Sunday, December 26, 2021

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

SUNDAY, DECEMBER 26, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0712E
SUNSET:  1618E

MORE ICING OBSERVED OVERNIGHT, CLOUDY BUT A BIT DRIER TODAY….

Light rain and drizzle last evening became freezing drizzle/rain
as the temperature snuck just below freezing. Several hours of
light freezing rain occurred before ending as a period of light
snow around 5am. 0.10″ of ice accretion was measured this
morning, but only a trace of snow.

Somewhat drier air has moved into the area, at the very least
we’re no longer in the fog. Visibility has slowly improved to
around 50 miles, but the sky remains on the cloudy side.

The wind has gotten busier as the day has progressed gusting over
30 mph at times early this afternoon. The average speed for the
day has bumped up to around 10mph.

The high so far today is 37F, which is 1 degree below the normal
max of 38F. The low since midnight is 31F, which is 9 degrees above
the normal low of 22F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Partially obscured, overcast stratus
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: NNW @ 7 kts
Sea-level pressure: 1005.0 mb; 29.68 in. Hg: rising, then more rapidly
Visibility: 1/4 mile, freezing fog
6-hr Max temp: 32F
6-hr Min temp: 31F
24-hr Precip:  0.43 ins.
24-hr Snowfall: Trace
Snow Depth: 0 ins.
BHO SA 1155 -X E35 OVC 1/4ZF 050/32/32/3407/968/ TOTAL ICE ACC
PST 24 HRS 0.10 INS TOTAL NEW SNW PST 24 HRS TRACE/ 8/6// 53017 6008/
70043 10032 20031

10 A.M.
Weather: Scattered stratocumulus, broken altocumulus
Temperature: 35F; Dew Point: 33F; Relative Humidity: 92%
Wind: NW @ 11G17 kts
Sea-level pressure: 1008.4 mb; 29.78 in Hg; rising, then more slowly
Visibility: 40 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 12 SCT E65 BKN 40 084/35/33/3211G17/978/ 8/550 51034

1 P.M.
Weather: Scattered stratocumulus, overcast stratocumulus
Temperature: 35F, Dew point: 32F; Relative Humidity: 88%
Wind: NW @ 15G24 kts, peak wind NW 36 mph at 12:20 P.M.
Sea-level pressure: 1008.9 mb; 29.79 in Hg; rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 37F
6-hr Min temp: 32F
6-hr Precip:   0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 20 SCT E30 OVC 50 089/35/32/3115G24/979/ PK WND 3131/20/
8/5// 51005 10037 20032

SUMMARY FOR SATURDAY, DECEMBER 25, 2021

TEMPERATURE (DEGREES F)
MAX…….34     NORMAL…..38
MIN…….25     NORMAL…..22
MEAN……30     NORMAL…..30

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………  0
TOTAL DEPARTURE FOR THE MONTH………………………+87 [+3.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE…….. 0
TOTAL HEATING UNITS FOR THE MONTH…………..704  DEPARTURE…….-88
TOTAL HEATING UNITS FOR THE SEASON…………1711  DEPARTURE……-284
TOTAL HEATING UNITS LAST SEASON TO DATE…….1734 DEPARTURE……..-23

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….20 NNW @ 11:20 P.M.
AEROVANE……………….20 NNW @ 11:07 P.M.
VECTOR #2 (Instantaneous)..19     @ 11:20 P.M.
DAVIS #2 ………………17 NE  @  2:00 P.M.
RMY #2 (Instantaneous)…..18 NE  @  2:14 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………………16 NNW @ 11:25 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15     @ 11:39 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 ENE @  2:07 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 NE  @  2:07 P.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….. 8.5 NNW  [204 total miles] VECTOR #2…………… 9.0
DAVIS #2……………. 8.6 NNE
RMY #2……………… 8.6 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…….0.43  DEPARTURE…..+0.26
TOTAL PRECIPITATION FOR THE MONTH………….2.49  DEPARTURE…..-1.94
TOTAL PRECIPITATION FOR THE YEAR………….59.26  DEPARTURE…..+6.62

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..TRACE  DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH……………….1.5  DEPARTURE……-8.0
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.5  DEPARTURE……-9.5

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/…/..       35 NNW AERO 37 NNW RMY 36
12/20   32/15/24/-7/0.00/0.0/…/..       29 SSW AERO 30 SSW RMY 30
12/21   40/27/34/+3/0.00/0.0/…/..       31 SW  AERO 32 SW  RMY 33
12/22   45/30/38/+7/0.10/0.0/…/..       47 NW  AERO 45 NW  RMY 47
12/23   30/21/26/-5/0.00/0.0/…/..       39 NW  AERO 38 NW  RMY 37
12/24   25/20/23/-7/0.01/0.1/…/..       14 N   AERO 13 N   RMY 14
12/25   34/25/30/0/0.34/0.0/…/..        20 NNW AERO 20 NNW RMY 18

12/26 The low since midnight is 31F, the daily normal low is 22F

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 26
HIGH 58 IN 1973,1982
LOW -12 IN 1980
PRECIP 3.64 INS. IN 1969
SNOWFALL 17.5 INS. IN 1909
PEAK GUST 84 MPH SSE IN 1957

RECORDS FOR DECEMBER 27
HIGH 57 IN 1895,1949
LOW -4 IN 1903
PRECIP 2.43 INS. IN 1969
SNOWFALL 11.2 INS. IN 1947
PEAK GUST 73 S IN 2011

TODAY’S REPORT PREPARED BY: Matt Douglas