Saturday, December 11, 2021

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

SATURDAY, DECEMBER 11, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0704E
SUNSET:  1611E

RAINY AND WINDY WITH VERY LIMITED VISIBILITY….

Today we measured 0.29 inches so far, as wind seems to be the main
feature. We are experiencing wind around 25 mph on average with a
max gust so far of 42 mph!

Visibility is almost nonexistent with only a 1/16th mile all day.
The most intense rainfall occurred between 11 A.M. and noontime.

The high so far today is 57F, which is 16 degrees above the normal
max of 41F. The low since midnight is 37F, which 11 degrees higher
than the normal low of 26F.

————————————————————–

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: Light drizzle
Temperature: 42F; Dew Point: 42F; Relative Humidity: 67%
Wind: SSE @ 13 kts
Sea-level pressure: 1015.2 mb; 30.23 in. Hg: falling, then falling
more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 42F
6-hr Min temp: 37F
24-hr Precip:  0.01 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W3 1/16L-F 152/42/42/1113/998/ 8//// 58033 70001
10042 20037

10 A.M.
Weather: Drizzle
Temperature: 43F; Dew Point: 43F; Relative Humidity: 100%
Wind: S @ 22 kts
Sea-level pressure: 1000.7 mb; 29.85 in Hg; falling, then more
rapidly
Visibility: 1/16 mile, fog
3-hr Precip: 0.07 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W3 1/16LF 107/43/43/1822/985/ 8//// 58045 6007/

1 P.M.
Weather: Rain becoming drizzle around 12:45 P.M.
Temperature: 57F, Dew point: 57F; Relative Humidity: 100%
Wind: SSW @ 15G21 kts, peak of 47 mph SSW at 11:54 A.M.
Sea-level pressure: 1005.7mb; 29.69 in Hg; falling, then more
slowly
Visibility: 1/16 mile, fog
6-hr Max temp: 57F
6-hr Min temp: 40F
6-hr Precip: 0.28 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1755 X W3 1/16LR 057/57/57/2015G21/969/ R BCMG L45 PK WND
2041/1654/ 8//// 56050 6028/ 10057 20040

SUMMARY FOR FRIDAY, DECEMBER 10, 2021

TEMPERATURE (DEGREES F)
MAX…….43     NORMAL…..42
MIN…….27     NORMAL…..27
MEAN……35     NORMAL…..34

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+1
TOTAL DEPARTURE FOR THE MONTH………………………+11 [+0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………..284  DEPARTURE…….-11
TOTAL HEATING UNITS FOR THE SEASON…………1291  DEPARTURE……-208
TOTAL HEATING UNITS LAST SEASON TO DATE…….1269  DEPARTURE…… +29

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….21 SE  @  8:30 A.M.
AEROVANE……………….20 SE  @  8:31 A.M.
VECTOR #2 (Instantaneous)..22     @  8:30 A.M.
DAVIS #2 ………………21 SSE @  8:47 A.M.
RMY #2 (Instantaneous)…..22 SE  @  8:30 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………………17 SE  @  8:27 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17     @  8:27 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 SE  @  8:29 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 SE  @  8:28 A.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…….6.6 SE  [158 total miles] VECTOR #2……………..7.3
DAVIS #2………………7.0 SE
RMY #2………………..7.4 SE
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…….0.01  DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH………….0.45  DEPARTURE…..-1.34
TOTAL PRECIPITATION FOR THE YEAR………….57.22  DEPARTURE…..+7.22

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0  DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH……………….1.2  DEPARTURE……-1.7
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.2  DEPARTURE……-3.2

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   The low since midnight is 37F, 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 11
HIGH 63 IN 1911
LOW -1 IN 1988
PRECIP 2.36 INS. IN 1992
SNOWFALL 4.8 INS. IN 2019
PEAK GUST 78 S IN 1969

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

TODAY’S REPORT PREPARED BY: Benjamin Turner