Sunday, February 7, 2021

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SUNDAY, FEBRUARY 7, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0651E
SUNSET:  1706E

AN OVERCAST DAY WITH SOME SNOW STARTING UP
AROUND NOONTIME….

We observed overcast conditions and limited visibility
this morning that became snow a little before 11 A.M.
Visibility went from 35 miles this morning to just a
1/16th mile in a matter of hours. The snow amount so
far is 2.0 inches, measured at 1 P.M. The snow is
incredibly fluffy, as it only melted down to 0.07 inches
of liquid.

The high so far today is 40F, 5 degrees above the daily
average max of 35F. The low since midnight is 28F, 10
degrees above the normal minimum of 18F.

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: Overcast altostratus
Temperature: 30F; Dew Point: 20F; Relative Humidity: 65%
Wind: E @ 11 kts
Sea-level pressure: 30.13 in Hg; rising then falling
Visibility: 35 miles, hazy
6-hr Max temp: 30F
6-hr Min temp: 28F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 7 ins.
BHO SA 1155 130 OVC 35 204/30/20/0811/013/ HAZY/ 8/02/ 4/007
55011 10030 20028

10 A.M.
Weather: Overcast altostratus
Temperature: 35F; Dew Point: 24F; Relative Humidity: 63%
Wind: E @ 10 kts
Sea-level pressure: 30.05 in Hg; falling then more rapidly
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 90 OVC 35 179/35/24/0910/005/ HAZY/ 8/02/ 58025

1 P.M.
Weather: Snow
Temperature: 31F, Dew point: 31F; Relative Humidity: 100%
Wind: N @ 7 kts
Sea-level pressure: 29.93 in Hg, falling, then more rapidly
Visibility: 1/16th mile, fog
6-hr Max temp: 35F
6-hr Min temp: 30F
6-hr Precip: 0.07 ins.
6-hr Snow: 2.0 ins.
Snow Depth: 9 ins.
BHO SA 1755 X W3 1/16SF 134/31/31/0107/993/ SCTD NEW SNW PST
6 HRS 2.0 INS/ 8//// 4/009 6007/ 58045 10035 20030

SUMMARY FOR SATURDAY, FEBRUARY 6, 2021

TEMPERATURE (DEGREES F)
MAX…….40   NORMAL…..35
MIN…….25   NORMAL…..18
MEAN……34   NORMAL…..26

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……… +8
TOTAL DEPARTURE FOR THE MONTH…………………+32 [+5.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE…… -8
TOTAL HEATING UNITS FOR THE MONTH…………. 202  DEPARTURE….. -32
TOTAL HEATING UNITS FOR THE SEASON…………3246  DEPARTURE…..-519
TOTAL HEATING UNITS LAST SEASON TO DATE…….3405  DEPARTURE…..-159

PEAK WIND GUST (MPH):
420C/Official…………..42 WSW @  2:16 P.M.
AEROVANE (south tower)…..41 WSW @ 12:36 P.M.
ASOS…………………..41 W   @  2:17 P.M.
DAVIS #1……………….41 WSW @ 11:43 A.M.
DAVIS #2 (south tower)…..41 WSW @ 11:43 A.M.
RMY……………………47     @  1:49 P.M
VECTOR…………………45     @  1:50 P.M.
MERLIN…………………42

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 W   @  2:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 W   @  2:18 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………29 WSW @ 12:30 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………29 WSW @ 12:30 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..28 W   @  2:16 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..28     @  1:42 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL….15.2 WSW [364 total miles] ASOS……………….15.1
DAVIS #1……………15.6 WSW
DAVIS #2……………15.6 WSW
RMY………………..14.2 W
VECTOR……………..14.5

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………….2.81  DEPARTURE….+2.00
ASOS………….3.07
TOTAL PRECIPITATION FOR THE YEAR…………..5.13  DEPARTURE….-0.03
ASOS…………5.42

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH………………15.2  DEPARTURE….+12.2
TOTAL SNOWFALL FOR THE SEASON……………..48.6  DEPARTURE….+12.5

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   37/26/32/+6/0.02/0.7/…/..       23 NW   AERO 22 NW   RMY M
02/05   39/26/33/+7/0.01/T/…/..         33 S    AERO 32 S    RMY 30
02/06   40/28/34/+8/0.00/0.0/…/..       42 WSW  AERO 41 WSW  RMY 47

02/07 The low since midnight is 28F, the daily normal low is 18F

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 7
HIGH 51F IN 1951,1953
LOW -8F IN 1910
PRECIP 2.12 INS. IN 1983
SNOWFALL 17.1 INS. IN 1978 [BLIZZARD OF 1978] PEAK GUST 87e MPH SSE IN 1951

RECORDS FOR FEBRUARY 8
HIGH 60F IN 1933
LOW -9F IN 1934
PRECIP 2.50 INS. IN 1945
SNOWFALL 16.1 INS. IN 2013
PEAK GUST 63e MPH NE IN 1945, 2013

TODAY’S REPORT PREPARED BY: Benjamin Turner