Friday, December 11, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, DECEMBER 11, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
A WARMER THAN NORMAL DAY ATOP GREAT BLUE HILL….
Today we observed mostly cloudy skies, with a max
visibility of 40 miles due to haze. Wind is
southwesterly, with a max gust of 29 mph and an
average speed of 15 mph. Pressure is on a steady
decline, which may be the reason for the increase
in clouds this afternoon.
Temperatures are definitely warmer in comparison
to the preceding days. The high so far today is
48F, 7 degrees above the daily normal high of 41F.
The low since midnight is 31F, 6 degrees above
the normal low of 25F.
PRELIMINARY STATS FOR NOVEMBER 2020
TEMPERATURE, Deg. F
Avg. Max. 56.3 [+6.3]
Avg. Min. 38.6 [+5.1]
Mean 47.5 [+5.8]
24-hour corrected mean: 46.9
Max. for month: 75F on the 7th
Min. for month: 18F on the 19th
HEATING DEGREE DAYS
Total heating units: 521 [-177]
Total for the season: 973 [-288]
Total for last season: 1237
PRECIPITATION, Inches
Total: 5.23 [+1.77]
Greatest in 24 hrs: N/A
SNOWFALL, Inches
Total: TRACE
Greatest in 24 hrs: T on the 2nd
WIND, mph
Avg. uncorrected wind speed: 12.9 mph
Avg. corrected wind speed: 13.2 mph
Prevailing wind direction: SSW [14%]
Peak gust and direction: 81 SSE on the 30th
SUNSHINE:
Campbell-Stokes card minutes: 9066 minutes of a possible 17010 or 53%
Astronomical total minutes: 9382 minutes of a possible 17593 or 53%
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 32F; Dew Point: 28F; Relative Humidity: 85%
Wind: SW at 8 kts
Sea-level pressure: 30.23 in Hg; rising steadily
Visibility: 40 miles, hazy
6-hr Max temp: 34F
6-hr Min temp: 31F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 1 ins.
BHO SA 1155 140 SCT 250 BKN 40 238/32/28/2308/023/ HAZY/
8/056 4/001 53008 10034 20031
10 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 42F; Dew Point: 33F; Relative Humidity: 70%
Wind: SSW at 13 kts
Sea-level pressure: 30.22 in Hg; falling steadily
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 140 SCT 250 BKN 35 232/42/33/2013/022/ HAZY/
8/056 56005
1 P.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 48F; Dew Point: 35F; Relative Humidity: 60%
Wind: SSW at 15G22 kts
Sea-level pressure: 30.17 in Hg; falling steadily
Visibility: 30 miles, hazy
6-hr Max temp: 48F
6-hr Min temp: 32F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 160 SCT 250 BKN 30 200/48/35/2115G22/014/ HAZY/
8/056 56032 10048 20032
SUMMARY FOR THURSDAY, DECEMBER 10, 2020
TEMPERATURE (DEGREES F)
MAX…….42 NORMAL…..41
MIN…….30 NORMAL…..26
MEAN……36 NORMAL…..33
DEPARTURE FROM 30-YEAR NORMAL………………. +3
TOTAL DEPARTURE FOR THE MONTH………………. +12 [+1.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………29 DEPARTURE…….-3
TOTAL HEATING UNITS FOR THE MONTH…………..289 DEPARTURE……-12
TOTAL HEATING UNITS FOR THE SEASON…………1262 DEPARTURE…..-300
TOTAL HEATING UNITS LAST SEASON TO DATE…….1569 DEPARTURE…..-307
PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..30 WNW AT 9:16 A.M.
AEROVANE (south tower)…..31 WNW AT 9:14 A.M.
ASOS…………………..29 W AT 9:18 A.M.
DAVIS #1……………….31 W AT 9:17 A.M.
DAVIS #2 (south tower)…..30 WNW AT 11:12 A.M.
RMY……………………29
VECTOR…………………33
MERLIN…………………30
FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..18 WNW AT 11:12 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NW AT 1:36 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 WNW AT 12:38 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 WNW AT 11:12 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…..10.5 WNW [251 total miles]
ASOS………………..10.6 [254 total miles]
DAVIS #1…………….11.3 WNW [271 total miles]
DAVIS #2…………….11.6 WNW [278 total miles]
RMY…………………10.1 WNW [243 total miles]
VECTOR………………10.8 [252 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.17
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….2.81 DEPARTURE….+1.16
ASOS………….2.89
TOTAL PRECIPITATION FOR THE YEAR………….47.38 DEPARTURE….-0.97
ASOS………..48.33
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…..-0.4
TOTAL SNOWFALL FOR THE MONTH……………….2.8 DEPARTURE…..-0.4
TOTAL SNOWFALL FOR THE SEASON………………9.3 DEPARTURE…..+3.5
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 49/36/43/-3/0.69/0.0/006/01 38 W AERO 40 W RMY 39
11/02 40/31/36/-10/T/T/425/69 61 WNW AERO 62 WNW RMY 62
11/03 43/29/36/-10/0.00/0.0/473/77 48 WNW AERO 53 WNW RMY 48
11/04 54/30/42/-3/0.00/0.0/550/90 30 SSW AERO 30 SSW RMY 30
11/05 69/49/59/+14/0.00/0.0/548/90 37 SSW AERO 40 SSW RMY 38
11/06 72/55/64/+19/0.00/0.0/394/65 28 SW AERO 28 SW RMY M
11/07 75/54/65/+20/0.00/0.0/562/93 21 WSW AERO 21 WSW RMY 21
11/08 73/54/64/+20/0.00/0.0/584/97 18 W AERO 18 W RMY 19
11/09 74/52/63/+19/0.00/0.0/593/99 20 WSW AERO 18 WSW RMY 21
11/10 74/53/64/+20/0.00/0.0/597/100 30 SW AERO 28 SW RMY 31
11/11 73/58/66/+23/0.04/0.0/137/23 40 SW AERO 44 SW RMY 45
11/12 64/46/55/+12/0.04/0.0/000/00 32 NNW AERO 31 NNW RMY 33
11/13 48/38/43/0/0.30/0.0/000/00 22 NW AERO 21 NW RMY 25
11/14 49/32/41/-1/0.00/0.0/276/47 26 NW AERO 28 NW RMY 29
11/15 58/30/44/+2/0.62/0.0/311/53 60 S AERO 67 S RMY 65
11/16 53/39/46/+4/0.00/0.0/526/90 40 WNW AERO 41 WNW RMY 43
11/17 47/32/40/-1/0.00/0.0/204/35 28 NW AERO 28 NW RMY 30
11/18 32/19/26/-15/0.00/0.0/580/100 40 NW AERO 46 NW RMY 43
11/19 44/18/31/-10/0.00/0.0/393/68 37 SW AERO 39 SW RMY 43
11/20 63/44/54/+14/0.00/0.0/495/86 33 SSW AERO 35 SSW RMY 37
11/21 62/40/51/+11/0.00/0.0/339/59 24 W AERO 23 W RMY 27
11/22 45/33/39/-1/T/0.0/006/01 28 SE AERO 28 SE RMY 31
11/23 58/32/45/+6/1.77/0.0/000/00 42 WNW AERO 48 WNW RMY 46 TSTM
11/24 42/27/35/-4/0.00/0.0/569/100 31 WNW AERO 32 WNW RMY 33
11/25 50/26/38/-1/0.01/0.0/017/03 23 SSE AERO 23 SSE RMY 26
11/26 58/45/52/+14/0.36/0.0/000/00 36 S AERO 37 S RMY 41
11/27 53/46/50/+12/0.00/0.0/056/10 23 WNW AERO 23 WNW RMY 23
11/28 52/36/44/+6/T/0.0/180/32 28 WNW AERO 30 WNW RMY 27
11/29 52/33/43/+6/0.00/0.0/561/100 21 SSW AERO 21 SSW RMY 22
11/30 62/40/51/+14/1.35/0.0/000/00 81 SSE AERO 82 SSE RMY 86
DAILY RECORDS FOR NOVEMBER 2020
11/06/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 72F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1959 AND 2015
11/07/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 75F,
TIES PREVIOUS RECORD OF 75F SET IN 1938
11/08/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1938
11/09/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1975
11/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 58F,
BREAKS PREVIOUS RECORD OF 56F IN 2002
DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 68F IN 1984
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 62/40/51/+14/0.61/0.0/…/.. 60 S AERO 67 W RMY 64
12/02 42/32/37/+1/0.00/0.0/…/.. 32 SW AERO 32 SW RMY 35
12/03 49/30/40/+4/0.00/0.0/…/.. 25 SSW AERO 25 SSW RMY 28
12/04 58/40/49/+14/0.06/0.0/…/.. 35 SSW AERO 35 SSW RMY 37
12/05 42/32/37/+2/2.13/2.8/…/.. 58 NNW AERO 58 NNW RMY 67
12/06 34/26/30/-5/0.01/T/…/.. E44 WNW AERO 44 WNW RMY 49
12/07 33/22/28/-6/T/T/…/.. 24 NW AERO 26 NW RMY 26
12/08 29/22/26/-8/T/T/…/.. 24 NW AERO 25 NW RMY 28
12/09 34/19/27/-7/T/T/…/.. 16 W AERO 17 W RMY 19
12/10 42/30/36/+3/0.00/0.0/…/.. 30 WNW AERO 31 WNW RMY 29
12/11 The low since midnight is 31F, the daily normal low is 25F
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 6.0 INS. IN 1894
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