Monday, December 13, 2021

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

MONDAY, DECEMBER 13, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0705E
SUNSET:  1612E

CLOUDS THIS MORNING GIVE WAY TO SUNSHINE THIS AFTERNOON; TURNING MILD….

Plenty of cloud cover was the rule this morning, but the clouds
are clearing out early this afternoon leaving us with a very nice
afternoon.

Temperatures are responding nicely to the increasing sunshine with
readings shooting into the upper 40s early this afternoon, likely
heading for the low 50s.

Visibility has been somewhat limited today, starting the day at
about 40 miles, but increasing to 60 miles by mid morning.

The high so far today is 49F, which is 8 degrees above the normal
max of 41F. The low since midnight is 35F, which 9 degrees above
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: Broken altocumulus, broken cirrostratus, virga all quadrants
Temperature: 39F; Dew Point: 19F; Relative Humidity: 45%
Wind: WSW @ 16G25 kts, peak wind WSW 32 mph at 6:44 A.M.
Sea-level pressure: 1020.7 mb; 30.14 in. Hg: steady, then rising
Visibility: 40 miles
6-hr Max temp: 39F
6-hr Min temp: 35F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E150 BKN 200 BKN 40 207/39/19/2516G25/014/ VIRGA ALQDS
PK WND 2528/44/ 8/076 53005 10039 20035

10 A.M.
Weather: Overcast altocumulus, few breaks in overcast distant WNW-NW
Temperature: 40F; Dew Point: 20F; Relative Humidity: 45%
Wind: WSW @ 12G21 kts
Sea-level pressure: 1021.3 mb; 30.16 in Hg; rising, then more slowly
Visibility: 60 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E150 OVC 60 213/40/20/2512G21/016/ FEW BINOVC DSNT WNW-NW
HIER CLDS VSBL DSNT WNW-NW VIRGA ALQDS/ 8/07/ 51006

1 P.M.
Weather: Scattered altocumulus, scattered cirrocumulus/cirrostratus
Temperature: 47F, Dew point: 22F; Relative Humidity: 37%
Wind: SW @ 13G25 kts
Sea-level pressure: 1019.6mb; 30.11 in Hg; falling, then more slowly
Visibility: 60 miles
6-hr Max temp: 48F
6-hr Min temp: 39F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1755 SCT 130 SCT 200 60 196/47/22/2313G25/011/ 8/079 56017
10048 20039

SUMMARY FOR SUNDAY, DECEMBER 12, 2021

TEMPERATURE (DEGREES F)
MAX…….58     NORMAL…..41
MIN…….36     NORMAL…..26
MEAN……47     NORMAL…..34

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+13
TOTAL DEPARTURE FOR THE MONTH………………………+40 [+3.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………18  DEPARTURE…….-13
TOTAL HEATING UNITS FOR THE MONTH…………..317  DEPARTURE…….-41
TOTAL HEATING UNITS FOR THE SEASON…………1324  DEPARTURE……-238
TOTAL HEATING UNITS LAST SEASON TO DATE…….1307  DEPARTURE…… +17

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….55 WNW @  1:48 A.M.
AEROVANE……………….55 WNW @  1:50 A.M.
VECTOR #2 (Instantaneous)..60     @  1:48 A.M.
DAVIS #2 ………………52 WNW @  1:49 A.M.
RMY #2 (Instantaneous)…..58 WNW @  1:50 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 WNW @  1:51 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..42     @  1:51 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………42 WNW @  1:50 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..41 WNW @  1:51 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……18.5 WNW  [444 total miles] VECTOR #2…………….18.9
DAVIS #2……………..19.1 WNW
RMY #2……………….18.7 WNW
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………….0.83  DEPARTURE…..-1.32
TOTAL PRECIPITATION FOR THE YEAR………….57.60  DEPARTURE…..+7.24

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……-2.5
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.2  DEPARTURE……-4.0

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/+1/0.00/0.0/…/..       21 SE  AERO 20 SE  RMY 21
12/11   62/37/50/+16/0.34/0.0/…/..      57 SSW AERO 59 SSW RMY 58
12/12   58/36/47/+13/0.05/0.0/…/..      55 WNW AERO 55 WNW RMY 58

12/13   The low since midnight is 35F, 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 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

RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941

TODAY’S REPORT PREPARED BY: Matt Douglas