Thursday, December 30, 2021

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

THURSDAY, DECEMBER 30, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0713E
SUNSET:  1621E

COLD AND FOGGY ATOP GREAT BLUE HILL….

Today was raw and cold with temps hanging in the mid 30’s accompanied
by fog and a very light drizzle. Visibility decreased from 15 miles this
morning to a 1/16th mile as fog increased. Rainfall since the 7 A.M.
observation is only 0.01 inches. The temperature varied very little
today with a max of 39F and a minimum of 36F so far.

The high so far today is 37F, which is the same as the normal max.
The low since midnight is 36F, which is 15 degrees above
the normal low of 21F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 37F; Dew Point: 34F; Relative Humidity: 87%
Wind: E @ 7 kts
Sea-level pressure: 1014.9 mb; 29.97 in. Hg: rising then more slowly
Visibility: 15 miles, thin fog
6-hr Max temp: 38F
6-hr Min temp: 36F
24-hr Precip:  0.01 ins.
24-hr Snowfall: Trace
Snow Depth: 0 ins.
BHO SA 1155 40 OVC 15 149/37/34/0907/997/ THN F ALQDS NEW SNW PST
24 HRS TRACE/ 8/6// 51005 70001 10038 20036

10 A.M.
Weather: Overcast stratus, very light drizzle
Temperature: 38F; Dew Point: 38F; Relative Humidity: 100%
Wind: NE @ 7 kts
Sea-level pressure: 1014.7 mb; 29.97 in Hg; falling then rising
Visibility: 1 mile, fog
3-hr Precip:  Trace
3-hr Snowfall: 0.0 ins.
BHO SA 1455 15 OVC 1L-F 147/38/38/0407/997/ 8/6// 55002 6000/

1 P.M.
Weather: Fog and light drizzle
Temperature: 37F, Dew point: 37F; Relative Humidity: 100%
Wind: NE @ 4 kts, wind light and variable
Sea-level pressure: 1013.1 mb; 29.92 in Hg; falling unsteadily
Visibility: 1/16th mile, fog
6-hr Max temp: 39F
6-hr Min temp: 36F
6-hr Precip:   0.01 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 X W3 1/16L-F 131/37/37/0404/992/ WND L/V/ 8//// 57016 6001/
10039 20036

SUMMARY FOR WEDNESDAY, DECEMBER 29, 2021

TEMPERATURE (DEGREES F)
MAX…….40     NORMAL…..37
MIN…….32     NORMAL…..21
MEAN……36     NORMAL…..29

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+7
TOTAL DEPARTURE FOR THE MONTH………………………+105 [+3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………29  DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH…………..828  DEPARTURE……-106
TOTAL HEATING UNITS FOR THE SEASON…………1835  DEPARTURE……-303
TOTAL HEATING UNITS LAST SEASON TO DATE…….1866 DEPARTURE……..-31

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….13 WSW @ 12:31 P.M.
AEROVANE……………….12 WSW @ 12:30 P.M.
VECTOR #2 (Instantaneous)..13     @ 12:31 P.M.
DAVIS #2 ………………13 W   @ 12:31 P.M.
RMY #2 (Instantaneous)…..13 WSW @ 12:31 P.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……………….7 WSW @ 12:30 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE……………9     @ 12:32 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………….9 WSW @ 12:32 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE………………9 WSW @ 12:32 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……3.3 ENE  [80 total miles] VECTOR #2…………….4.2
DAVIS #2……………..3.6 NE
RMY #2……………….4.2 NNE
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…….0.01  DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH………….2.56  DEPARTURE…..-2.51
TOTAL PRECIPITATION FOR THE YEAR………….59.33  DEPARTURE…..+6.05

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..TRACE  DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH……………….1.7  DEPARTURE……-9.8
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.7  DEPARTURE…..-11.3

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 The low since midnight is 36F, 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 30
HIGH 60 IN 1984
LOW -18 IN 1933
PRECIP 1.54 INS. IN 1942
SNOWFALL 7.5 INS. IN 1956
PEAK GUST 81 MPH WNW IN 1962

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

TODAY’S REPORT PREPARED BY: Benjamin Turner