Wednesday, December 27, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, DECEMBER 27, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0712E
SUNSET: 1618E
CLOUDS AND PERIODS OF FOG DOMINATE TODAY AS WE AWAIT MORE RAIN….
We started the day once again with an undercast. This undercast
did lift during the mid morning hours shrouding the Hill in fog
for a time. By early this afternoon the fog has lifted, but an
overcast deck is left behind as our next system approaches.
Temperatures have been gradually rising through the 40s, with
readings reaching near 50F early this afternoon.
The wind was a bit busy overnight, but has become quite light as
we move through the daylight hours. The average speed for the day
is around 8mph, however for the past couple of hours, the average
has only been around 4-5mph. The peak gust for the day so far
occurred just before 1am and was 18mph.
Visibility has been variable again today. We could see 40 miles
above the undercast early this morning, but then dropped to less
than 1/4 mile for a time later this morning as the undercast lifted.
It has improved to around 50 miles early this afternoon however
in most quadrants, however it’s still limited in areas where fog
continues to linger.
The maximum temperature so far today is 50F degrees, this is 13
degrees above the normal high of 37F. The minimum temperature since
midnight is 39F degrees, this is 17 degrees above the normal low
of 22F.
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Today’s Observations:
7 A.M.
Weather: Broken undercast, broken altocumulus/altostratus, overcast
cirrostratus, few thin spots in overcast ENE-SSE
Temperature: 43F; Dew Point: 43F; Relative Humidity: 99%
Wind: SW @ 9 kts
Sea-level pressure: 1021.6 mb; 30.17 in. Hg: falling, then steady
Visibility: 40 miles (above undercast)
6-hr Max temp: 44F
6-hr Min temp: 39F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 ///BKN E120 BKN 200 OVC 40 216/43/43/2309/017/ PARTIAL
UNDERCAST ALQDS FEW THN SPTS IOVC ENE-SSE/ 8/677 56003 10044 20039
10 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 45F; Dew Point: 45F; Relative Humidity: 98%
Wind: SSW @ 4 kts, wind light
Sea-level pressure: 1021.5 mb; 30.16 in. Hg: rising, then falling
Visibility: 1/4 mile, fog
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 1/4F 215/45/45/2104/016/ WND LGT/ 8//// 58001
1 P.M.
Weather: Broken stratus, broken stratocumulus, overcast altocumulus/
altostratus, fog bank ENE-S and WSW
Temperature: 49F; Dew Point: 48F; Relative Humidity: 95%
Wind: W @ 3 kts, wind light
Sea-level pressure: 1019.2 mb; 30.10 in. Hg: falling, then more rapidly
Visibility: 50 miles, 8 miles ENE-S and WSW
6-hr Max temp: 50F
6-hr Min temp: 43F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E10 BKN 40 BKN 90 OVC 50 192/49/48/2603/010/ F BNK ENE-S
AND WSW VSBY 8 ENE-S AND WSW WND LGT/ 8/67/ 58023 10050 20043
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SUMMARY FOR TUESDAY, DECEMBER 26, 2023
TEMPERATURE (DEGREES F)
MAX…….52 NORMAL…..38
MIN…….32 NORMAL…..22
MEAN……42 NORMAL…..30
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+12
TOTAL DEPARTURE FOR THE MONTH…………………+143 [+5.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………23 DEPARTURE…….-12
TOTAL HEATING UNITS FOR THE MONTH…………..683 DEPARTURE……-144
TOTAL HEATING UNITS FOR THE SEASON…………1770 DEPARTURE……-261
TOTAL HEATING UNITS LAST SEASON TO DATE…….1788 DEPARTURE…….-18
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)……….E18 SW @ 09:56 P.M.
VECTOR #1 (1-Sec)……….18 SW @ 09:29 P.M.
VECTOR #2 (1-Sec)……….19 SW @ 09:29 P.M.
DAVIS #1……………….17 S @ 05:59 P.M.
DAVIS #2 ………………19 S @ 06:00 P.M.
RMY #1 (Instantaneous)…..19 SW @ 09:29 P.M.
RMY #2 (Instantaneous)…..19 SW @ 09:28 P.M.
MERLIN…………………18 SW
RICHARDS (C5C) (Inst)……16 @ 09:40 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 SSW @ 10:28 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 09:57 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 09:57 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 SSW @ 09:57 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 SW @ 09:57 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SW @ 10:56 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 SW @ 09:57 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………13 @ 09:40 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….6.0 SSW [145 total miles]
VECTOR #1……………..6.8
VECTOR #2……………..6.8
DAVIS #1………………6.3 SSW
DAVIS #2………………6.4 SSW
RMY #1………………..6.7 SSW
RMY #2………………..6.9 SSW
RICHARDS (C5C)…………7.0
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..6.46 DEPARTURE…..+1.86
TOTAL PRECIPITATION FOR THE YEAR…………..57.83 DEPARTURE…..+4.76
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH………………..0.3 DEPARTURE……-9.7
TOTAL SNOWFALL FOR THE SEASON (2023-2024)…….0.3 DEPARTURE…..-12.2
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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/…/.. 18 NNW VEC1 18 NNW RMY 19
12/23 42/26/34/+3/0.00/0.0/…/.. 18 SSW VEC1 18 SSW RMY 16
12/24 46/35/41/+11/0.01/0.0/…/.. 16 SE VEC1 16 SE RMY 16
12/25 53/41/47/+17/0.01/0.0/…/.. 15 ENE VEC1 15 SE RMY 14
12/26 52/32/42/+12/0.00/0.0/…/.. 18 SW VEC1 18 SW RMY 19
12/27 The low since midnight is 39F, the daily normal low is 22F
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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 27
HIGH 57 IN 1895,1949
LOW -4 IN 1903
PRECIP 2.43 INS. IN 1969
SNOWFALL 11.2 INS. IN 1947
PEAK GUST 73 S IN 2011
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
TODAY’S REPORT PREPARED BY: Matt Douglas
