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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, DECEMBER 14, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
CLOUDY, COLD, AND WET TODAY HERE AT BLUE HILL…
What a difference a day makes! After yesterday’s mild
temperatures during which we had a high temperature
of 58 degrees, today has brought us back to the reality
that it’s mid December.
Temperatures have been stuck in the low-mid 30s all
day with light sleet, rain, and snow developing around
mid morning. The frozen precipitation types didn’t last
long, but were enough to measure 0.1″ of mainly sleet.
Light rain then continued for a few hours into early
this afternoon before a break in the action. Mixed
precipitation then re-started and has since changed to
all snow at around 3:20 this afternoon and has left
a coating so far as of the time of this discussion.
There hasn’t been much wind to speak of at all today.
We had a brief period of gusty winds between 8:45 and
9:10 this morning during which we had a peak gust of
25 MPH. But other than that, winds have generally been
less than 10 MPH most of the day. As a matter of fact,
the average speed since 7 A.M. has only been 4.6 MPH.
The high so far today is 35F, 5 degrees below the
daily normal high of 40F. The low since midnight is
31F, 7 degrees above the normal low of 24F.
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: 1.77 ins. on the 23rd
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: Broken altocumulus/altostratus, overcast cirrostratus
Temperature: 33F; Dew Point: 27F; Relative Humidity: 78%
Wind: NNW at 7 kts
Sea-level pressure: 29.95 in Hg; rising then falling
Visibility: 40 miles
6-hr Max temp: 33F
6-hr Min temp: 31F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E140 BKN 200 OVC 40 141/33/27/3407/995/ FEW BINOVC
DSNT ENE-SE-S FEW SC OFFSHR DSNT NNE-ESE VIRGA ALQDS/ 8/577
58006 10033 20031
10 A.M.
Weather: Broken stratocumulus, overcast nimbostratus, light rain
Temperature: 34F; Dew Point: 32F; Relative Humidity: 92%
Wind: Calm
Sea-level pressure: 29.97 in Hg; rising unsteadily
Visibility: 25 miles
3-hr Precip: 0.02 ins.
3-hr Snow: 0.1 ins.
BHO SA 1455 E50 BKN 70 OVC 25R- 148/34/32/0000/997/ PCPN VRY LGT
WND CALM S-B1353E05 IP-E1357 R-B1357 TOTAL NEW SNOW/SLEET
PST 3 HRS 0.1 INS/ 8/52/ 52007 6002/
1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus, light rain
Temperature: 34F; Dew Point: 34F; Relative Humidity: 100%
Wind: W at 5 kts, wind light
Sea-level pressure: 29.84 in Hg; falling, then more rapidly
Visibility: 3 miles, 6 miles NE-ESE, fog
6-hr Max temp: 35F
6-hr Min temp: 33F
6-hr Precip: 0.05 ins.
6-hr Snow: 0.1 ins.
Snow Depth: 0 ins.
BHO SA 1755 E2 BKN 25 OVC 3R-F 106/34/34/2605/984/ STFRA OCLY
DRFTG OVR SMT VSBY 6 NE-ESE IP-B25E30 WND LGT TOTAL NEW
SNOW/SLEET PST 6 HRS 0.1 INS/ 8/6// 58042 6005/ 10035 20033
SUMMARY FOR SUNDAY, DECEMBER 13, 2020
TEMPERATURE (DEGREES F)
MAX…….58 NORMAL…..40
MIN…….35 NORMAL…..25
MEAN……47 NORMAL…..32
DEPARTURE FROM 30-YEAR NORMAL………………. +15
TOTAL DEPARTURE FOR THE MONTH………………. +46 [+3.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………18 DEPARTURE……-15
TOTAL HEATING UNITS FOR THE MONTH…………..352 DEPARTURE……-46
TOTAL HEATING UNITS FOR THE SEASON…………1325 DEPARTURE…..-335
TOTAL HEATING UNITS LAST SEASON TO DATE…….1677 DEPARTURE…..-352
PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..28 W AT 7:46 P.M.
AEROVANE (south tower)…..31 WSW AT 1:48 P.M.
ASOS…………………..29 SW AT 1:52 P.M.
DAVIS #1……………….30 WSW AT 1:51 P.M.
DAVIS #2 (south tower)…..30 W AT 1:50 P.M.
RMY……………………31
VECTOR…………………31
MERLIN…………………31
FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..20 WSW AT 1:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 WSW AT 1:53 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 W AT 12:41 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 WSW AT 1:53 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL….10.8 WNW [258 total miles]
ASOS……………….11.5 [276 total miles]
DAVIS #1……………11.3 W [271 total miles]
DAVIS #2……………11.8 W [283 total miles]
RMY………………..11.1 WNW [266 total miles]
VECTOR……………..11.8 [283 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.16
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….3.19 DEPARTURE….+1.05
ASOS………….3.29
TOTAL PRECIPITATION FOR THE YEAR………….49.59 DEPARTURE….-1.08
ASOS………..50.62
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…..-1.6
TOTAL SNOWFALL FOR THE SEASON………………9.3 DEPARTURE…..+2.3
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 50/31/41/+8/0.00/0.0/…/.. 32 SW AERO 35 SW RMY 34
12/12 48/40/44/+11/0.38/0.0/…/.. 25 E AERO 21 E RMY 25
12/13 58/35/47/+15/0.00/0.0…/.. 28 W AERO 31 WSW RMY 31
12/14 The low since midnight is 31F, the daily normal low is 24F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
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
RECORDS FOR DECEMBER 15
HIGH 64 IN 1975
LOW 4 IN 1900, 1905, 1933
PRECIP 1.80 INS. IN 1981
SNOW 7.5 INS. IN 1951
PEAK GUST 65 MPH NW IN 1991
TODAY’S REPORT PREPARED BY: Matt Douglas
