Thursday, December 9, 2021

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

THURSDAY, DECEMBER 9, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0702E
SUNSET:  1610E

PARTLY CLOUDY WITH GOOD VISIBILITY FOLLOWING SOME
OVERNIGH SNOWFALL….

Overnight snow left 1.2 inches, with a 0.10 inch being measured
for the liquid amount. Skies were partly cloudy at most, and
visibility reached 70 miles by the 1 P.M. observation.

Wind intensified as the day went on, with an average speed of
10 mph and a max gust of 25 mph around noontime.

The high so far today is 35F, which is 7 degrees below the normal
max of 42F. The low since midnight is 20F, 7 degrees below the
normal low of 27F.

————————————————————–

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: 11466 minutes of a possible 17010 or 67%
Astronomical total minutes: 11874 minutes of a possible 17610 or 67%

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus offshore, few cirrostratus
Temperature: 21F; Dew Point: 17F; Relative Humidity: 54%
Wind: W @ 6 kts, light
Sea-level pressure: 1018.0 mb; 30.06 in. Hg: rising, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 24F
6-hr Min temp: 20F
24-hr Precip:  0.10 ins.
24-hr Snowfall: 1.2 ins.
Snow Depth: 1 ins.
BHO SA 1155 CLR 30 180/21/17/2706/006/ FEW CU OFFSHR FEW CS ALQDS NEW
SNW PST 24 HRS 1.2 INS. HAZY WND LGT/ 8/105 4/001 51022 70010 10024
20020

10 A.M.
Weather: Clear, few cumulus offshore, few cirrostratus
Temperature: 30F; Dew Point: 24F; Relative Humidity: 78%
Wind: NW @ 9 kts,
Sea-level pressure: 1020.6 mb; 30.14 in Hg; rising, then more
rapidly
Visibility: 40 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 40 206/30/24/3109/014/ FEW CU OFFSHR FEW CS ALQDS/
8/105 53026

1 P.M.
Weather: Scattered cumulus and cirrostratus
Temperature: 34F, Dew point: 19F; Relative Humidity: 54%
Wind: NNW @ 10G20 kts
Sea-level pressure: 1020.9 mb; 30.15 in Hg; steady, then rising
Visibility: 70 miles
6-hr Max temp: 35F
6-hr Min temp: 21F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 40 SCT 250 SCT 70 209/34/19/3410G20/015/ 8/106 53003
10035 20021

SUMMARY FOR WEDNESDAY, DECEMBER 8, 2021

TEMPERATURE (DEGREES F)
MAX…….34     NORMAL…..42
MIN…….25     NORMAL…..27
MEAN……30     NORMAL…..35

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH………………………+16 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH…………..217  DEPARTURE…….-17
TOTAL HEATING UNITS FOR THE SEASON…………1224  DEPARTURE……-214
TOTAL HEATING UNITS LAST SEASON TO DATE…….1195  DEPARTURE…… +29

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….26 NNE @  6:21 P.M.
AEROVANE……………….25 NE  @  6:07 P.M.
VECTOR #2 (Instantaneous)..26     @  6:07 P.M.
DAVIS #2 ………………25 NE  @  6:07 P.M.
RMY #2 (Instantaneous)…..26 NE  @  6:07 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………………16 NNE @  6:24 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17     @  6:23 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 NNE @  6:23 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 NNE @  9:26 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…….8.3 NNE [198 total miles] VECTOR #2……………..8.9
DAVIS #2………………8.4 NNE
RMY #2………………..8.7 NNE
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…….0.10  DEPARTURE…..-0.08
TOTAL PRECIPITATION FOR THE MONTH………….0.44  DEPARTURE…..-0.99
TOTAL PRECIPITATION FOR THE YEAR………….57.21  DEPARTURE…..+7.57

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….1.2  DEPARTURE……+0.8
TOTAL SNOWFALL FOR THE MONTH……………….1.2  DEPARTURE……-1.0
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.2  DEPARTURE……-2.5

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 TSTM
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/-3/0.00/0.0/555/95      40 WNW AERO 41 WNW RMY 42
11/17   49/30/40/-1/0.00/0.0/291/50      34 S   AERO 36 S   RMY 34
11/18   69/49/59/+18/T/0.0/557/96        39 NW  AERO 36 WNW RMY 42
11/19   51/32/42/+1/0.29/0.0/463/80      42 W   AERO 41 W   RMY 41
11/20   45/27/36/-4/0.00/0.0/525/91      23 S   AERO 23 S   RMY 24
11/21   52/36/44/+4/T/0.0/063/11         35 S   AERO 35 S   RMY 36
11/22   55/33/44/+4/0.09/0.0/011/02      41 WSW AERO 41 WSW RMY 42
11/23   38/24/31/-8/0.00/0.0/497/87      36 NW  AERO 37 NW  RMY 37
11/24   41/22/32/-7/0.00/0.0/569/100     33 NW  AERO 32 NW  RMY 34
11/25   53/31/42/+3/0.00/0.0/358/63      21 WNW AERO 21 W   RMY 21
11/26   43/31/37/-1/0.11/0.9/000/00      39 WNW AERO 39 WNW RMY 41
11/27   37/24/31/-7/0.01/0.1/462/82      47 WNW AERO 45 WNW RMY 48
11/28   36/24/30/-8/T/T/090/16           22 W   AERO 21 W   RMY 23
11/29   39/25/32/-6/0.00/0.0/135/24      30 NW  AERO 28 NW  RMY 30
11/30   40/21/31/-6/0.00/0.0/392/70      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 TSTM
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   45/32/39/+3/0.00/0.0/…/..       25 SE  AERO 25 SE  RMY 25
12/06   59/37/48/+13/0.34/0.0/…/..      59 WNW AERO 59 NW  RMY 60
12/07   40/29/35/0/T/0.0/…/…          47 WNW AERO 36 WNW RMY 48
12/08   34/25/30/-5/…./…/…/..       26 NNE AERO 25 NE  RMY 26

12/09   The low since midnight is 20F, the daily normal low is 27F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 3.23 INS. IN 2014
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INS. IN 1907
SNOWFALL 6.0 INS. IN 1905
PEAK GUST 66e SW IN 1940

TODAY’S REPORT PREPARED BY: Benjamin Turner