Friday, December 4, 2020

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

FRIDAY, DECEMBER 4, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM AND STILL WINDY WITH CLEARER SKIES IN THE
AFTERNOON….

Today we observed a good visibility of 70 miles under
partly cloudy skies in the afternoon hours. There was
a layer of haze that kept visibility down to 35 miles
this morning. Wind was significant today, reaching 30 mph.
We are seeing wind from the southwest, with an average
speed of 15 mph.

Pressure started to fall rather quickly since 10 A.M., by
almost 4 millibars!

The high so far today is 57F, 14 degrees above the daily
normal high of 43F. The low since midnight is 40F, 12 degrees
above the normal low of 28F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus and cirrostratus
Temperature: 43F; Dew Point: 29F; Relative Humidity: 56%
Wind: SSW at 15G22 kts, peak of 30 mph at 5:54 A.M.
Sea-level pressure: 30.05 in Hg; rising steadily
Visibility: 35 miles, hazy
6-hr Max temp: 43F
6-hr Min temp: 40F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 110 BKN 220 BKN 35 175/43/29/2015G22/005/ HAZY
PK WND 1926/1054/ 8/076 55002 10043 20040

10 A.M.
Weather: Broken altocumulus and cirrostratus
Temperature: 49F; Dew Point: 33F; Relative Humidity: 58%
Wind: SW at 12G19 kts
Sea-level pressure: 30.07 in Hg; steady, then rising
Visibility: 65 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 110 BKN 220 BKN 65 181/49/33/2212G19/007/ 8/076
51006

1 P.M.
Weather: Scattered altocumulus and cirrostratus
Temperature: 56F; Dew Point: 30F; Relative Humidity: 36%
Wind: SW at 13G20 kts
Sea-level pressure: 29.98 in Hg; falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 43F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 110 SCT 220 SCT 70 149/56/30/2113G20/998/ 8/078
58032 10057 20043

SUMMARY FOR THURSDAY, DECEMBER 3, 2020

TEMPERATURE (DEGREES F)
MAX…….57   NORMAL…..44
MIN…….30   NORMAL…..28
MEAN……40   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL………………. +4
TOTAL DEPARTURE FOR THE MONTH………………. +19 [+6.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………25  DEPARTURE…….-4
TOTAL HEATING UNITS FOR THE MONTH……………67  DEPARTURE……-20
TOTAL HEATING UNITS FOR THE SEASON…………1040  DEPARTURE…..-308
TOTAL HEATING UNITS LAST SEASON TO DATE…….1350  DEPARTURE…..-310

PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..25 SSW  AT  9:47 P.M.
AEROVANE (south tower)…..25 SSW  AT  9:43 P.M.
ASOS…………………..26 SSW  AT  9:48 P.M.
DAVIS #1……………….25 WSW  AT  9:47 P.M.
DAVIS #2 (south tower)…..27 SW   AT  9:47 P.M.
RMY……………………28
VECTOR…………………30
MERLIN…………………N/A

FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..20 SSW  AT   9:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 SSW  AT   9:02 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 SW   AT   9:02 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 SW   AT   9:02 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.1 SW   [291 total miles] ASOS…………………12.8      [307 total miles] DAVIS #1……………..12.4 SW   [298 total miles] DAVIS #2……………..13.0 SW   [312 total miles] RMY………………….12.1      [290 total miles] VECTOR……………….14.6      [296 total miles]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.17
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.61  DEPARTURE….+0.12
ASOS………….0.65
TOTAL PRECIPITATION FOR THE YEAR………….47.01  DEPARTURE….-2.01
ASOS………..47.98

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE…..-0.3
TOTAL SNOWFALL FOR THE MONTH……………….0.0  DEPARTURE…..-0.8
TOTAL SNOWFALL FOR THE SEASON………………6.5  DEPARTURE…..+3.1

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   49/36/43/-3/0.69/0.0/006/01      38 W     AERO 40 W    RMY 39
11/02   40/31/36/-10/T/T/425/69          61 WNW   AERO 62 WNW  RMY 62
11/03   43/29/36/-10/0.00/0.0/473/77     48 WNW   AERO 53 WNW  RMY 48
11/04   54/30/42/-3/0.00/0.0/550/90      30 SSW   AERO 30 SSW  RMY 30
11/05   69/49/59/+14/0.00/0.0/548/90     37 SSW   AERO 40 SSW  RMY 38
11/06   72/55/64/+19/0.00/0.0/394/65     28 SW    AERO 28 SW   RMY M
11/07   75/54/65/+20/0.00/0.0/562/93     21 WSW   AERO 21 WSW  RMY 21
11/08   73/54/64/+20/0.00/0.0/584/97     18 W     AERO 18 W    RMY 19
11/09   74/52/63/+19/0.00/0.0/593/99     20 WSW   AERO 18 WSW  RMY 21
11/10   74/53/64/+20/0.00/0.0/597/100    30 SW    AERO 28 SW   RMY 31
11/11   73/58/66/+23/0.04/0.0/…/..     40 SW    AERO 44 SW   RMY 45
11/12   64/46/55/+12/0.04/0.0/…/..     32 NNW   AERO 31 NNW  RMY 33
11/13   48/38/43/0/0.30/0.0/…/..       22 NW    AERO 21 NW   RMY 25
11/14   49/32/41/-1/0.00/0.0/…/..      26 NW    AERO 28 NW   RMY 29
11/15   58/30/44/+2/0.62/0.0/…/..      60 S     AERO 67 S    RMY 65
11/16   53/39/46/+4/0.00/0.0/…/..      40 WNW   AERO 41 WNW  RMY 43
11/17   47/32/40/-1/0.00/0.0/…/..      28 NW    AERO 28 NW   RMY 30
11/18   32/19/26/-15/0.00/0.0/…/..     40 NW    AERO 46 NW   RMY 43
11/19   44/18/31/-10/0.00/0.0/…/..     37 SW    AERO 39 SW   RMY 43
11/20   63/44/54/+14/0.00/0.0/…/..     33 SSW   AERO 35 SSW  RMY 37
11/21   62/40/51/+11/0.00/0.0/…/..     24 W     AERO 23 W    RMY 27
11/22   45/33/39/-1/T/0.0/…/..         28 SE    AERO 28 SE   RMY 31
11/23   58/32/45/+6/1.77/0.0/…/..      42 WNW   AERO 48 WNW  RMY 46 TSTM
11/24   42/27/35/-4/0.00/0.0/…/..      31 WNW   AERO 32 WNW  RMY 33
11/25   50/26/38/-1/0.01/0.0/…/..      23 SSE   AERO 23 SSE  RMY 26
11/26   58/45/52/+14/0.36/0.0/…/..     36 S     AERO 37 S    RMY 41
11/27   53/46/50/+12/0.00/0.0/…/..     23 WNW   AERO 23 WNW  RMY 23
11/28   52/36/44/+6/T/0.0/…/..         28 WNW   AERO 30 WNW  RMY 27
11/29   52/33/43/+6/0.00/0.0/…/..      21 SSW   AERO 21 SSW  RMY 22
11/30   62/40/51/+14/1.35/0.0/…/..     81 SSE   AERO 82 SSE  RMY 86

DAILY RECORDS FOR NOVEMBER 2020

11/06/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 72F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1959 AND 2015

11/07/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 75F,
TIES PREVIOUS RECORD OF 75F SET IN 1938

11/08/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1938

11/09/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1975

11/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 58F,
BREAKS PREVIOUS RECORD OF 56F IN 2002
DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 68F IN 1984

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   62/40/51/+14/…./0.0/…/..      60 S    AERO 67 W    RMY 64
12/02   42/32/37/+1/…./…/…/..       32 SW   AERO 32 SW   RMY 35
12/03   49/30/40/+4/0.00/0.0/…/..       25 SSW  AERO 25 SSW  RMY 28

12/04 The low since midnight is 39F, 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 4
HIGH 67 IN 1998
LOW -4 IN 1940
PRECIP 1.87 INS. IN 1968
SNOWFALL 6.0 INS. IN 1907
PEAK GUST 73 MPH WNW IN 1980

RECORDS FOR DECEMBER 5
HIGH 65 IN 2001
LOW -1 IN 1926
PRECIP 2.86 INS. IN 1993
SNOWFALL 7.0 INS. IN 1926, 1981
PEAK GUST 67 MPH WNW IN 1961, S IN 1973

TODAY’S REPORT PREPARED BY: Benjamin Turner