Sunday, February 28, 2021

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

SUNDAY, FEBRUARY 28, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0622E
SUNSET:  1733E

OVERCAST WITH LIGHT WIND AND DECENT VISIBILITY
ATOP GREAT BLUE HILL….

Rain totaled 0.21 inches yesterday, with a snow total of
0.1 inches being measured that morning. Today was overcast
with a light wind from the southwest. Visibility was decent
at 65 miles on average, and the ponds stayed frozen through
yesterday’s rain.

The high so far today is 41F, a degree above the daily
average max of 40F. The low since midnight is 33F,
11 degrees above the daily average low of 22F.

Today’s Observations:

7 A.M.
Weather: Overcast cirrostratus
Temperature: 34F; Dew Point: 31F; Relative Humidity: 89%
Wind: W @ 9 kts
Sea-level pressure: 30.30 in Hg; falling then rising
Visibility: 65 miles
6-hr Max temp: 36F
6-hr Min temp: 33F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 4 ins.
BHO SA 1155 250 OVC 65 260/34/31/2809/030/ SUN DMLY VSBL NEW
SNW PST 24 HRS 0.1 INS/ 8/008 4/004 51023 10036 20033

10 A.M.
Weather: Overcast cirrostratus
Temperature: 37F; Dew Point: 32F; Relative Humidity: 82%
Wind: W @ 4 kts, light and variable
Sea-level pressure: 30.35 in Hg; rising steadily
Visibility: 65 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 250 OVC 65 276/37/32/2604/035/ WND L/V/ 8/008 51016

1 P.M.
Weather: Scattered altocumulus, overcast cirrostratus
Temperature: 40F, Dew point: 31F; Relative Humidity: 69%
Wind: WSW @ 7 kts
Sea-level pressure: 30.30 in Hg; falling steadily
Visibility: 65 miles
6-hr Max temp: 41F
6-hr Min temp: 34F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 4 ins.
BHO SA 1755 180 SCT 220 OVC 65 260/40/31/2507/030/ 8/078 4/004
58016 10041 20034

SUMMARY FOR SATURDAY, FEBRUARY 27, 2021

TEMPERATURE (DEGREES F)
MAX…….47   NORMAL…..40
MIN…….29   NORMAL…..22
MEAN……38   NORMAL…..31

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +7
TOTAL DEPARTURE FOR THE MONTH……………….+21 [+0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………27  DEPARTURE…… -7
TOTAL HEATING UNITS FOR THE MONTH…………..973  DEPARTURE……-30
TOTAL HEATING UNITS FOR THE SEASON…………4017  DEPARTURE…..-517
TOTAL HEATING UNITS LAST SEASON TO DATE…….4068  DEPARTURE……-51

PEAK WIND GUST (MPH):
420C/Official…………..40 SSE @  1:22 P.M.
AEROVANE (south tower)…..41 SSE @  1:32 P.M.
ASOS…………………..39 SSE @  1:24 P.M.
DAVIS #1……………….43 S   @  1:24 P.M.
DAVIS #2 (south tower)…..46 SSE @  1:22 P.M.
RMY……………………44     @  1:22 P.M.
VECTOR…………………46     @  1:29 P.M.
MERLIN…………………41

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………30 SSE @  1:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 SSE @  1:24 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………29 SSE @  1:23 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………30 SSE @  1:23 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..27 S   @  1:12 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..28     @  1:00 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……16.0 SSE  [385 total miles] ASOS…………………14.6
DAVIS #1……………..16.2 SSW
DAVIS #2……………..16.9 S
RMY………………….15.4 SSW
VECTOR……………….14.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.21  DEPARTURE….+0.05
ASOS………….0.25
TOTAL PRECIPITATION FOR THE MONTH………….5.67  DEPARTURE….+1.77
ASOS………….5.90
TOTAL PRECIPITATION FOR THE YEAR…………..7.99  DEPARTURE….-0.26
ASOS…………8.25

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.1  DEPARTURE…. -0.4
TOTAL SNOWFALL FOR THE MONTH………………39.0  DEPARTURE….+25.6
TOTAL SNOWFALL FOR THE SEASON……………..72.4  DEPARTURE….+25.9

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/+1/1.86/12.7/000/00      53 NE   AERO 65 NE   RMY 62
02/02   34/29/32/+6/0.91/1.6/000/00       52 NNE  AERO 55 NE   RMY 58
02/03   34/26/30/+4/0.01/0.2/036/06       20 NW   AERO 20 NW   RMY 22
02/04   37/26/32/+6/0.02/0.7/158/26       23 NW   AERO 22 NW   RMY M
02/05   39/26/33/+7/0.01/T/000/00         33 S    AERO 32 S    RMY 30
02/06   40/28/34/+8/0.00/0.0/595/97       42 WSW  AERO 41 WSW  RMY 47
02/07   35/25/30/+3/0.71/11.6/000/00      27 WNW  AERO 28 WNW  RMY 30
02/08   27/13/20/-7/0.00/0.0/619/100      29 NW   AERO 31 WNW  RMY 32
02/09   27/18/23/-4/0.17/2.2/000/00       16 N    AERO 16 N    RMY 17
02/10   31/15/23/-4/0.00/0.0/…/..       26 WNW  AERO 25 WNW  RMY 28
02/11   31/15/23/-4/0.00/0.0/…/..       28 NW   AERO 26 NW   RMY 31
02/12   25/8/17/-10/0.00/0.0/…/..       32 NW   AERO 35 NW   RMY 36
02/13   27/15/21/-7/0.00/0.0/…/..       20 NNW  AERO 20 NNW  RMY 23
02/14   34/24/29/+1/0.00/0.0/…/..       19 ENE  AERO 16 ENE  RMY 19
02/15   31/27/29/+1/0.11/0.0/…/..       21 NNE  AERO 21 NNE  RMY 22
02/16   44/29/37/+9/0.63/0.0/…/..       39 W    AERO 41 W    RMY 43
02/17   30/19/25/-3/0.00/0.0/…/..       40 W    AERO 41 WNW  RMY 40
02/18   29/21/25/-4/0.13/1.7/…/..       24 ENE  AERO 24 ENE  RMY 25
02/19   30/24/27/-2/0.66/7.7/…/..       24 NE   AERO 23 NE   RMY 24
02/20   32/19/26/-3/0.02/0.5/…/..       32 NW   AERO 35 NW   RMY 38
02/21   33/15/24/-5/0.00/0.0/…/..       27 NW   AERO 28 NW   RMY 29
02/22   40/21/31/+2/0.22/T/…/..         41 S    AERO 41 SSE  RMY 44
02/23   43/31/37/+7/0.00/0.0/…/..       31 WNW  AERO 31 WNW  RMY 32
02/24   49/34/42/+12/0.00/0.0/…/..      39 SSW  AERO 39 SSW  RMY 42
02/25   43/28/30/+6/0.00/0.0/…/..       50 WNW  AERO 55 WNW  RMY 57
02/26   40/22/31/+1/0.00/0.0/…/..       22 WNW  AERO 22 WNW  RMY 21
02/27   47/29/38/+7/0.21/0.1/…/..       40 SSE  AERO 41 SSE  RMY 44

02/28 The low since midnight is 33F, the daily normal low is 22F

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 28
HIGH 62F IN 1976
LOW -2F IN 1907,1934
PRECIP 1.79 INCHES IN 1958
SNOWFALL 8.5 INCHES IN 2005
PEAK GUST 88e MPH SSW IN 1943

RECORDS FOR MARCH 1
HIGH 62 IN 1972
LOW -3 IN 1886
PRECIP 1.65 INS. IN 1900
SNOWFALL 9.4 INS. IN 1949
PEAK GUST 78 WSW IN 1966

TODAY’S REPORT PREPARED BY: Benjamin Turner