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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, FEBRUARY 4, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0654E
SUNSET: 1703E
SNOWY START GIVES WAY TO DEVELOPING SUNSHINE…
While only 0.7 inches of snow fell early this morning, it did
make the summit road rather treacherous during our early
morning ascent to the top. The morning snow now brings us
to 15.2 inches on the month and 48.6 inches on the season!
Visibility gradually improved throughout the morning hours
from 20 miles to 80 miles by the 1 PM observation. Some
sunshine was introduced mid-morning though we have seen
more clouds than sun. It seems sunshine has been very hard to
come by since last Sunday.
As high pressure builds in today, our winds have relaxed – only
reaching 17 MPH so far. It appears we will return to cloudy
and rainy weather tomorrow.
The high temperature so far today is 37F, this is 2 degrees
above the daily normal maximum of 35F. The low since midnight
is 26F, which is 9 degrees above the normal minimum of 17F.
PRELIMINARY STATS FOR JANUARY 2021
TEMPERATURE, Deg. F
Avg. Max. 35.4 [+1.6]
Avg. Min. 22.5 [+5.4]
Mean 28.9 [+3.4]
24-hour corrected mean: 28.8
Max. for month: 52F on the 16th
Min. for month: 2F on the 31st
HEATING DEGREE DAYS
Total heating units: 1114 [-112]
Total for the season: 3044 [-487]
Total for last season: 3531
PRECIPITATION, Inches
Total: 2.32 [-2.03]
Greatest in 24 hrs: N/A
SNOWFALL, Inches
Total: 7.2 [-9.9]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 11.1 mph
Avg. corrected wind speed: 11.7 mph
Prevailing wind direction: NW [25%]
Peak gust and direction: 48 ESE on the 16th
SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A
Today’s Observations:
7 A.M.
Weather: Light snow, Overcast Stratus Fractus (precipitation very light)
Temperature: 26F; Dew Point: 26F; Relative Humidity: 100%
Wind: NW @ 6 kts (wind light)
Sea-level pressure: 29.70 in Hg; rising, then rising more rapidly
Visibility: 20 miles
6-hr Max temp: 28F
6-hr Min temp: 26F
24-hr Precip: 0.02 ins.
24-hr Snow: 0.7 ins.
Snow Depth: 10 ins.
BHO SA 1155 40 OVC 20S- 057/26/26/3106/970/ PCPN VRY LGT
NEW SNW PST 24 HRS 0.7 INS WND LGT/ 8/6// 4/010 53026 6002/ 70002
10028 20026
10 A.M.
Weather: Scattered Stratocumulus, Broken Altocumulus, Broken Cirrus
Temperature: 32F; Dew Point: 24F; Relative Humidity: 72%
Wind: NNW @ 13G21 kts
Sea-level pressure: 29.75 in Hg; rising, then rising more slowly
Visibility: 80 miles
3-hr Precip: Trace
3-hr Snow: Trace
BHO SA 1455 45 SCT E120 BKN E250 BKN 80 074/32/24/3313G21/975/
NEW SNW PST 3 HRS TRACE/ 8/552 6000/ 51017
1 P.M.
Weather: Broken Stratocumulus, Broken Altocumulus
Temperature: 35F, Dew point: 24F; Relative Humidity: 63%
Wind: NNW @ 9 kts
Sea-level pressure: 29.74 in Hg, steady, then falling
Visibility: 75 miles
6-hr Max temp: 37F
6-hr Min temp: 26F
6-hr Precip: Trace
6-hr Snow: Trace
Snow Depth: 10 ins.
BHO SA 1755 40 BKN 70 BKN 75 072/35/24/3309/974/ NEW SNW PST 6 HRS TRACE/
8/550 4/010 58002 6000/ 10037 20026
SUMMARY FOR WEDNESDAY, FEBRUARY 3, 2021
TEMPERATURE (DEGREES F)
MAX…….34 NORMAL…..35
MIN…….26 NORMAL…..17
MEAN……30 NORMAL…..26
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……… +4
TOTAL DEPARTURE FOR THE MONTH…………………+11 [+3.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………35 DEPARTURE…… -4
TOTAL HEATING UNITS FOR THE MONTH…………. 106 DEPARTURE….. -12
TOTAL HEATING UNITS FOR THE SEASON…………3150 DEPARTURE…..-498
TOTAL HEATING UNITS LAST SEASON TO DATE…….3319 DEPARTURE…..-169
PEAK WIND GUST (MPH):
420C/Official…………..20 NW @ 6:24 A.M.
AEROVANE (south tower)…..20 NW @ 10:50 P.M.
ASOS…………………..22 NW @ 6:25 A.M.
DAVIS #1……………….20 NW @ 6:24 A.M.
DAVIS #2 (south tower)…..20 NW @ 11:02 P.M.
RMY……………………22 @ 3:17 P.M
VECTOR…………………21 @ 10:49 P.M.
MERLIN…………………21
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 NW @ 6:27 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 NW @ 6:31 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 NW @ 6:26 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NW @ 3:16 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..15 NNW @ 3:12 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..14 @ 3:12 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL….9.3 WNW [224 total miles]
ASOS……………….9.7
DAVIS #1……………9.6 NW
DAVIS #2……………9.8 NW
RMY………………..M
VECTOR……………..M
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.02 DEPARTURE….-0.12
ASOS………….0.02
TOTAL PRECIPITATION FOR THE MONTH………….2.80 DEPARTURE….+2.40
ASOS………….3.06
TOTAL PRECIPITATION FOR THE YEAR…………..5.12 DEPARTURE….+0.37
ASOS…………5.41
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.7 DEPARTURE…..+0.2
TOTAL SNOWFALL FOR THE MONTH………………15.2 DEPARTURE….+13.7
TOTAL SNOWFALL FOR THE SEASON……………..48.6 DEPARTURE….+14.0
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/+7/0.00/0.0/438/78 23 WNW AERO 23 WNW RMY 24
01/13 40/26/33/+8/0.00/0.0/389/69 15 SW AERO 14 SW RMY 19
01/14 38/31/35/+10/0.09/T/000/00 16 SSW AERO 16 SSW RMY 19
01/15 40/32/36/+11/0.00/0.0/266/47 25 ESE AERO 23 ESE RMY 27 TSTM
01/16 52/33/43/+18/1.00/0.0/000/00 48 ESE AERO 53 SE RMY 54
01/17 41/32/37/+12/0.00/0.0/314/55 47 W AERO 46 W RMY 54
01/18 42/27/35/+10/T/0.0/366/64 35 W AERO 37 WNW RMY 36
01/19 39/23/31/+6/T/T/293/51 25 WNW AERO 25 WNW RMY 27
01/20 37/22/30/+5/T/T/144/25 32 WNW AERO 33 WNW RMY 34
01/21 31/17/24/-1/T/0.1/081/14 23 WNW AERO 24 SSW RMY 24
01/22 42/29/36/+11/0.00/0.0/226/39 28 WNW AERO 24 WNW RMY 29
01/23 29/14/22/-3/0.00/0.0/442/76 41 WNW AERO 41 WNW RMY 46
01/24 29/13/21/-4/0.00/0.0/571/98 43 WNW AERO 48 WNW RMY 44
01/25 35/15/25/0/0.00/0.0/…/.. 28 NW AERO 29 NW RMY 30
01/26 36/20/28/+3/0.17/2.4/…/.. 18 E AERO 18 E RMY 20
01/27 33/27/30/+5/0.12/1.9/…/.. 16 NNW AERO 17 NNW RMY 17
01/28 29/13/21/-4/0.09/0.9/…/.. 39 NW AERO 48 NW RMY 42
01/29 15/4/10/-15/0.00/0.0/…/.. 44 NW AERO 46 NW RMY 50
01/30 19/3/11/-15/0.00/0.0/…/.. 24 NW AERO 28 NW RMY 27
01/31 23/2/13/-13/0.00/0.0/…/.. 18 NW AERO 18 NW RMY 19
PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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
02/01 32/21/27/+1/1.86/12.7/…/.. 53 NE AERO 65 NE RMY 62
02/02 34/29/32/+6/…./…/…/.. 52 NNE AERO 55 NE RMY 58
02/03 34/26/30/+4/…/…/…/.. 20 NW AERO 20 NW RMY 22
02/04 The low since midnight is 26F, the daily normal low is 17F
DAILY RECORDS
02/01 -RECORD SNOWFALL OF 12.7 INS, BREAKING PREVIOUS RECORD
OF 11.0 INS SET IN 1898
02/01 -RECORD PRECIPITATION OF 1.86 INS, BREAKING PREVIOUS
RECORD OF 1.30 INS SET IN 1898
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR FEBRUARY 4
HIGH 63F IN 1991
LOW -4F IN 1886, 1908
PRECIP 1.80 INS. IN 1926
SNOWFALL 15.0 INS. IN 1961
PEAK GUST 89 MPH SSE IN 1972
RECORDS FOR FEBRUARY 5
HIGH 65F IN 1991
LOW -14F IN 1918
PRECIP 1.55 INS. IN 2001
SNOWFALL 16.0 INS. IN 1907
PEAK GUST 67 MPH WNW IN 1969
TODAY’S REPORT PREPARED BY: Andrew Swanson
