Tuesday, December 12, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, DECEMBER 12, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0704E
SUNSET: 1612E
ABUNDANT SUNSHINE WITH SEASONABLE TEMPERATURES TODAY….
Clear skies have been the theme today with abundant sunshine making
for a very nice day.
Temperatures are seasonable for this time of year with readings
getting into the low 40s early this afternoon. The dew point is
holding in the mid 20s however, so it does tend to add a slight
chill to the air, especially when the breeze kicks up.
The wind has been fairly steady for the most part, except for a
brief period during the mid to late morning hours where it did go
light for a bit. The average speed for the day thus far is around
11mph. The peak gust for the day occurred at midnight and was
measured at 33mph.
Visibility has been excellent today with the view ranging from
50-70 miles.
The maximum temperature for today is 42F degrees, this is 1 degree
above the normal high of 41F. The minimum temperature since midnight
is 29F degrees, this is 3 degrees above the normal low of 26F.
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus offshore distant NE-SSE and
S-NW
Temperature: 29F; Dew Point: 22F; Relative Humidity: 74%
Wind: WNW @ 12G18 kts
Sea-level pressure: 1025.3 mb; 30.28 in. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 32F
6-hr Min temp: 29F
24-hr Precip: 0.26 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 50 253/29/22/2912G18/028/ FEW SC OFFSHR DSNT NE-SSE
AND S-NW/ 8/500 51028 70026 10032 20029
10 A.M.
Weather: Clear, few stratocumulus all quadrants, few cirrus distant WNW-N
Temperature: 36F; Dew Point: 24F; Relative Humidity: 61%
Wind: W @ 5 kts, wind light
Sea-level pressure: 1028.1 mb; 30.36 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 70 281/36/24/2705/036/ FEW SC ALQDS FEW CI DSNT WNW-N
WND LGT/ 8/501 51028
1 P.M.
Weather: Clear, few stratocumulus all quadrants, few cirrus WNW-N-NE
Temperature: 41F; Dew Point: 25F; Relative Humidity: 51%
Wind: SW @ 9G17 kts
Sea-level pressure: 1027.4 mb; 30.34 in. Hg: rising, then falling
Visibility: 70 miles
6-hr Max temp: 42F
6-hr Min temp: 29F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 70 274/41/25/2209G17/034/ FEW SC ALQDS FEW CI WNW-N-NE/
8/501 58007 10042 20029
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SUMMARY FOR MONDAY, DECEMBER 11, 2023
TEMPERATURE (DEGREES F)
MAX…….61 NORMAL…..41
MIN…….33 NORMAL…..26
MEAN……47 NORMAL…..34
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+13
TOTAL DEPARTURE FOR THE MONTH………………….+47 [+4.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………18 DEPARTURE…….-13
TOTAL HEATING UNITS FOR THE MONTH…………..279 DEPARTURE…….-48
TOTAL HEATING UNITS FOR THE SEASON…………1366 DEPARTURE……-164
TOTAL HEATING UNITS LAST SEASON TO DATE…….1258 DEPARTURE……+108
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)……….E69 SSW @ 02:58 A.M.
VECTOR #1 (1-Sec)……….69 SSW @ 02:49 A.M.
VECTOR #2 (1-Sec)……….69 SSW @ 02:58 A.M.
DAVIS #1……………….83 S @ 02:49 A.M.
DAVIS #2 ………………76 S @ 02:39 A.M.
RMY #1 (Instantaneous)…..71 SSW @ 02:58 A.M.
RMY #2 (Instantaneous)…..72 SSW @ 02:58 A.M.
MERLIN…………………67 SSW
RICHARDS (C5C) (Inst)……69 @ 02:58 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………54 SSW @ 03:02 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..49 @ 03:00 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..52 @ 03:00 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………51 S @ 03:00 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………51 SSW @ 03:00 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..49 SSW @ 02:59 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..52 SSW @ 03:00 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………48 @ 02:59 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….19.0 WNW [456 total miles]
VECTOR #1……………..18.2
VECTOR #2……………..19.7
DAVIS #1………………18.8 W
DAVIS #2………………19.5 WNW
RMY #1………………..17.6 WNW
RMY #2………………..19.3 WNW
RICHARDS (C5C)…………18.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.26 DEPARTURE…..+0.08
TOTAL PRECIPITATION FOR THE MONTH…………..3.50 DEPARTURE…..+1.53
TOTAL PRECIPITATION FOR THE YEAR…………..54.87 DEPARTURE…..+4.43
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH………………..0.3 DEPARTURE……-3.0
TOTAL SNOWFALL FOR THE SEASON (2023-2024)…….0.3 DEPARTURE……-5.5
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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/…/.. 18 NNW VEC1 18 NW RMY 19
12/8 42/24/33/-2/0.00/0.0/…/.. 20 S VEC1 18 S RMY 18
12/9 52/33/43/+9/0.00/0.0/…/.. 24 S VEC1 24 S RMY 24
12/10 60/43/52/+18/0.66/0.0/…/.. 55 SSW VEC1 54 SSW RMY 53
12/11 61/33/47/+13/1.96/0.0/…/.. 69 SSW VEC1 69 SSW RMY 71
12/12 The low since midnight is 29F, the daily normal low is 26F
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DECEMBER DAILY RECORDS TO DATE
NONE…
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 12
HIGH 67 IN 1979
LOW -3 IN 1988
PRECIP 3.94 INS. IN 1992
SNOWFALL 20.3 INS. IN 1960
PEAK GUST 75 MPH SSE IN 2008
RECORDS FOR DECEMBER 13
HIGH 60 IN 1984
LOW 0 IN 1893
PRECIP 1.45 INS. IN 1983
SNOWFALL 9.2 INS. IN 2007
PEAK GUST 81e WNW IN 1976
TODAY’S REPORT PREPARED BY: Matt Douglas
