Monday, December 6, 2021

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

MONDAY, DECEMBER 6, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0659E
SUNSET:  1612E

ROLLER-COASTER RIDE CONTINUES, WINDY AND “WARM” TODAY ON THE HILL….

Another cold front is approaching the region and promises to push
through this evening. However before then, a strong push of warmer
air has overspread the area.

A warm front moved through early this morning accompanied by some
mainly light rain showers. Temperatures rose starkly from the mid
40s to the upper 50s. The dew point also took a jump into the 50s,
making it feel a tad sticky, especially compared to the dry air
of recent days.

The rain showers this morning only amounted to 0.10″ total, 0.08″
of which fell up to 7 A.M.

In addition to the warm air, windy conditions are also being
observed. The average speed for the day so far is around 19mph with
a peak gust of 41 mph so far. Frequent gusts between 35-40mph have
been occurring since mid to late morning here on the summit.

The high so far today is 58F, which is 15 degrees above the normal
max of 43F. The low since midnight is 37F, 9 degrees above the
normal low of 28F.

————————————————————–

PRELIMINARY STATS FOR NOVEMBER 2021

TEMPERATURE, Deg. F
Avg. Max. 50.8 [+0.7] Avg. Min. 33.6 [-0.2] Mean      42.2 [+0.2] 24-hour corrected mean: 41.6
Max. for month: 69F on the 18th
Min. for month: 21F on the 30th

HEATING DEGREE DAYS
Total heating units:    680 [-12] Total for the season:  1007 [-197] Total for last season: 1204

PRECIPITATION, Inches
Total: 1.92 [-2.39] Greatest in 24 hrs: 1.00 inch on the 12th

SNOWFALL, Inches
Total: 1.0 ins. [-0.8] Greatest in 24 hrs: 1.0 ins. from the 26th-27th

WIND, mph
Avg. uncorrected wind speed: 11.2 mph
Avg. corrected wind speed:   11.7 mph
Prevailing wind direction:   WNW [16%] Peak gust and direction:     72 SSE on the 12th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast stratus fractus, light rain showers
Temperature: 46F; Dew Point: 46F; Relative Humidity: 100%
Wind: SSE @ 13G22 kts, peak wind SSE 30 mph at 6:13 A.M.
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: falling, then more slowly
Visibility: 1.5 miles, fog
6-hr Max temp: 47F
6-hr Min temp: 37F
24-hr Precip:  0.08 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E1 OVC 11/2RW-F 164/46/46/1513G22/001/ STFRA DRFTG OVR SMT
PK WND 1526/13/ 8/7// 56047 6008/ 70008 10047 20037

10 A.M.
Weather: Sky obscured with vertical visibility 200ft
Temperature: 55F; Dew Point: 55F; Relative Humidity: 100%
Wind: S @ 17G27 kts, peak wind SSE 35 mph at 8:58 A.M.
Sea-level pressure: 1012.3 mb; 29.89 in Hg; falling, then more slowly
Visibility: 1/2 mile, fog
3-hr Precip: 0.02 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W2 1/2F 123/55/55/1817G27/989/ RW-B24E29 PK WND 1630/58/
8//// 56041 6002/

1 P.M.
Weather: Scattered stratus fractus, overcast stratocumulus, few breaks
in overcast all quadrants
Temperature: 58F, Dew point: 51F; Relative Humidity: 77%
Wind: SSW @ 20G32 kts, peak wind SSW 41 mph at 12:20 P.M.
Sea-level pressure: 1008.4 mb; 29.78 in Hg; falling unsteadily
Visibility: 20 miles
6-hr Max temp: 58F
6-hr Min temp: 46F
6-hr Precip: 0.02 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 20 SCT E27 OVC 20 084/58/51/2120G32/978/ FEW BINOVC ALQDS
PK WND 2036/20/ 8/7// 57039 6002/ 10058 20046

SUMMARY FOR SUNDAY, DECEMBER 5, 2021

TEMPERATURE (DEGREES F)
MAX…….45     NORMAL…..43
MIN…….32     NORMAL…..28
MEAN……39     NORMAL…..36

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………… +3
TOTAL DEPARTURE FOR THE MONTH……………………… +8 [+1.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………26  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH…………..135  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE SEASON…………1142  DEPARTURE……-206
TOTAL HEATING UNITS LAST SEASON TO DATE…….1084  DEPARTURE…… +58

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….25 SE  @ 10:59 P.M.
AEROVANE……………….25 SE  @ 10:59 P.M.
VECTOR #2 (Instantaneous)..26     @ 10:59 P.M.
DAVIS #2 ………………26 SSE @ 10:59 P.M.
RMY #2 (Instantaneous)…..25 SE  @ 10:59 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………………18 SE  @ 10:59 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18     @ 10:59 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 SE  @ 11:00 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 SE  @ 10:51 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……. 9.1 W   [219 total miles] VECTOR #2…………….. 9.9
DAVIS #2……………… 9.8 W
RMY #2……………….. 9.8 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…….0.08  DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH………….0.08  DEPARTURE…..-0.81
TOTAL PRECIPITATION FOR THE YEAR………….56.85  DEPARTURE…..+7.75

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0  DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH……………….0.0  DEPARTURE……-1.2
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……1.0  DEPARTURE……-2.7

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/01   59/41/50/+3/0.00/0.0/594/96      38 WNW AERO 39 WNW RMY 39
11/02   56/40/48/+1/0.00/0.0/247/40      25 SW  AERO 25 SW  RMY 26
11/03   51/35/43/-3/0.00/0.0/572/93      28 W   AERO 25 W   RMY 27
11/04   49/31/40/-6/0.00/0.0/446/73      17 NNE AERO 17 NNW RMY 16
11/05   49/32/41/-5/0.00/0.0/591/97      25 NW  AERO 24 NW  RMY 24
11/06   51/34/43/-2/0.00/0.0/595/98      18 SSW AERO 17 SW  RMY 19
11/07   55/37/46/+1/0.00/0.0/514/85      17 W   AERO 17 W   RMY 16
11/08   60/38/49/+4/0.00/0.0/578/96      20 N   AERO 18 N   RMY 19
11/09   69/45/57/+13/0.00/0.0/582/97     21 W   AERO 21 W   RMY 22
11/10   60/44/52/+8/0.00/0.0/389/65      36 NW  AERO 35 NW  RMY 35
11/11   56/40/48/+5/0.00/0.0/501/84      26 SE  AERO 28 SE  RMY 27
11/12   61/45/53/+10/1.00/0.0/000/00     72 SSE AERO 78 SSE RMY 76
11/13   60/36/48/+5/0.32/0.0/556/94      53 SW  AERO 53 SW  RMY 54
11/14   47/33/40/-2/0.03/0.0/336/57      29 W   AERO 28 W   RMY 28
11/15   48/36/42/0/0.07/0.0/405/69       35 W   AERO 36 W   RMY 38
11/16   46/31/39/-3/0.00/0.0/…/..      40 WNW AERO 41 WNW RMY 42
11/17   49/30/40/-1/0.00/0.0/…/..      34 S   AERO 36 S   RMY 34
11/18   69/49/59/+18/T/0.0/…/..        39 NW  AERO 36 WNW RMY 42
11/19   51/32/42/+1/0.29/0.0/…/..      42 W   AERO 41 W   RMY 41
11/20   45/27/36/-4/0.00/0.0/…/..      23 S   AERO 23 S   RMY 24
11/21   52/36/44/+4/T/0.0/…/..         35 S   AERO 35 S   RMY 36
11/22   55/33/44/+4/0.09/0.0/…/..      41 WSW AERO 41 WSW RMY 42
11/23   38/24/31/-8/0.00/0.0/…/..      36 NW  AERO 37 NW  RMY 37
11/24   41/22/32/-7/0.00/0.0/…/..      33 NW  AERO 32 NW  RMY 34
11/25   53/31/42/+3/0.00/0.0/…/..      21 WNW AERO 21 W   RMY 21
11/26   43/31/37/-1/0.11/0.9/…/..      39 WNW AERO 39 WNW RMY 41
11/27   37/24/31/-7/0.01/0.1/…/..      47 WNW AERO 45 WNW RMY 48
11/28   36/24/30/-8/T/T/…/..           22 W   AERO 21 W   RMY 23
11/29   39/25/32/-6/0.00/0.0/…/..      30 NW  AERO 28 NW  RMY 30
11/30   40/21/31/-6/0.00/0.0/…/..      27 WNW AERO 23 WSW RMY 26

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   The low since midnight is 37F, the daily normal low is 28F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR DECEMBER 6
HIGH 70 IN 2001
LOW 5 IN 1901,1935
PRECIP 2.78 INS. IN 2003
SNOWFALL 17.0 INS. IN 2003
PEAK GUST 74 MPH NW IN 1981

RECORDS FOR DECEMBER 7
HIGH 74 IN 1998
LOW 6 IN 1906
PRECIP 1.67 INS. IN 1953
SNOWFALL 6.3 INS. IN 2003
PEAK GUST 76e SE IN 1976

TODAY’S REPORT PREPARED BY: Matt Douglas