Sunday, January 17, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, JANUARY 17, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0710E
SUNSET: 1640E
VERY WINDY BUT DRY TODAY ATOP GREAT BLUE HILL….
Following yesterday’s storm, today is much dryer; but just as
windy. We are experiencing frequent gusts above 30 mph, with
the highest being 45 mph so far today. Visibility was 20 this
morning due to haze, rising to 65 miles by the 1 P.M. observation.
The sky has filled in with clouds since this morning, with
conditions moving from almost clear this morning to mostly cloudy
by noontime.
Despite yesterday’s rainfall, we are still 0.34 inches below
normal for the month. Snowfall is another concern, as we are
7.1 inches below normal. This season, we are still above
average for the snow total thanks to high December snowfall.
Temperatures are continuing to be warmer than normal, especially
the overnight lows.
The high temperature so far today is 41F, 7 degrees above the
daily normal maximum of 33F. The low since midnight is 32F,
15 degrees above the normal minimum of 17F.
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus
Temperature: 32F; Dew Point: 24F; Relative Humidity: 72%
Wind: WSW @ 13G29 kts, peak wind of 34 mph at 6:12 A.M.
Sea-level pressure: 29.37 in Hg; rising steadily
Visibility: 25 miles, hazy
6-hr Max temp: 33F
6-hr Min temp: 32F
24-hr Precip: 1.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 100 SCT 25 947/32/24/2413G29/937/ HAZY PK WND
2429/12/ 8/080 70100 53018 10033 20032
10 A.M.
Weather: Scattered cirrostratus, few altocumulus
Temperature: 37F; Dew Point: 21F; Relative Humidity: 53%
Wind: WSW @ 25G27 kts, peak of 37 mph at 9:37 A.M.
Sea-level pressure: 29.44 in Hg; rising, then more rapidly
Visibility: 65 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 250 SCT 65 969/37/21/2515G27/944/ FEW AC ALQDS
PK WND 2531/37/ 8/088 51021
1 P.M.
Weather: Broken stratocumulus
Temperature: 41F, Dew point: 22F; Relative Humidity: 47%
Wind: W @ 21G31 kts, peak of 38 mph W at 12:25 P.M.
Sea-level pressure: 29.43 inches Hg, falling, then steady
Visibility: 65 miles
6-hr Max temp: 41F
6-hr Min temp: 32F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 50 BKN 65 965/41/22/2721G31/943/ PK WND 2733/25/
8/050 55004 10041 20032
SUMMARY FOR SATURDAY, JANUARY 16, 2021
TEMPERATURE (DEGREES F)
MAX…….52 NORMAL…..33
MIN…….33 NORMAL…..17
MEAN……43 NORMAL…..25
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+18
TOTAL DEPARTURE FOR THE MONTH……………….+116 [+7.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………22 DEPARTURE……-18
TOTAL HEATING UNITS FOR THE MONTH…………..513 DEPARTURE…..-115
TOTAL HEATING UNITS FOR THE SEASON…………2443 DEPARTURE…..-489
TOTAL HEATING UNITS LAST SEASON TO DATE…….2701 DEPARTURE…..-258
PEAK WIND GUST (MPH):
420C/Official…………..48 ESE @ 8:44 A.M.
AEROVANE (south tower)…..53 SE @ 9:49 A.M.
ASOS…………………..51 ESE @ 8:46 A.M.
DAVIS #1……………….53 ESE @ 8:45 A.M.
DAVIS #2 (south tower)…..49 SE @ 9:49 A.M.
RMY……………………54 @ 9:49 A.M.
VECTOR…………………57 @ 9:49 A.M.
MERLIN…………………50
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………37 ESE @ 9:52 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….35 ESE @ 8:47 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………38 ESE @ 8:12 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………38 ESE @ 9:51 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..37 S @ 8:09 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..37 @ 8:09 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…18.3 WSW [440 total miles]
ASOS………………18.1 [426 total miles]
DAVIS #1…………..18.5 SSE [408 total miles]
DAVIS #2…………..18.3 SSE [440 total miles]
RMY……………….17.4 S [418 total miles]
VECTOR…………….18.0 [424 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….1.00 DEPARTURE….+0.86
ASOS………….1.06
TOTAL PRECIPITATION FOR THE MONTH………….1.94 DEPARTURE….-0.34
ASOS………….2.00
TOTAL PRECIPITATION FOR THE YEAR…………..1.94 DEPARTURE….-0.34
ASOS…………2.00
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH……………… 1.9 DEPARTURE…..-7.1
TOTAL SNOWFALL FOR THE SEASON……………..28.1 DEPARTURE…..+3.1
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
01/16 52/33/43/+18/1.00/0.0/…/.. 48 ESE AERO 53 SE RMY 54
01/17 The low since midnight is 32F, 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 17
HIGH 55F IN 1973,1995
LOW -8F IN 1907,1982
PRECIP 1.43 INS. IN 1956
SNOWFALL 13.4 INS. IN 1956
PEAK GUST 62 MPH S IN 1994
RECORDS FOR JANUARY 18
HIGH 62F IN 1973,1990
LOW -10F IN 1982
PRECIP 1.68 INS. IN 1915
SNOWFALL 13.0 INS. IN 1948
PEAK GUST 85 MPH SSE IN 2006
TODAY’S REPORT PREPARED BY: Benjamin Turner
