Friday, December 24, 2021

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

FRIDAY, DECEMBER 24, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0712E
SUNSET:  1616E

CHILLY WITH SOME VERY LIGHT SNOWFALL THIS CHRISTMAS EVE….

We observed light snow for most of the day today, only amounting
to a 1/10th inch by 1 P.M. Visibility reached 20 miles by noon,
starting from 6 miles this morning. Wind was either very light or
dead calm.

Ponkapoag and Houghton’s Pond are almost completely covered with
a thin layer of ice. Skating on them right now is definitely not
advisable given how mild this month has been.

The high so far today is 24F, which is 14 degrees below the normal
max of 38F. The low since midnight is 20F, which is 3 degrees below
the normal low of 23F.

Merry Christmas, and best wishes to you and yours!

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast nimbostratus with light snow
Temperature: 21F; Dew Point: 11F; Relative Humidity: 65%
Wind: S @ 2 kts, light and variable
Sea-level pressure: 1021.4 mb; 30.16 in. Hg: falling, then more rapidly
Visibility: 6 miles, snow
6-hr Max temp: 21F
6-hr Min temp: 20F
24-hr Precip:  Trace
24-hr Snowfall: Trace
Snow Depth: Trace
BHO SA 1155 70 OVC 6S- 214/21/11/1802/016/ NEW SNW PST 24 HRS TRACE WND
L/V/ 8/02/ 58008 6000/ 70000 10021 20020

10 A.M.
Weather: Overcast nimbostratus with very light snow
Temperature: 21F; Dew Point: 18F; Relative Humidity: 87%
Wind: WSW @ 2 kts, light and variable
Sea-level pressure: 1020.6 mb; 30.14 in Hg; rising steadily
Visibility: 10 miles, snow
3-hr Precip:  0.01 ins.
3-hr Snowfall: 0.1 ins.
BHO SA 1455 70 OVC 10S- 222/21/18/2402/019/ NEW SNW PST 3 HRS 0.1 INS.
PCPN VRY LGT WND L/V/ 8/02/ 52008 6001/

1 P.M.
Weather: Overcast nimbostratus with very light snow beginning at
12:30 P.M.
Temperature: 23F, Dew point: 16F; Relative Humidity: 73%
Wind: Calm
Sea-level pressure: 1020.9 mb; 30.15 in Hg; falling, then more slowly
Visibility: 20 miles
6-hr Max temp: 24F
6-hr Min temp: 20F
6-hr Precip:   0.01 ins.
6-hr Snowfall: 0.1 ins.
Snow Depth: Trace
BHO SA 1755 70 OVC 20S- 209/23/16/0000/015/ S-B30 NEW SNW PST 6 HRS 0.1 INS. PCPN
VRY LGT WND CALM/ 8/02/ 56013 6001/ 10024 20020

SUMMARY FOR THURSDAY, DECEMBER 23, 2021

TEMPERATURE (DEGREES F)
MAX…….30     NORMAL…..30
MIN…….21     NORMAL…..21
MEAN……26     NORMAL…..26

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………… -5
TOTAL DEPARTURE FOR THE MONTH………………………+94 [+3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………39  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH…………..627  DEPARTURE…….-95
TOTAL HEATING UNITS FOR THE SEASON…………1634  DEPARTURE……-292
TOTAL HEATING UNITS LAST SEASON TO DATE…….1695 DEPARTURE……..-61

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….39 NW  @  8:49 A.M.
AEROVANE……………….38 NW  @  8:50 A.M.
VECTOR #2 (Instantaneous)..43     @  8:49 A.M.
DAVIS #2 ………………34 NW  @  9:08 A.M.
RMY #2 (Instantaneous)…..40 NW  @  8:49 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………………23 NW  @  9:08 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25     @  9:43 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 NNW @  8:51 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 NW  @  9:43 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…..13.1 NW  [315 total miles] VECTOR #2……………13.7
DAVIS #2…………….13.6 WNW
RMY #2………………13.5 NW
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……TRACE  DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH………….2.05  DEPARTURE…..-2.04
TOTAL PRECIPITATION FOR THE YEAR………….58.82  DEPARTURE…..+6.52

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..TRACE  DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH……………….1.4  DEPARTURE……-7.1
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.4  DEPARTURE……-8.6

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 The low since midnight is 20F, the daily normal low is 23F

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 24
HIGH 67 IN 2015
LOW -6 IN 1943
PRECIP 2.21 INS. IN 1994
SNOWFALL 12.3 INS. IN 1961
PEAK GUST 79e MPH SE IN 1941

RECORDS FOR DECEMBER 25
HIGH 64 IN 2015
LOW -11 IN 1980
PRECIP 2.15 INS. IN 2020
SNOWFALL 8.5 INS. IN 2002
PEAK GUST 80 MPH NW IN 1971

TODAY’S REPORT PREPARED BY: Benjamin Turner