Tuesday, December 26, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, DECEMBER 26, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0712E
SUNSET: 1617E
COMPLETE UNDERCAST THIS MORNING, NOW LIFTING EARLY THIS AFTERNOON….
We were treated to a complete undercast this morning, which actually
lasted all morning. It’s not often we get to see an undercast here,
but its even more rare for one to last for several hours. We had
sunshine for a time this morning, but now as the undercast is lifting,
we are in the clouds early this afternoon with very low visibility.
The temperature has warmed into the mid 40s early this afternoon,
which is still above normal for the date.
The wind continues to be quite light with an average speed so far
for the day of around 4-5mph. The direction has been rather variable,
but is trying to come mainly from a southerly direction. The peak
gust, if you want to call it that, to this point has only been around
11mph, which occurred right around 9:30am this morning.
Visibility has been variable today as the top of the undercast did
attempt to lift a bit during the mid morning hours. It has been as
low as 1/16 of a mile, but as much as 40 miles (above the undercast).
Now early this afternoon we’re in the clouds (fog) and it’s back
down to around 1/4 of a mile.
The maximum temperature so far today is 47F degrees, this is 9
degrees above the normal high of 38F. The minimum temperature since
midnight is 32F degrees, this is 10 degrees above the normal low
of 22F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Sky partially obscured, thin scattered cirrus,
undercast visible E-SE
Temperature: 34F; Dew Point: 34F; Relative Humidity: 100%
Wind: S @ 5 kts, wind light and variable
Sea-level pressure: 1027.9 mb; 30.35 in. Hg: falling, then steady
Visibility: 1/8 mile, 2 miles E-SE
6-hr Max temp: 42F
6-hr Min temp: 32F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 -X 250 -SCT 1/8F 279/34/34/1805/035/ UNDERCAST VSBL E-SE
VSBY 2 E-SE WND L/V/ 8/601 56002 10042 20032
10 A.M.
Weather: Complete undercast, thin broken cirrus
Temperature: 44F; Dew Point: 43F; Relative Humidity: 96%
Wind: WSW @ 4 kts, wind light and variable
Sea-level pressure: 1028.1 mb; 30.36 in. Hg: rising, then steady
Visibility: 40 miles (above undercast)
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 ///OVC 250 -SCT 40 281/44/43/2404/036/ UNDERCAST ALQDS
WND L/V/ 8/601 51002
1 P.M.
Weather: Sky obscured, vertical visibility 200ft, sun dimly visible
Temperature: 45F; Dew Point: 44F; Relative Humidity: 96%
Wind: SSW @ 4 kts, wind light
Sea-level pressure: 1025.5 mb; 30.28 in. Hg: falling, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 47F
6-hr Min temp: 33F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 X W2 1/4F 255/45/44/2004/028/ SUN DMLY VSBL WND LGT/
8//// 58026 10047 20033
————————————————————–
SUMMARY FOR MONDAY, DECEMBER 25, 2023
TEMPERATURE (DEGREES F)
MAX…….53 NORMAL…..38
MIN…….41 NORMAL…..22
MEAN……47 NORMAL…..30
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+17
TOTAL DEPARTURE FOR THE MONTH…………………+131 [+5.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………18 DEPARTURE…….-17
TOTAL HEATING UNITS FOR THE MONTH…………..660 DEPARTURE……-132
TOTAL HEATING UNITS FOR THE SEASON…………1747 DEPARTURE……-248
TOTAL HEATING UNITS LAST SEASON TO DATE…….1747 DEPARTURE………0
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)……….E15 ENE @ 05:25 P.M.
VECTOR #1 (1-Sec)……….15 SE @ 01:05 A.M.
VECTOR #2 (1-Sec)……….14 ENE @ 05:08 P.M.
DAVIS #1……………….15 SSE @ 02:02 A.M.
DAVIS #2 ………………14 SE @ 01:15 A.M.
RMY #1 (Instantaneous)…..14 ENE @ 05:06 P.M.
RMY #2 (Instantaneous)…..15 ENE @ 05:08 P.M.
MERLIN…………………13 ENE
RICHARDS (C5C) (Inst)……14 @ 01:58 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………11 SSE @ 02:10 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..11 @ 02:04 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 @ 05:01 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………11 ENE @ 05:27 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 SE @ 01:21 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..11 NE @ 04:31 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..12 NE @ 05:01 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………11 @ 02:04 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….6.1 SE [147 total miles]
VECTOR #1……………..6.7
VECTOR #2……………..7.3
DAVIS #1………………6.7 ESE
DAVIS #2………………7.0 ESE
RMY #1………………..6.6 E
RMY #2………………..7.3 ESE
RICHARDS (C5C)…………7.3
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…..+2.03
TOTAL PRECIPITATION FOR THE YEAR…………..57.83 DEPARTURE…..+4.93
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……-9.2
TOTAL SNOWFALL FOR THE SEASON (2023-2024)…….0.3 DEPARTURE…..-11.7
————————————————————–
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 The low since midnight is 32F, the daily normal low is 22F
————————————————————–
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
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 26
HIGH 58 IN 1973,1982
LOW -12 IN 1980
PRECIP 3.64 INS. IN 1969
SNOWFALL 17.5 INS. IN 1909
PEAK GUST 84 MPH SSE IN 1957
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
TODAY’S REPORT PREPARED BY: Matt Douglas
