Wednesday, December 15, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, DECEMBER 15, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0707E
SUNSET: 1611E
MOSTLY CLOUDY WITH EXCELLENT VISIBILITY AND CHANGEABLE WIND….
Today we observed mostly cloudy skies with an average visibility of
80 miles. The maximum visibility was 85 miles at the 10 A.M. observation
despite a distant smoke layer. The ponds were 2/10ths frozen this morning,
but melted again over the course of the day.
Wind was very variable as it shifted from north to east, and then south
within the course of 6 hours. The highest gust was negligible, and the
average wind speed was 5 mph at best.
The high so far today is 42F, which is 2 degrees above the normal
max of 40F. The low since midnight is 28F, which 3 degrees above
the normal low of 25F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken cirrocumulus
Temperature: 30F; Dew Point: 11F; Relative Humidity: 45%
Wind: N @ 7 kts
Sea-level pressure: 1039.3 mb; 30.69 in. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 33F
6-hr Min temp: 28F
24-hr Precip: 0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 150 SCT 250 BKN 70 393/30/11/3607/069/ 8/059 53007 10033
20028
10 A.M.
Weather: Scattered altocumulus, overcast cirrocumulus with
breaks
Temperature: 36F; Dew Point: 17F; Relative Humidity: 46%
Wind: E @ 2 kts, light and variable
Sea-level pressure: 1039.1 mb; 30.68 in Hg; rising then falling
Visibility: 85 miles, thin smoke layer, surprisingly
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 150 SCT 250 OVC 85 390/36/17/0902/068/ BINOVC THN K LYR
ALQDS WND L/V/ 8/059 55003
1 P.M.
Weather: Broken altocumulus and overcast cirrostratus with
breaks NE-S, sun dimly visible
Temperature: 41F, Dew point: 26F; Relative Humidity: 55%
Wind: S @ 7 kts
Sea-level pressure: 1035.7 mb; 30.58 in Hg; falling, then more
slowly
Visibility: 80 miles
6-hr Max temp: 42F
6-hr Min temp: 28F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1755 150 BKN 250 OVC 80 357/41/26/1807/058/ BINOVC NE-E-S
SUN DMLY VSBL/ 8/056 56033 10042 20028
SUMMARY FOR TUESDAY, DECEMBER 14, 2021
TEMPERATURE (DEGREES F)
MAX…….50 NORMAL…..41
MIN…….33 NORMAL…..25
MEAN……42 NORMAL…..33
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+9
TOTAL DEPARTURE FOR THE MONTH………………………+59 [+4.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………23 DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..362 DEPARTURE…….-60
TOTAL HEATING UNITS FOR THE SEASON…………1369 DEPARTURE……-257
TOTAL HEATING UNITS LAST SEASON TO DATE…….1357 DEPARTURE…… +12
PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….31 WSW @ 1:37 A.M.
AEROVANE……………….30 WSW @ 1:18 A.M.
VECTOR #2 (Instantaneous)..32 @ 1:37 A.M.
DAVIS #2 ………………30 W @ 1:38 A.M.
RMY #2 (Instantaneous)…..32 WSW @ 1:37 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………………21 WSW @ 1:18 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 @ 1:18 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 W @ 1:18 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 WSW @ 1:18 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……11.8 NNW [283 total miles]
VECTOR #2…………….12.2
DAVIS #2……………..12.2 NW
RMY #2……………….12.1 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…….0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH………….0.83 DEPARTURE…..-1.68
TOTAL PRECIPITATION FOR THE YEAR………….57.60 DEPARTURE…..+6.88
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0 DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH……………….1.2 DEPARTURE……-3.3
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……2.2 DEPARTURE……-4.8
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/…/.. 35 W AERO 35 W RMY 34
12/02 58/35/47/10/T/0.0/…/.. 56 WNW AERO 59 WNW RMY 62 TSTM
12/03 41/28/35/-1/0.00/0.0/…/.. 46 NW AERO 44 NW RMY 46
12/04 39/25/32/-4/0.00/0.0/…/.. 25 SW AERO 23 SW RMY 26
12/05 45/32/39/+3/0.00/0.0/…/.. 25 SE AERO 25 SE RMY 25
12/06 59/37/48/+13/0.34/0.0/…/.. 59 WNW AERO 59 NW RMY 60
12/07 40/29/35/0/T/0.0/…/… 47 WNW AERO 36 WNW RMY 48
12/08 34/25/30/-5/0.05/0.6/…/.. 26 NNE AERO 25 NE RMY 26
12/09 35/20/28/-6/0.05/0.6/…/.. 32 NW AERO 30 NW RMY 33
12/10 43/27/35/+1/0.00/0.0/…/.. 21 SE AERO 20 SE RMY 21
12/11 62/37/50/+16/0.34/0.0/…/.. 57 SSW AERO 59 SSW RMY 58
12/12 58/36/47/+13/0.05/0.0/…/.. 55 WNW AERO 55 WNW RMY 58
12/13 50/35/43/+10/0.00/0.0/…/.. 32 WSW AERO 33 WSW RMY 33
12/14 50/33/42/+9/0.00/0.0/…/.. 31 WSW AERO 30 WSW RMY 32
12/15 The low since midnight is 28F, the daily normal low is 25F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR DECEMBER 15
HIGH 64 IN 1975
LOW 4 IN 1900, 1905, 1933
PRECIP 1.80 INS. IN 1981
SNOW 7.5 INS. IN 1951
PEAK GUST 65 MPH NW IN 1991
RECORDS FOR DECEMBER 16
HIGH 61 IN 1971
LOW -2 IN 1930
PRECIP 1.67 INS. IN 1960
SNOW 8.5 INS. IN 2007
WIND 73 MPH SSE IN 1982
TODAY’S REPORT PREPARED BY: Benjamin Turner
