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Friday, December 31, 2021

December 31, 2021

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, DECEMBER 31, 2021 ALL TIMES ARE…

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

FRIDAY, DECEMBER 31, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0713E
SUNSET:  1622E

DAMP, DREARY AND FOGGY WEATHER CONTINUES ATOP THE HILL….

A near carbon copy of yesterday is persisting into our New
Year’s Eve. We continue to see visibility largely under a mile
with dense fog, occasional drizzle and light winds. Temps
are a bit milder today thanks to a direction more so
out of the southwest. Speaking of wind, it has once again
been unusually light for this time of the year. Yesterday’s
average was just 4.4 MPH. Today, we recorded no passing miles
from 12p to 1p. The air has been quite calm of late.

In other news, many of our observations for December have seen
considerable cloudiness in what has become a month with
notably limited sunshine. Temps will finish well above
normal while our snowfall department will wrap up well
below the 1991-2021 norm.

The high so far today is 43F, which is 7 degrees above
the normal high of 36. The low since midnight is 38F, which
is 17 degrees above the normal low of 21F.

————————————————————–

Today’s Observations:

7 A.M.
Weather:  Sky obscured, Vertical Visibility 300ft, Fog
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: NE @ 3 kts (wind light)
Sea-level pressure: 1014.0 mb; 29.94 in. Hg: rising unsteadily
Visibility: 1/16 mile
6-hr Max temp: 40F
6-hr Min temp: 39F
24-hr Precip:  0.07 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W3 1/16F 140/40/40/0404/994/ WND LGT/ 8//// 52005 70007
10040 20039

10 A.M.
Weather: Sky obscured, Vertical Visibility 200ft, Very Light Drizzle, Fog
Temperature: 41F; Dew Point: 41F; Relative Humidity: 100%
Wind: NW @ 1 kts (wind light)
Sea-level pressure: 1015.7 mb; 29.99 in Hg; rising unsteadily
Visibility: 1/16 mile
3-hr Precip:  Trace
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W2 1/16L-F 157/41/41/3201/999/ PCPN VRY LGT WND LGT/
8//// 52017 6000/

1 P.M.
Weather: Overcast Stratus Fractus
Temperature: 42F, Dew point: 38F; Relative Humidity: 84%
Wind: Calm
Sea-level pressure: 1014.1 mb; 29.95 in Hg; falling unsteadily
Visibility: 20 miles, thin fog
6-hr Max temp: 43F
6-hr Min temp: 39F
6-hr Precip:   Trace
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 60 OVC 20 141/42/38/0000/995/ THN F ALQDS WND CALM/
8/6// 57016 6000/ 10043 20039

SUMMARY FOR THURSDAY, DECEMBER 30, 2021

TEMPERATURE (DEGREES F)
MAX…….39     NORMAL…..37
MIN…….36     NORMAL…..21
MEAN……38     NORMAL…..29

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..+9
TOTAL DEPARTURE FOR THE MONTH………………………+114 [+3.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………27  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..855  DEPARTURE……-115
TOTAL HEATING UNITS FOR THE SEASON…………1862  DEPARTURE……-312
TOTAL HEATING UNITS LAST SEASON TO DATE…….1901 DEPARTURE……..-39

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….11 N   @ 11:28 A.M.
AEROVANE……………….13 SE  @  4:38 A.M.
VECTOR #2 (Instantaneous)..12     @ 11:28 A.M.
DAVIS #2 ………………11 ESE @  4:29 A.M.
RMY #2 (Instantaneous)…..11 SE  @  4:41 A.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL……………….9 SE  @  4:42 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..10     @  4:43 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………10 ESE @  4:30 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..10 SE  @  4:43 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE…..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……4.4 NE  [105 total miles] VECTOR #2…………….5.3
DAVIS #2……………..4.7 NE
RMY #2……………….5.2 NE
RMY #1…………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.07  DEPARTURE…..-0.09
TOTAL PRECIPITATION FOR THE MONTH………….2.63  DEPARTURE…..-2.60
TOTAL PRECIPITATION FOR THE YEAR………….59.40  DEPARTURE…..+5.96

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0  DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH……………….1.7  DEPARTURE…..-10.4
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.7  DEPARTURE…..-11.9

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/01   44/30/37/0.00/0.0/263/47          35 W   AERO 35 W   RMY 34
12/02   58/35/47/10/T/0.0/106/19          56 WNW AERO 59 WNW RMY 62 TSTM
12/03   41/28/35/-1/0.00/0.0/512/92       46 NW  AERO 44 NW  RMY 46
12/04   39/25/32/-4/0.00/0.0/233/42       25 SW  AERO 23 SW  RMY 26
12/05   45/32/39/+3/0.00/0.0/460/83       25 SE  AERO 25 SE  RMY 25
12/06   59/37/48/+13/0.34/0.0/077/14      59 WNW AERO 59 NW  RMY 60
12/07   40/29/35/0/T/0.0/436/79           47 WNW AERO 36 WNW RMY 48
12/08   34/25/30/-5/0.05/0.6/000/00       26 NNE AERO 25 NE  RMY 26
12/09   35/20/28/-6/0.05/0.6/319/58       32 NW  AERO 30 NW  RMY 33
12/10   43/27/35/+1/0.00/0.0/000/00       21 SE  AERO 20 SE  RMY 21
12/11   62/37/50/+16/0.34/0.0/000/00      57 SSW AERO 59 SSW RMY 58
12/12   58/36/47/+13/0.05/0.0/416/76      55 WNW AERO 55 WNW RMY 58
12/13   50/35/43/+10/0.00/0.0/224/41      32 WSW AERO 33 WSW RMY 33
12/14   50/33/42/+9/0.00/0.0/442/81       31 WSW AERO 30 WSW RMY 32
12/15   42/28/35/+2/T/0.0/153/28          35 SSE AERO 35 SSE RMY 36
12/16   58/42/50/+18/0.21/0.0/016/03      35 SW  AERO 37 SW  RMY 38
12/17   56/39/48/+16/0.00/0.0/518/95      43 WNW AERO 41 WNW RMY 46
12/18   39/31/35/+3/0.52/0.2/000/00       21 NNW AERO 20 NNW RMY 20
12/19   39/20/30/-2/0.39/0.0/082/15       35 NNW AERO 37 NNW RMY 36
12/20   32/15/24/-7/0.00/0.0/528/97       29 SSW AERO 30 SSW RMY 30
12/21   40/27/34/+3/0.00/0.0/371/68       31 SW  AERO 32 SW  RMY 33
12/22   45/30/38/+7/0.10/0.0/038/07       47 NW  AERO 45 NW  RMY 47
12/23   30/21/26/-5/0.00/0.0/441/81       39 NW  AERO 38 NW  RMY 37
12/24   25/20/23/-7/0.01/0.1/000/00       14 N   AERO 13 N   RMY 14
12/25   34/25/30/0/0.34/0.0/000/00        20 NNW AERO 20 NNW RMY 18
12/26   37/30/34/+4/0.09/T/120/22         37 NW  AERO 37 NW  RMY 37
12/27   33/26/30/0/T/T/071/13             32 NW  AERO 35 NW  RMY 35
12/28   42/30/36/+7/…./0.1/…/..       34 NW  AERO 32 NW  RMY 35
12/29   40/32/36/+7/…./T/…/..         13 WSW AERO 12 WSW RMY 13
12/30   39/36/38/+9/…./0.0/…/..       11 N   AERO 13 SE  RMY 11

12/31  The low since midnight is 39F, the daily normal low is 21F

DAILY RECORDS FOR DECEMBER 2021

12/16/21: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 42F
TIES PREVIOUS RECORD OF 42F SET IN 1982

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR DECEMBER 31
HIGH 62 IN 1965
LOW -12 IN 1917
PRECIP 0.96 INS. IN 1906
SNOWFALL 7.5 INS. IN 2008
PEAK GUST 78 MPH NW IN 1990

RECORDS FOR JANUARY 1
HIGH 58F IN 1966
LOW -6F IN 1918
PRECIP 1.45 INS. IN 1982
SNOWFALL 7.2 INS. IN 1938
PEAK GUST 90e MPH S IN 1945

TODAY’S REPORT PREPARED BY: Andrew Swanson

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Please read the full Policy before accessing Observatory data · Effective January 1, 2025

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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