Sunday, December 5, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, DECEMBER 5, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0658E
SUNSET: 1612E
MILDER TODAY WITH INCREASING VISIBILITY AND A LIGHT WESTERLY WIND….
We observed a visibility increase of 15 miles over the course of
the day, from 60 miles this morning to 75 miles at the 1 P.M.
observation. The only notable cloud cover is a very thin layer of
cirrostratus, allowing for abundant sunshine.
Wind is westerly at a little under 10 mph on average, with a max of
20 mph.
The high so far today is 45F, which is 2 degrees above the normal
max of 43F. The low since midnight is 32F, 4 degrees above the
normal low of 28F.
————————————————————–
PRELIMINARY STATS FOR NOVEMBER 2021
TEMPERATURE, Deg. F
Avg. Max. 50.8 [+0.7]
Avg. Min. 33.6 [-0.2]
Mean 42.2 [+0.2]
24-hour corrected mean: 41.6
Max. for month: 69F on the 18th
Min. for month: 21F on the 30th
HEATING DEGREE DAYS
Total heating units: 680 [-12]
Total for the season: 1007 [-197]
Total for last season: 1204
PRECIPITATION, Inches
Total: 1.92 [-2.39]
Greatest in 24 hrs: 1.00 inch on the 12th
SNOWFALL, Inches
Total: 1.0 ins. [-0.8]
Greatest in 24 hrs: 1.0 ins. from the 26th-27th
WIND, mph
Avg. uncorrected wind speed: 11.2 mph
Avg. corrected wind speed: 11.7 mph
Prevailing wind direction: WNW [16%]
Peak gust and direction: 72 SSE on the 12th
SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A
————————————————————–
Today’s Observations:
7 A.M.
Weather: Broken thin cirrostratus, few altocumulus offshore
Temperature: 33F; Dew Point: 24F; Relative Humidity: 69%
Wind: W @ 8 kts
Sea-level pressure: 1026.9 mb; 30.32 in. Hg: rising, then more
slowly
Visibility: 60 miles
6-hr Max temp: 34F
6-hr Min temp: 32F
24-hr Precip: 0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 250 -BKN 60 269/33/24/2708/032/ FEW AC DSNT OFFSHR/ 8/086
51026 10034 20032
10 A.M.
Weather: Thin overcast cirrostratus
Temperature: 40F; Dew Point: 24F; Relative Humidity: 52%
Wind: W @ 7 kts
Sea-level pressure: 1029.4 mb; 30.39 in Hg; rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 250 -OVC 70 294/40/24/2707/039/ 8/006 51025
1 P.M.
Weather: Thin broken cirrostratus, few altocumulus
Temperature: 43F, Dew point: 22F; Relative Humidity: 42%
Wind: WNW @ 7 kts
Sea-level pressure: 1028.3 mb; 30.36 in Hg; falling, then more rapidly
Visibility: 75 miles
6-hr Max temp: 45F
6-hr Min temp: 33F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 250 -BKN 75 283/43/22/3007/036/ FEW AC ALQDS/ 8/086 58011
10045 20033
SUMMARY FOR SATURDAY, DECEMBER 4, 2021
TEMPERATURE (DEGREES F)
MAX…….39 NORMAL…..44
MIN…….25 NORMAL…..28
MEAN……32 NORMAL…..36
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………… -4
TOTAL DEPARTURE FOR THE MONTH……………………… +5 [+1.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………33 DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH…………..109 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON…………1116 DEPARTURE……-202
TOTAL HEATING UNITS LAST SEASON TO DATE…….1056 DEPARTURE…… +60
PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….25 SW @ 8:40 P.M.
AEROVANE……………….23 SW @ 8:41 P.M.
VECTOR #2 (Instantaneous)..26 @ 8:40 P.M.
DAVIS #2 ………………25 SW @ 8:14 P.M.
RMY #2 (Instantaneous)…..26 SW @ 8:40 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 SSW @ 8:40 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 8:41 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 SW @ 8:45 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 SW @ 8:41 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE…..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….10.1 WSW [243 total miles]
VECTOR #2……………..10.9
DAVIS #2………………10.9 WSW
RMY #2………………..10.9 WSW
RMY #1…………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH………….0.00 DEPARTURE…..-0.70
TOTAL PRECIPITATION FOR THE YEAR………….56.77 DEPARTURE…..+7.86
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH……………….0.0 DEPARTURE……-0.9
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……1.0 DEPARTURE……-2.4
PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
11/01 59/41/50/+3/0.00/0.0/594/96 38 WNW AERO 39 WNW RMY 39
11/02 56/40/48/+1/0.00/0.0/247/40 25 SW AERO 25 SW RMY 26
11/03 51/35/43/-3/0.00/0.0/572/93 28 W AERO 25 W RMY 27
11/04 49/31/40/-6/0.00/0.0/446/73 17 NNE AERO 17 NNW RMY 16
11/05 49/32/41/-5/0.00/0.0/591/97 25 NW AERO 24 NW RMY 24
11/06 51/34/43/-2/0.00/0.0/595/98 18 SSW AERO 17 SW RMY 19
11/07 55/37/46/+1/0.00/0.0/514/85 17 W AERO 17 W RMY 16
11/08 60/38/49/+4/0.00/0.0/578/96 20 N AERO 18 N RMY 19
11/09 69/45/57/+13/0.00/0.0/582/97 21 W AERO 21 W RMY 22
11/10 60/44/52/+8/0.00/0.0/389/65 36 NW AERO 35 NW RMY 35
11/11 56/40/48/+5/0.00/0.0/501/84 26 SE AERO 28 SE RMY 27
11/12 61/45/53/+10/1.00/0.0/000/00 72 SSE AERO 78 SSE RMY 76
11/13 60/36/48/+5/0.32/0.0/556/94 53 SW AERO 53 SW RMY 54
11/14 47/33/40/-2/0.03/0.0/336/57 29 W AERO 28 W RMY 28
11/15 48/36/42/0/0.07/0.0/405/69 35 W AERO 36 W RMY 38
11/16 46/31/39/-3/0.00/0.0/…/.. 40 WNW AERO 41 WNW RMY 42
11/17 49/30/40/-1/0.00/0.0/…/.. 34 S AERO 36 S RMY 34
11/18 69/49/59/+18/T/0.0/…/.. 39 NW AERO 36 WNW RMY 42
11/19 51/32/42/+1/0.29/0.0/…/.. 42 W AERO 41 W RMY 41
11/20 45/27/36/-4/0.00/0.0/…/.. 23 S AERO 23 S RMY 24
11/21 52/36/44/+4/T/0.0/…/.. 35 S AERO 35 S RMY 36
11/22 55/33/44/+4/0.09/0.0/…/.. 41 WSW AERO 41 WSW RMY 42
11/23 38/24/31/-8/0.00/0.0/…/.. 36 NW AERO 37 NW RMY 37
11/24 41/22/32/-7/0.00/0.0/…/.. 33 NW AERO 32 NW RMY 34
11/25 53/31/42/+3/0.00/0.0/…/.. 21 WNW AERO 21 W RMY 21
11/26 43/31/37/-1/0.11/0.9/…/.. 39 WNW AERO 39 WNW RMY 41
11/27 37/24/31/-7/0.01/0.1/…/.. 47 WNW AERO 45 WNW RMY 48
11/28 36/24/30/-8/T/T/…/.. 22 W AERO 21 W RMY 23
11/29 39/25/32/-6/0.00/0.0/…/.. 30 NW AERO 28 NW RMY 30
11/30 40/21/31/-6/0.00/0.0/…/.. 27 WNW AERO 23 WSW RMY 26
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
12/01 44/30/37/0.00/0.0/…/.. 35 W AERO 35 W RMY 34
12/02 58/35/47/10/T/0.0/…/.. 56 WNW AERO 59 WNW RMY 62
12/03 41/28/35/-1/0.00/0.0/…/.. 46 NW AERO 44 NW RMY 46
12/04 39/25/32/-4/0.00/0.0/…/.. 25 SW AERO 23 SW RMY 26
12/05 The low since midnight is 32F, the daily normal low is 28F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 5
HIGH 65 IN 2001
LOW -1 IN 1926
PRECIP 2.86 INS. IN 1993
SNOWFALL 7.0 INS. IN 1893, 1895, 1926, 1981
PEAK GUST 67 MPH WNW IN 1961, S IN 1973
RECORDS FOR DECEMBER 6
HIGH 70 IN 2001
LOW 5 IN 1901,1935
PRECIP 2.78 INS. IN 2003
SNOWFALL 17.0 INS. IN 2003
PEAK GUST 74 MPH NW IN 1981
TODAY’S REPORT PREPARED BY: Benjamin Turner
