Saturday, December 26, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, DECEMBER 26, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
CHILLY DAY WITH CLEARING SKIES ON TOP
OF THE GREAT BLUE HILL….
Temperatures begin decreasing from
yesterday’s above average highs.
Overnight temperatures lowering to
the upper 20s around the 7 A.M
observation. Precipitation record
for yesterday was broken with a
storm total of 2.15 inches of rain.
Winds were very strong during
yesterday’s storm however no record
was broken. Winds stayed relativity
gusty during the afternoon today with
our peak gust so far reaching 29 miles
per hour. The high so far today is 27F,
9 degrees below the daily normal maximum
of 36F. The low since midnight is 27F, 6
degrees above the normal minimum of 21F.
Today’s Observations:
7 A.M.
Weather: Broken stratus
Temperature: 27F; Dew Point: 21F; Relative Humidity: 100%
Wind: SSW @ 12G20 kts
Sea-level pressure: 29.72 in Hg; steadily then rising
Visibility: 35 mile
6-hr Max temp: 34F
6-hr Min temp: 27F
24-hr Precip: 1.57 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 35 BKN 35 067/27/21/2112G20/972/ 8/600 70157
53018 10034 20027
10 A.M.
Weather: Scattered cumulus, Scattered stratus
Temperature: 29F; Dew Point: 20F; Relative Humidity: 70%
Wind: SW @ 14G23 kts
Sea-level pressure: 29.76 in Hg; steadily then rising
Visibility: 40 mile
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 40 SCT 25 SCT 250 078/29/20/2214G23/976/ 8/208 53014
1 P.M.
Weather: Few cumulus
Temperature: 30F, Dew point: 20F; Wind: W at 28G25 kts,
Sea-level pressure: 29.72 inches Hg, rising then falling
Visibility: 70 miles
6-hour max. temp: 30F
BHO SA 1755 70 CLR 066/30/20/2718G25/972/ FEW CU ALQDS 8/100
58012 10030 20027
SUMMARY FOR FRIDAY, DECEMBER 25, 2020
TEMPERATURE (DEGREES F)
MAX…….61 NORMAL…..37
MIN…….37 NORMAL…..21
MEAN……49 NORMAL…..29
DEPARTURE FROM 30-YEAR NORMAL…………………+21
TOTAL DEPARTURE FOR THE MONTH…………………+55 [+2.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………16 DEPARTURE……-7
TOTAL HEATING UNITS FOR THE MONTH…………..761 DEPARTURE……-57
TOTAL HEATING UNITS FOR THE SEASON…………1734 DEPARTURE…..-346
TOTAL HEATING UNITS LAST SEASON TO DATE…….2080 DEPARTURE…..-344
PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..68 SSE @ 8:44 A.M.
AEROVANE (south tower)…..77 SSE @ 8:42 A.M.
ASOS…………………..67 SSW @ 8:59 A.M.
DAVIS #1……………….73 S @ 8:36 A.M.
DAVIS #2 (south tower)…..78 SSE @ 8:13 A.M.
RMY……………………83.8
VECTOR…………………83.4
MERLIN…………………N/A
FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..52 SSE @ 8:18 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….46 S @ 9:00 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………47 S @ 7:41 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………53 SSE @ 8:32 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…25.4 SSE [609 total miles]
ASOS………………23.2 [557 total miles]
DAVIS #1…………..24.2 S [581 total miles]
DAVIS #2…………..26.0 S [624 total miles]
RMY……………….24.1 S [578 total miles]
VECTOR…………….24.6 [590 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….1.57 DEPARTURE….+1.41
ASOS………….1.66
TOTAL PRECIPITATION FOR THE MONTH………….5.61 DEPARTURE….+1.59
ASOS………….7.77
TOTAL PRECIPITATION FOR THE YEAR………….53.58 DEPARTURE….1.03
ASOS………..55.10
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH………………19.7 DEPARTURE….+9.5
TOTAL SNOWFALL FOR THE SEASON……………..26.2 DEPARTURE….+13.4
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 35/30/33/+1/0.10/0.4/…/.. 25 N AERO 25 N RMY 29
12/15 34/21/28/-4/0.00/0.0/…/.. 32 WNW AERO 33 WNW RMY 38
12/16 27/13/20/-11/…./1.4/…/.. 38 E AERO 37 E RMY 39
12/17 31/19/25/-6/…./15.1/…/.. 55 ENE AERO 56 ENE RMY 59
12/18 27/18/23/-8/0.00/0.0/…/.. 28 N AERO 26 N RMY 27
12/19 29/13/21/-9/0.00/0.0/…/.. 16 SW AERO 16 S RMY 16
12/20 36/24/30/0/0.02/T/…/.. 14 S AERO 16 SW RMY 14
12/21 34/29/32/+2/0.00/0.0/…/.. 22 WNW AERO 24 WNW RMY 23
12/22 42/30/36/+7/0.00/0.0/…/… 34 WNW AERO 35 WNW RMY 38
12/23 37/26/32/+3/0.00/0.0/…/.. 30 WNW AERO 28 WNW RMY 31
12/24 53/30/42/+13/…./…/…/.. 46 SSE AERO 50 SSE RMY 55
12/25 61/37/49/+21/…./…/…/.. 68 SSE AERO 77 SSE RMY 84
12/26 The low since midnight is 27F, the daily normal low is 21F
DAILY RECORDS FOR DECEMBER 2020
12/17/20: DAILY RECORD SNOWFALL OF 15.1 INCHES,
BREAKS PREVIOUS RECORD OF 7.5 INCHES SET IN 1988
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR DECEMBER 26
HIGH 58 IN 1973,1982
LOW -12 IN 1980
PRECIP 3.64 INS. IN 1969
SNOWFALL 17.5 INS. IN 1909
PEAK GUST 84 MPH SSE IN 1957
RECORDS FOR DECEMBER 27
HIGH 57 IN 1895,1949
LOW -4 IN 1903
PRECIP 2.43 INS. IN 1969
SNOWFALL 11.2 INS. IN 1947
PEAK GUST 73 S IN 2011
TODAY’S REPORT PREPARED BY: Nicholas Rousseau
