Wednesday, December 29, 2021

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

WEDNESDAY, DECEMBER 29, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0713E
SUNSET:  1620E

A LITTLE BIT OF SNOW LAST NIGHT AND THIS MORNING IS AN
ACTUAL DROP IN THE BUCKET….

Light snow overnight amounted to 0.03 inches with only 0.1
inches of snowfall, leaving us with a monthly deficit of
-2.36 inches for rain and -9.3 inches for snow. Some more
snow fell this morning, leaving a trace of snow and 0.01 inches
for rain. Quite a dry December!

Skies are overcast for the most part, and visibility is 30 miles
at most after noontime. Fog had visibility to 3 miles earlier on.

The high so far today is 40F, which is 3 degrees above the normal
max of 37F. The low since midnight is 32F, which is 11 degrees above
the normal low of 21F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Very light snow beginning five minutes before the hour,
Broken nimbostratus, overcast cirrus with breaks NE-E-S
Temperature: 32F; Dew Point: 32F; Relative Humidity: 100%
Wind: NW @ 2 kts, wind light and variable
Sea-level pressure: 1011.8 mb; 28.88 in. Hg: rising then falling
Visibility: 3 miles, fog
6-hr Max temp: 33F
6-hr Min temp: 32F
24-hr Precip:  0.03 ins.
24-hr Snowfall: 0.1 ins.
Snow Depth: Trace
BHO SA 1155 70 BKN 250 OVC 3S-F 118/32/32/3402/988/ BINOVC NE-E-S S-B55
PCPN VRY LGT NEW SNW PST 24 HRS 0.1 INS. WND L/V/ 8/071 70003 55000 10033
20032

10 A.M.
Weather: Scattered stratus fractus, Overcast altostratus
Temperature: 36F; Dew Point: 34F; Relative Humidity: 92%
Wind: N @ 3 kts, wind light and variable
Sea-level pressure: 1013.8 mb; 29.94 in Hg; rising, then more slowly
Visibility: 20 miles, thin fog
3-hr Precip:  0.01 ins.
3-hr Snowfall: Trace
BHO SA 1455 40 SCT 70 OVC 20 138/36/34/3603/994/ THN F ALQDS NEW SNW
PST 3 HRS TRACE WND L/V/ 8/62/ 51020 6001/

1 P.M.
Weather: Overcast stratus
Temperature: 38F, Dew point: 30F; Relative Humidity: 72%
Wind: ENE @ 3 kts, wind light and variable
Sea-level pressure: 1012.7 mb; 29.91 in Hg; falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 40F
6-hr Min temp: 32F
6-hr Precip:   0.01 ins.
6-hr Snowfall: Trace
Snow Depth: 0 ins.
BHO SA 1755 30 OVC 30 127/38/30/0703/991/ HAZY NEW SNW PST 6 HRS TRACE
WND L/V/ 8/6// 58011 6001/ 10040 20032

SUMMARY FOR TUESDAY, DECEMBER 28, 2021

TEMPERATURE (DEGREES F)
MAX…….42     NORMAL…..37
MIN…….30     NORMAL…..22
MEAN……36     NORMAL…..29

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+7
TOTAL DEPARTURE FOR THE MONTH………………………+98 [+3.3 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…………..799  DEPARTURE…….-99
TOTAL HEATING UNITS FOR THE SEASON…………1806  DEPARTURE……-296
TOTAL HEATING UNITS LAST SEASON TO DATE…….1830 DEPARTURE……..-24

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….34 NW  @  1:57 P.M.
AEROVANE……………….32 NW  @  1:57 P.M.
VECTOR #2 (Instantaneous)..35     @  1:57 P.M.
DAVIS #2 ………………32 NW  @  1:57 P.M.
RMY #2 (Instantaneous)…..35 NW  @  1:57 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………………24 NW  @  1:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26     @  1:58 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 NW  @  1:58 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 NW  @  1:58 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……9.5 WNW  [228 total miles] VECTOR #2……………10.2
DAVIS #2…………….10.2 WSW
RMY #2………………10.2 WSW
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…….0.03  DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH………….2.55  DEPARTURE…..-2.36
TOTAL PRECIPITATION FOR THE YEAR………….59.32  DEPARTURE…..+6.16

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.1  DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH……………….1.7  DEPARTURE……-9.3
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.7  DEPARTURE…..-10.8

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 The low since midnight is 32F, 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 29
HIGH 72 IN 1984
LOW -19 IN 1933 (RECORD FOR DECEMBER)
PRECIP 1.89 INS. IN 1945
SNOWFALL 18.4 INS. IN 1945
PEAK GUST 95 MPH S IN 1966 (RECORD FOR DECEMBER)

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

TODAY’S REPORT PREPARED BY: Benjamin Turner