VEC1 32 ENE RMY 33
12/4 49/37/43/+7/0.07/0.0/155/28 23 W VEC1 22 W RMY 23
12/5 38/28/33/-3/0.00/0.0/144/26 23 NNW VEC1 24 NW RMY 24
12/6 34/22/28/-7/0.01/0.3/100/18 21 N VEC1 21 N RMY 20
12/7 28/17/56/-12/0.00/0.0/121/22 18 NNW VEC1 18 NW RMY 19
12/8 42/24/33/-2/0.00/0.0/530/96 20 S VEC1 18 S RMY 18
12/9 52/33/43/+9/0.00/0.0/264/48 24 S VEC1 24 S RMY 24
12/10 60/43/52/+18/0.66/0.0/033/06 55 SSW VEC1 54 SSW RMY 53
12/11 61/33/47/+13/1.96/0.0/038/07 69 SSW VEC1 69 SSW RMY 71
12/12 42/29/36/+2/0.00/0.0/543/99 33 WNW VEC1 32 WNW RMY 34
12/13 43/28/36/+3/0.00/0.0/470/86 36 WNW VEC1 34 WNW RMY 36
12/14 34/22/28/-5/0.00/0.0/520/95 31 SW VEC1 31 SW RMY 32
12/15 53/30/42/+9/0.00/0.0/541/99 31 WNW VEC1 30 WNW RMY 28
12/16 50/36/43/+11/0.00/0.0/530/97 21 ESE VEC1 22 ESE RMY 22
12/17 55/37/46/+14/0.47/0.0/098/18 40 SSE VEC1 41 SSE RMY 41
12/18 61/42/52/+20/2.47/0.0/000/00 90 SSE VEC1 95 SSE RMY 101
12/19 46/30/38/+6/0.00/0.0/332/61 28 NW VEC1 28 NW RMY 26
12/20 41/26/34/+3/0.00/0.0/540/99 26 NNW VEC1 27 NNW RMY 28
12/21 34/20/27/-4/0.00/0.0/534/98 29 NNW VEC1 30 NNW RMY 28
12/22 34/16/25/-6/0.00/0.0/540/99 18 NNW VEC1 18 NNW RMY 19
12/23 42/26/34/+3/0.00/0.0/414/76 18 SSW VEC1 18 SSW RMY 16
12/24 46/35/41/+11/0.01/0.0/000/00 16 SE VEC1 16 SE RMY 16
12/25 53/41/47/+17/0.01/0.0/409/75 15 ENE VEC1 15 SE RMY 14
12/26 52/32/42/+12/0.00/0.0/245/45 18 SW VEC1 18 SW RMY 19
12/27 52/39/45/+15/0.02/0.0/000/00 18 SW VEC1 18 SW RMY 19
12/28 44/39/42/+13/0.72/0.0/000/00 40 NE VEC1 41 NE RMY 40
12/29 44/38/41/+12/0.06/0.0/000/00 18 N VEC1 18 N RMY 19
12/30 43/32/38/+9/0.07/0.0/000/00 24 WNW VEC1 24 WNW RMY 24
12/31 The low since midnight is 31F, the daily normal low is 21F
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DECEMBER DAILY RECORDS TO DATE
12/18: RECORD MAXIMUM TEMPERATURE OF 61F;
BEATS OLD RECORD OF 59F SET IN 1928
12/18: RECORD PRECIPITATION OF 2.47 INS;
BEATS OLD RECORD OF 1.44 INS SET IN 1915
12/18: RECORD PEAK WIND GUST OF 90 MPH;
BEATS OLD RECORD OF 76e MPH SET IN 1978
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 31
HIGH 62 IN 1965
LOW -12 IN 1917
PRECIP 0.96 INS. IN 1906
SNOWFALL 7.5 INS. IN 2008
PEAK GUST 78 MPH NW IN 1990
RECORDS FOR JANUARY 1
HIGH 58F IN 1966
LOW -6F IN 1918
PRECIP 1.45 INS. IN 1982
SNOWFALL 7.2 INS. IN 1938
PEAK GUST 90e MPH S IN 1945
TODAY’S REPORT PREPARED BY: Matt Douglas
