Sunday, December 12, 2021

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

SUNDAY, DECEMBER 12, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0705E
SUNSET:  1610E

THE COMPLETE OPPOSITE OF YESTERDAY, AN IMMACULATE DAY ATOP
GREAT BLUE HILL….

Yesterday’s rain totaled 0.39 inches, bringing our monthly rain
total to 0.83 inches. The monthly deficit is still 1.14 inches.
The annual surplus for liquid precipitation is 7.42 inches.

Today consisted of perfect visibility and almost clear skies by
noontime. Ninety miles were seen at both the 10 A.M. and the
1 P.M. observations.

We are still busy in the wind department, with an average speed of
20 mph and frequent gusts around 30 mph. The highest gust so far
today is almost 50 mph!

The high so far today is 58F, which is 17 degrees below the normal
max of 41F. The low since midnight is 38F, which 13 degrees higher
than the normal low of 26F.

The current temperature is 44F, the 58F was seen very early this
morning.

————————————————————–

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: Scattered stratocumulus, broken altocumulus,
overcast cirrostratus with breaks NW-N
Temperature: 38F; Dew Point: 23F; Relative Humidity: 54%
Wind: WNW @ 23G38 kts
Sea-level pressure: 1015.2 mb; 30.23 in. Hg: rising, then more
slowly
Visibility: 75 miles
6-hr Max temp: 38F
6-hr Min temp: 23F
24-hr Precip:  0.38 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 60 SCT 150 BKN 230 OVC 75 094/38/23/2923G38/981/
BINOVC WNW-N PK WND 2940/1052/ 8/878 51042 70038 10051 20038

10 A.M.
Weather: Scattered altocumulus and cirrus, few distant
cumulus SW-S-NW
Temperature: 68F; Dew Point: 21F; Relative Humidity: 50%
Wind: WNW @ 12G21 kts, peak of 31 mph WNW at 9:13 A.M.
Sea-level pressure: 1013.8 mb; 29.94 in Hg; rising, then more
slowly
Visibility: 90 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 SCT 150 SCT 250 90 138/68/21/3012G21/994/ FEW CU DSNT
SW-S-NW PK WND 3027/13/ 8/151 51044

1 P.M.
Weather: Clear, few distant cumulus
Temperature: 43F, Dew point: 15F; Relative Humidity: 31%
Wind: WNW @ 17G23 kts, peak of 37 mph WNW at 11:52 A.M.
Sea-level pressure: 1014.2mb; 29.95 in Hg; falling then rising
Visibility: 90 miles
6-hr Max temp: 44F
6-hr Min temp: 38F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1755 CLR 90 142/43/15/3017G23/995/ FEW CU DSNT ALQDS PK
WND 3032/1652/ 8/100 53004 10044 20038

SUMMARY FOR SATURDAY, DECEMBER 11, 2021

TEMPERATURE (DEGREES F)
MAX…….62     NORMAL…..41
MIN…….37     NORMAL…..26
MEAN……50     NORMAL…..34

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+16
TOTAL DEPARTURE FOR THE MONTH………………………+27 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE…….-16
TOTAL HEATING UNITS FOR THE MONTH…………..299  DEPARTURE…….-28
TOTAL HEATING UNITS FOR THE SEASON…………1306  DEPARTURE……-224
TOTAL HEATING UNITS LAST SEASON TO DATE…….1286  DEPARTURE…… +20

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….57 SSW @ 11:29 A.M.
AEROVANE……………….59 SSW @ 11:19 A.M.
VECTOR #2 (Instantaneous)..67     @ 11:19 A.M.
DAVIS #2 ………………56 SW  @ 11:29 A.M.
RMY #2 (Instantaneous)…..67 SSW @ 11:30 A.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………………43 SSW @ 11:31 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..41     @ 11:30 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………41 SW  @ 11:31 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..41 SSW @ 11:30 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……20.2 SSW  [485 total miles] VECTOR #2…………….20.3
DAVIS #2……………..20.1 SSW
RMY #2……………….20.5 S
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…….0.38  DEPARTURE…..+0.20
TOTAL PRECIPITATION FOR THE MONTH………….0.83  DEPARTURE…..-1.14
TOTAL PRECIPITATION FOR THE YEAR………….57.60  DEPARTURE…..+7.42

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0  DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH……………….1.2  DEPARTURE……-2.1
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.2  DEPARTURE……-3.6

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/-5/0.05/0.6/…/..       26 NNE AERO 25 NE  RMY 26
12/09   35/20/28/-6/0.05/0.6/…/..       32 NW  AERO 30 NW  RMY 33
12/10   43/27/35/+1/…./…/…/..       21 SE  AERO 20 SE  RMY 21
12/11   62/37/50/+16/…./…/…/..      57 SSW AERO 59 SSW RMY 58

12/12   The low since midnight is 38F, the daily normal low is 26F

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: Benjamin Turner