Saturday, December 14, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, DECEMBER 14, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0706E
SUNSET: 1612E
REMAINING COLD, SUNNY WITH HIGH PRESSURE IN CONTROL….
Clear skies and abundant sunshine have been the theme today
due to a rather strong area of high pressure building in. The only
clouds visible have been stratocumulus located well offshore.
We began the morning in the upper teens, which is the coldest morning of
the season thus far. Following sunrise, temperatures have risen to the low
30s. The air remains dry, with dew points holding in the low to mid teens.
Winds have become lighter as the day has progressed. The average to this
point is 10mph, currently out of the northwest. Our peak gust so far occurred
around 5am, with a speed of 19mph.
Visibility began at 50 miles due to an inversion, but rose to 70 miles
once the inversion mixed out.
The maximum temperature for today is 32F degrees, which is 9
degrees below the normal high of 41F. The minimum temperature
since midnight is 17F degrees, which is 8 degrees below the
normal low of 25F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus distant NE-SSW
Temperature: 18F; Dew Point: 12F; Relative Humidity: 77%
Wind: NNW @ 10G15 kts
Sea-level pressure: 1046.2 mb; 30.89 in. Hg: rising, then more rapidly
Visibility: 50 miles
6-hr Max temp: 18F
6-hr Min temp: 17F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 50 462/18/12/3310G15/089/ FEW SC DSNT NE-SSW/ 8/500 53018
10018 20017
10 A.M.
Weather: Clear, few stratocumulus offshore distant ENE-S
Temperature: 27F; Dew Point: 14F; Relative Humidity: 58%
Wind: NNW @ 8G14 kts
Sea-level pressure: 1047.5 mb; 30.93 in. Hg: rising, then steady
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 70 475/27/14/3308G14/093/ FEW SC OFFSHR DSNT ENE-S/
8/500 51013
1 P.M.
Weather: Clear, few stratocumulus offshore distant ENE-SE
Temperature: 31F; Dew Point: 12F; Relative Humidity: 44%
Wind: W @ 6 kts, wind light
Sea-level pressure: 1045.6 mb; 30.88 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 31F
6-hr Min temp: 18F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 70 456/31/12/2806/088/ FEW SC OFFSHR DSNT ENE-SE WND LGT/
8/500 58019 10032 20018
————————————————————–
SUMMARY FOR FRIDAY, DECEMBER 13, 2024
TEMPERATURE (DEGREES F)
MAX…….31 NORMAL…..41
MIN…….19 NORMAL…..26
MEAN……25 NORMAL…..33
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-8
TOTAL DEPARTURE FOR THE MONTH……………………-17 [-1.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………40 DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE MONTH…………..406 DEPARTURE…….+16
TOTAL HEATING UNITS FOR THE SEASON…………1349 DEPARTURE……-245
TOTAL HEATING UNITS LAST SEASON TO DATE…….1424 DEPARTURE…….-75
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)………..30 WNW @ 12:08 P.M.
VECTOR #1 (1-Sec)……….30 W @ 12:02 P.M.
VECTOR #2 (1-Sec)……….31 WNW @ 12:52 P.M.
DAVIS #1……………….31 W @ 12:09 P.M.
DAVIS #2 ………………29 NW @ 12:53 P.M.
RMY #1 (Instantaneous)…..30 WNW @ 12:59 P.M.
RMY #2 (Instantaneous)…..31 NW @ 12:48 P.M.
MERLIN…………………29 W
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 WNW @ 12:05 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 12:03 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 12:10 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 W @ 12:10 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 WNW @ 12:10 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 NW @ 12:48 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 WNW @ 12:10 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.7 WNW [257 total miles]
VECTOR #1………………11.1
VECTOR #2………………12.0
DAVIS #1……………….11.7 WNW
DAVIS #2……………….11.8 NW
RMY #1…………………10.7 WNW
RMY #2…………………11.7 WNW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..4.54 DEPARTURE…..+2.21
TOTAL PRECIPITATION FOR THE YEAR (2024)…….52.01 DEPARTURE…..+1.21
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH………………..3.0 DEPARTURE……-1.1
TOTAL SNOWFALL FOR THE SEASON (2024-2025)…….3.0 DEPARTURE……-3.6
————————————————————–
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/…/.. 51 WNW VEC1 49 WNW RMY 51
12/13 31/19/25/-8/0.00/0.0/…/.. 30 WNW VEC1 30 W RMY 30
12/14 The low since midnight is 17F, the daily normal low is 25F.
————————————————————–
DECEMBER DAILY RECORDS TO DATE
12/11 NEW PRECIPITATION RECORD OF 3.38″; OLD RECORD 2.36″ IN 1992
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941
RECORDS FOR DECEMBER 15
HIGH 64 IN 1975
LOW 4 IN 1900, 1905, 1933
PRECIP 1.80 INS. IN 1981
SNOW 7.5 INS. IN 1951
PEAK GUST 65 MPH NW IN 1991
TODAY’S REPORT PREPARED BY: Joshua Polen
