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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

FRIDAY, DECEMBER 1, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0653E
SUNSET: 1613E

WARMER TEMPERATURES MOVE IN WITH INCREASING CLOUDS IN THE AFTERNOON…

Happy first day of meteorological winter! Our first day of December
started off with mostly clear skies and above average temperatures. By
late morning an increase of clouds moved through the area, but so far
we have stayed dry.

Temperatures have been in the 40’s for much of the day and nearing
around 50F by the last daily observation. Dew points have been a bit
higher than yesterday, hovering around the upper 30’s.

The wind started out rather breezy this morning and as the day
progressed it slowly declined.The average speed has been around 14 mph.
The peak gust so far is around 27mph which occurred before 4 am.

Hazy conditions continue into today which has impacted our visibility.
The visibility has been in the 30-40 mile range.

The maximum temperature so far today is 50F degrees, which is 5 degrees
above the normal high of 45F. The minimum temperature since midnight
is 38F, which is 9 degrees above the normal low of 29F.

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PRELIMINARY STATS FOR NOVEMBER 2023

TEMPERATURE, Deg. F
Avg. Max. 48.5 [-1.6] Avg. Min. 31.8 [-2.0] Mean 40.2 [-1.8] 24-hour corrected mean: 39.7
Max. for month: 65F on the 7th
Min. for month: 20F on the 25th

HEATING DEGREE DAYS
Total heating units: 737 [+045] Total for the season: 1087 [-117] Total for last season: 969

COOLING DEGREE DAYS
Total cooling units: 000 [ 000] Total for the season: 715 [+038] Total for last season: 889

PRECIPITATION, Inches
Total: 2.18 [-2.13] Greatest in 24 hrs: 1.25 on the 21st-22nd

SNOWFALL, Inches
Total: Trace [-1.8] Greatest in 24 hrs: T on the 1st, 9th, 13th, 21st, and 22nd

WIND, mph
Avg. uncorrected wind speed: 10.8 mph
Avg. corrected wind speed: 11.3 mph
Prevailing wind direction: Northwest [15%] Peak gust and direction: 46 SE on the 27th

SUNSHINE:
Campbell-Stokes card minutes: 10470 of a possible 17010, or 62%
Astronomical total minutes: 10860 of a possible 17641, or 62%

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant NNE-E few cirrus SE-E, thin
smoke layer all quadrants
Temperature: 40F; Dew Point: 36F; Relative Humidity: 85%
Wind: SW @ 13 kts
Sea-level pressure: 1020.9 mb; 30.15 in. Hg: rising, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 42F
6-hr Min temp: 38F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 30 209/40/36/2213/015/ THN K LYR ALQDS FEW AC DSNT NNE-E
FEW CI SE-E HAZY/ 8/051 51006 10042 20038

10 A.M.
Weather: Thin scattered cirrus/cirrostratus
Temperature: 48F; Dew Point: 37F; Relative Humidity: 65%
Wind: SSW @ 8 kts
Sea-level pressure: 1021.3 mb; 30.16 in. Hg: rising steady
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 250 -SCT 40 213/48/37/2108/016/ HAZY/ 8/006 52004

1 P.M.
Weather: Broken altocumulus, overcast cirrostratus
Temperature: 50F; Dew Point: 37F; Relative Humidity: 60%
Wind: SSW @ 7 kts
Sea-level pressure: 1019.7 mb; 30.11 in. Hg: falling, then more slowly
Visibility: 40 miles, sun dimly visible
6-hr Max temp: 50F
6-hr Min temp: 40F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E120 BKN 200 OVC 40 197/50/37/2107/011/ SUN DMLY VSBL/
8/087 56002 10050 20040

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SUMMARY FOR THURSDAY, NOVEMBER 30, 2023

TEMPERATURE (DEGREES F)
MAX…….45 NORMAL…..45
MIN…….27 NORMAL…..29
MEAN……36 NORMAL…..37

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-1
TOTAL DEPARTURE FOR THE MONTH…………………-46 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………29 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………..737 DEPARTURE…….+45
TOTAL HEATING UNITS FOR THE SEASON…………1087 DEPARTURE……-117
TOTAL HEATING UNITS LAST SEASON TO DATE……..969 DEPARTURE……+118

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)……….E32 SW @ 11:34 P.M.
VECTOR #1 (1-Sec)……….32 SW @ 11:31 P.M.
VECTOR #2 (1-Sec)……….30 SW @ 08:31 P.M.
DAVIS #1……………….29 SW @ 08:31 P.M.
DAVIS #2 ………………29 SW @ 11:24 P.M.
RMY #1 (Instantaneous)…..31 SW @ 11:31 P.M.
RMY #2 (Instantaneous)…..31 SW @ 08:31 P.M.
MERLIN…………………30 SW
RICHARDS (C5C) (Inst)……34 @ 11:31 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 SW @ 11:35 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 11:35 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 11:35 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 SSW @ 11:25 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 SW @ 11:35 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SSW @ 11:13 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 SW @ 11:24 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 @ 11:06 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.5 SW [299 total miles] VECTOR #1…………….12.7
VECTOR #2…………….13.0
DAVIS #1……………..12.2 SW
DAVIS #2……………..13.0 SW
RMY #1……………….12.6 SW
RMY #2……………….13.1 SW
RICHARDS (C5C)………..12.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..2.18 DEPARTURE…..-2.13
TOTAL PRECIPITATION FOR THE YEAR…………..51.37 DEPARTURE…..+2.90

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE……-1.8
TOTAL SNOWFALL FOR THE SEASON (2023-2024)…..TRACE DEPARTURE……-2.5

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PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/1 42/31/37/-10/0.01/T/056/09 23 ENE VEC1 21 ENE RMY 23
11/2 45/28/37/-10/0.00/0.0/618/100 23 NNW VEC1 23 NNW RMY 22
11/3 55/36/46/0/0.00/0.0/541/88 32 SW VEC1 33 SSW RMY 33
11/4 59/44/52/+6/0.00/0.0/049/08 32 SW VEC1 31 SW RMY 32
11/5 61/42/52/+6/0.00/0.0/360/59 24 NNW VEC1 27 NNW RMY 27
11/6 50/40/45/+/0.00/0.0/067/11 28 S VEC1 27 S RMY 25
11/7 65/46/56/+11/0.05/0.0/272/45 38 WNW VEC1 37 WNW RMY 37
11/8 48/33/41/-4/0.00/0.0/440/73 36 NNW VEC1 38 NNW RMY 39
11/9 42/32/37/+7/0.11/T/000/00 20 WNW VEC1 20 WNW RMY 20
11/10 49/38/44/0/0.00/0.0/024/04 23 W VEC1 23 W RMY 22
11/11 49/30/40/-3/0.00/0.0/590/99 29 NW VEC1 26 NW RMY 30
11/12 41/27/34/-9/0.00/0.0/475/80 20 N VEC1 19 N RMY 19
11/13 44/24/34/-9/T/T/456/77 20 NNW VEC1 20 N RMY 19
11/14 47/31/39/-3/0.00/0.0/342/58 29 NW VEC1 29 NW RMY 29
11/15 50/30/40/-2/0.00/0.0/475/81 30 SW VEC1 30 SW RMY 31
11/16 62/40/51/+9/0.00/0.0/574/98 30 WSW VEC1 31 WSW RMY 31
11/17 64/43/54/+13/0.00/0.0/280/48 35 SSW VEC1 36 SSW RMY 37
11/18 56/30/43/+2/0.20/0.0/157/27 35 NW VEC1 35 NW RMY 37
11/19 50/29/40/-1/0.00/0.0/475/82 38 WNW VEC1 38 WNW RMY 39
11/20 38/25/32/-8/0.00/0.0/577/100 29 NNW VEC1 32 NNW RMY 33
11/21 39/22/31/-9/0.05/T/363/63 29 SE VEC1 29 SE RMY 28
11/22 53/33/43/+3/1.20/T/000/00 38 SE VEC1 40 SE RMY 37
11/23 50/36/43/+4/0.00/0.0/572/100 33 NW VEC1 32 NW RMY 33
11/24 47/26/37/-2/0.00/0.0/496/87 35 WNW VEC1 33 WNW RMY 33
11/25 35/20/28/-11/0.00/0.0/545/96 26 NW VEC1 25 NW RMY 26
11/26 43/27/35/-3/0.08/0.0/289/51 31 SE VEC1 36 SE RMY 32
11/27 53/34/44/+6/0.48/0.0/401/71 46 SE VEC1 48 SE RMY 47
11/28 38/26/32/-6/0.00/0.0/355/63 41 WNW VEC1 42 WNW RMY 43
11/29 36/23/30/-8/0.00/0.0/472/84 31 WNW VEC1 31 WNW RMY 30
11/30 45/27/36/-1/0.00/0.0/…/.. 32 SW VEC1 32 SW RMY 31