Wednesday, January 20, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JANUARY 20, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0708E
SUNSET: 1643E
MOSTLY CLOUDY WITH LIMITED VISIBILITY ATOP
GREAT BLUE HILL….
Today was on the hazier side, only allowing 45 miles for
the maximum visibility. Skies were mostly cloudy, opening
up slightly in the early afternoon. A quick snow shower
moved in around 2 P.M., ending shortly after it started.
The stretch of above normal temperatures continues as well.
Today will likely mark the 31st consecutive day of above
normal temperatures, stretching back to December 21st!
-Temperature section written by Matt Douglas
The high temperature so far today is 36F, this is 3 degrees
above the daily normal maximum of 33F. The low since midnight
is 28F, 11 degrees above the normal minimum of 17F.
Today’s Observations:
7 A.M.
Weather: Overcast altostratus
Temperature: 29F; Dew Point: 20F; Relative Humidity: 70%
Wind: WSW @ 5 kts, light
Sea-level pressure: 29.85 in Hg; falling unsteadily
Visibility: 25 miles, hazy
6-hr Max temp: 29F
6-hr Min temp: 28F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 100 OVC 25 110/29/20/2505/985/ HAZY WND LGT/ 8/02/
56018 10029 20028
10 A.M.
Weather: Overcast altostratus
Temperature: 31F; Dew Point: 22F; Relative Humidity: 68%
Wind: WNW @ 5 kts, light
Sea-level pressure: 29.84 in Hg; rising, then falling
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 100 OVC 30 106/31/22/2905/984/ HAZY WND LGT/ 8/02/
57004
1 P.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 35F, Dew point: 20F; Relative Humidity: 54%
Wind: NW @ 10G16 kts
Sea-level pressure: 29.78 inches Hg, falling unsteadily
Visibility: 45 miles
6-hr Max temp: 36F
6-hr Min temp: 29F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 70 SCT 250 BKN 45 088/35/20/3310G16/978/ 8/086 56018
10036 20029
SUMMARY FOR TUESDAY, JANUARY 19, 2021
TEMPERATURE (DEGREES F)
MAX…….39 NORMAL…..33
MIN…….23 NORMAL…..17
MEAN……31 NORMAL…..25
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+6
TOTAL DEPARTURE FOR THE MONTH……………….+177 [+9.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34 DEPARTURE……-6
TOTAL HEATING UNITS FOR THE MONTH…………..605 DEPARTURE…..-143
TOTAL HEATING UNITS FOR THE SEASON…………2535 DEPARTURE…..-517
TOTAL HEATING UNITS LAST SEASON TO DATE…….2830 DEPARTURE…..-295
PEAK WIND GUST (MPH):
420C/Official…………..25 WNW @ 12:07 P.M.
AEROVANE (south tower)…..25 WNW @ 11:28 A.M.
ASOS…………………..24 WNW @ 12:06 P.M.
DAVIS #1……………….25 WNW @ 12:06 P.M.
DAVIS #2 (south tower)…..26 WNW @ 12:07 P.M.
RMY……………………27 @ 3:55 P.M.
VECTOR…………………27 @ 3:55 P.M.
MERLIN…………………26
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 WNW @ 12:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 WNW @ 12:08 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 NW @ 12:08 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 NW @ 12:08 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..18 NW @ 12:06 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..18 @ 12:05 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…10.9 WNW [261 total miles]
ASOS………………10.5 [253 total miles]
DAVIS #1…………..11.7 WNW [280 total miles]
DAVIS #2…………..11.9 WNW [286 total miles]
RMY……………….10.3 WNW [246 total miles]
VECTOR…………….11.0 [257 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.13
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.94 DEPARTURE….-0.76
ASOS………….2.00
TOTAL PRECIPITATION FOR THE YEAR…………..1.94 DEPARTURE….-0.76
ASOS…………2.00
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…..-0.6
TOTAL SNOWFALL FOR THE MONTH……………… 1.9 DEPARTURE…..-8.8
TOTAL SNOWFALL FOR THE SEASON……………..28.1 DEPARTURE…..+1.4
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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
01/01 36/25/31/+4/0.06/0.3/330/60 23 E AERO 23 NNW RMY 23
01/02 43/30/37/+10/0.30/T/116/21 37 WNW AERO 39 WNW RMY 44
01/03 33/27/30/+4/0.07/0.8/000/00 23 NNE AERO 22 NNE RMY 25
01/04 37/28/33/+7/0.01/0.1/110/20 25 NNE AERO 23 NNE RMY 27
01/05 31/28/30/+4/0.05/0.7/000/00 21 NNW AERO 21 NNW RMY 22
01/06 38/28/33/+7/T/T/244/44 30 NW AERO 29 NW RMY 32
01/07 42/26/34/+8/0.00/0.0/516/93 28 NNW AERO 26 NNW RMY 31
01/08 40/21/31/+5/0.00/0.0/517/93 25 NNW AERO 22 NNW RMY 25
01/09 34/30/27/+1/0.00/0.0/395/71 25 N AERO 23 N RMY 24
01/10 39/24/32/+7/0.00/0.0/493/88 25 NNW AERO 23 NNW RMY 24
01/11 34/25/30/+5/0.00/0.0/000/00 17 SW AERO 16 SSW RMY 16
01/12 40/24/32/+7/0.00/0.0/…/.. 23 WNW AERO 23 WNW RMY 24
01/13 40/26/33/+8/0.00/0.0/…/.. 15 SW AERO 14 SW RMY 19
01/14 38/31/35/+10/0.09/T/…/.. 16 SSW AERO 16 SSW RMY 19
01/15 40/32/36/+11/0.00/0.0/…/.. 25 ESE AERO 23 ESE RMY 27 TSTM
01/16 52/33/43/+18/1.00/0.0/…/.. 48 ESE AERO 53 SE RMY 54
01/17 41/32/37/+12/0.00/0.0/…/.. 47 W AERO 46 W RMY 54
01/18 42/27/35/+10/T/0.0/…/.. 35 W AERO 37 WNW RMY 36
01/19 39/23/31/+6/…./…/…/.. 25 WNW AERO 25 WNW RMY 27
01/20 The low since midnight is 28F, the daily normal low is 17F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978
PEAK GUST 76e MPH NE IN 1978
RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888,1893
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979
TODAY’S REPORT PREPARED BY: Benjamin Turner
