Monday, February 1, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, FEBRUARY 1, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0657E
SUNSET: 1659E
SNOW STORM ARRIVES AS BLUE HILL CELEBRATES IT’S 136TH
BIRTHDAY….
February 1st, 1885 the first observation at Blue Hill was taken
and we haven’t missed a day since! The endurance and continuity
of this institution is one to be extremely proud of. All of us
here at Blue Hill Observatory take great pride in continuing
the legacy started by our founder, Abbott Lawrence Rotch, 136
years ago!
The other big story is the storm system that is affecting much
of the Mid Atlantic and Northeast. Snow began here at Blue Hill
between 4-5 A.M. this morning with 0.3″ measured at 7 A.M.
Occasional light snow continued before becoming steady between
noon and 1 P.M. An additional 0.1″ was measured at 1 P.M.
The wind has been increasing steadily through the morning into
early this afternoon with a peak gust so far of 39 MPH.
The high temperature so far today is 32F, this is 2 degrees
below the daily normal maximum of 34F. The low since midnight
is 22F, which is 5 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: 16.5 ins. on the 16th-17th
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: Overcast stratocumulus, light snow, thin smoke layer
all quadrants
Temperature: 24F; Dew Point: 20F; Relative Humidity: 84%
Wind: NNE @ 10G18 kts
Sea-level pressure: 30.18 in Hg; falling unsteadily
Visibility: 15 miles
6-hr Max temp: 26F
6-hr Min temp: 22F
24-hr Precip: 0.01 ins.
24-hr Snow: 0.3 ins.
Snow Depth: 3 ins.
BHO SA 1155 E20 OVC 15S- 220/24/20/0310G18/018/ PCPN VRY LGT
THN K LYR ALQDS TOTAL NEW SNW PST 24 HRS 0.3 INS/ 8/5// 4/003
57014 6001/ 70001 10026 20022
10 A.M.
Weather: Overcast stratocumulus, light snow
Temperature: 31F; Dew Point: 25F; Relative Humidity: 78%
Wind: ENE @ 16G28 kts, peak wind 32 MPH at 9:52 A.M.
Sea-level pressure: 30.14 in Hg; falling, then more rapidly
Visibility: 15 miles, 20 NW-NE, 8 E and SSW-WSW
3-hr Precip: Trace
3-hr Snow: Trace
BHO SA 1455 E20 OVC 15S- 206/31/25/0716G28/014/ PCPN VRY LGT
VSBY 20 NW-NE 8 E AND SSW-WSW S-B40 PK WND 0728/52/ 8/5//
58014 6000/
1 P.M.
Weather: Overcast stratocumulus, light snow
Temperature: 32F, Dew point:28F; Relative Humidity: 85%
Wind: ENE @ 21G32 kts, peak wind 37 MPH at 12:48 P.M.
Sea-level pressure: 30.01 inches Hg, falling, then more rapidly
Visibility: 3 miles, fog
6-hr Max temp: 32F
6-hr Min temp: 24F
6-hr Precip: 0.01 ins.
6-hr Snow: 0.1 ins.
Snow Depth: 2 ins.
BHO SA 1755 E27 OVC 3S-F 164/32/28/0721G32/001/ PK WND 0732/48/
TOTAL NEW SNW PST 6 HRS 0.1 INS/ 8/5// 4/003 58042 6001/ 10032 20024
SUMMARY FOR SUNDAY, JANUARY 31, 2021
TEMPERATURE (DEGREES F)
MAX…….23 NORMAL…..34
MIN……. 2 NORMAL…..17
MEAN……13 NORMAL…..26
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-13
TOTAL DEPARTURE FOR THE MONTH……………….+113 [+3.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………52 DEPARTURE……+12
TOTAL HEATING UNITS FOR THE MONTH………….1114 DEPARTURE…..-112
TOTAL HEATING UNITS FOR THE SEASON…………3044 DEPARTURE…..-487
TOTAL HEATING UNITS LAST SEASON TO DATE…….3229 DEPARTURE…..-185
PEAK WIND GUST (MPH):
420C/Official…………..18 NW @ 12:06 A.M.
AEROVANE (south tower)…..18 NW @ 12:11 A.M.
ASOS…………………..19 NW @ 12:13 A.M.
DAVIS #1……………….19 NW @ 12:13 A.M.
DAVIS #2 (south tower)…..18 NNW @ 12:12 A.M.
RMY……………………19 @ 12:12 A.M
VECTOR…………………20 @ 12:12 A.M.
MERLIN…………………N/A
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 NW @ 12:04 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 NNW @ 12:13 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 NNW @ 12:13 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NNW @ 2:50 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..14 NNW @ 12:10 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..14 @ 12:11 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…. 6.2 NW [148 total miles]
ASOS………………. 6.9 [166 total miles]
DAVIS #1…………… 7.4 NNE [178 total miles]
DAVIS #2…………… 7.2 NNE [173 total miles]
RMY……………….. 6.8 NE [163 total miles]
VECTOR…………….. 7.4 [178 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.01 DEPARTURE….-0.12
ASOS………….0.02
TOTAL PRECIPITATION FOR THE MONTH………….0.01 DEPARTURE….-0.12
ASOS………….0.02
TOTAL PRECIPITATION FOR THE YEAR…………..2.33 DEPARTURE….-2.02
ASOS…………2.37
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.3 DEPARTURE…..-0.2
TOTAL SNOWFALL FOR THE MONTH……………… 0.3 DEPARTURE…..-0.2
TOTAL SNOWFALL FOR THE SEASON……………..33.7 DEPARTURE…..+0.6
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/…./2.4/…/.. 18 E AERO 18 E RMY 20
01/27 33/27/30/+5/…./1.9/…/.. 16 NNW AERO 17 NNW RMY 17
01/28 29/13/21/-4/…/0.9/…/.. 39 NW AERO 48 NW RMY 42
01/29 15/4/10/-15/…./…/…/.. 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
02/01 The low since midnight is 22F, 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 FEBRUARY 1
HIGH 65F IN 1989
LOW -9F IN 1920
PRECIP 1.30 INS. IN 1898
SNOWFALL 11.0 INS. IN 1898
PEAK GUST 66e MPH SSW IN 1951
RECORDS FOR FEBRUARY 2
HIGH 55F IN 1951, 1973
LOW -12F IN 1961
PRECIP 1.91 INS. IN 1999
SNOWFALL 16.5 INS. IN 2015
PEAK GUST 92 MPH SW IN 1970
TODAY’S REPORT PREPARED BY: Matt Douglas and Benjamin Turner
