BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, DECEMBER 9, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME OVERCAST WITH LIGHT WINDS AND LIMITED AFTERNOON VISIBILITY.... Today we observed mostly cloudy skies with a max visibility around 65 miles at the 10 A.M. observation. This decreased since then, being only 30 miles at 1 P.M. due to haze. Wind was light and southwesterly since this morning, only reaching 16 mph as of yet. Pressure is on a steady decline as the cloud cover has become more dense as the day goes on.   The high so far today is 32F, 9 degrees below the daily normal high of 41F. The low since midnight is 19F, 7 degrees below the normal low of 26F.   PRELIMINARY STATS FOR NOVEMBER 2020 TEMPERATURE, Deg. F Avg. Max. 56.3 [+6.3] Avg. Min. 38.6 [+5.1] Mean      47.5 [+5.8] 24-hour corrected mean: 46.9 Max. for month: 75F on the 7th Min. for month: 18F on the 19th HEATING DEGREE DAYS Total heating units:   521 [-177] Total for the season:  973 [-288] Total for last season: 1237 PRECIPITATION, Inches Total: 5.23 [+1.77] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: TRACE Greatest in 24 hrs: T on the 2nd WIND, mph Avg. uncorrected wind speed: 12.9 mph Avg. corrected wind speed:   13.2 mph Prevailing wind direction:   SSW [14%] Peak gust and direction:     81 SSE on the 30th SUNSHINE: Campbell-Stokes card minutes: 9066 minutes of a possible 17010 or 53% Astronomical total minutes: 9382 minutes of a possible 17593 or 53% Today's Observations: 7 A.M. Weather: Broken altocumulus and cirrostratus, few stratocumulus Temperature: 21F; Dew Point: 18F; Relative Humidity: 87% Wind: W at 10 kts   Sea-level pressure: 29.80 in Hg; falling then rising Visibility: 60 miles 6-hr Max temp: 22F 6-hr Min temp: 19F 24-hr Precip: Trace. 24-hr Snow: Trace. Snow Depth: 1 ins. BHO SA 1155 140 BKN 220 BKN 60 091/21/18/2810/980/ FEW SC THN K LYR ALQDS/ 8/856 4/001 50010 10022 20019 10 A.M. Weather: Broken altocumulus and cirrostratus, few stratocumulus Temperature: 25F; Dew Point: 19F; Relative Humidity: 77% Wind: W at 7 kts   Sea-level pressure: 29.78 in Hg; falling steadily Visibility: 65 miles, thin smoke layer 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 140 BKN 220 BKN 65 086/25/19/2807/978/ FEW SC THN K LYR ALQDS/ 8/856 58005 1 P.M. Weather: Broken altocumulus Temperature: 32F; Dew Point: 24F; Relative Humidity: 72% Wind: SSW at 8 kts Sea-level pressure: 29.72 in Hg; rising, then falling Visibility: 30 miles, hazy 6-hr Max temp: 32F 6-hr Min temp: 21F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth:  1 ins. BHO SA 1755 140 BKN 30 068/32/24/2208/972/ HAZY/ 8/070 4/001 56018 10032 20021 SUMMARY FOR TUESDAY, DECEMBER 8, 2020 TEMPERATURE (DEGREES F) MAX.......29   NORMAL.....42 MIN.......22   NORMAL.....26 MEAN......26   NORMAL.....34 DEPARTURE FROM 30-YEAR NORMAL...................  -8 TOTAL DEPARTURE FOR THE MONTH................... +16 [+1.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............39  DEPARTURE.......+8 TOTAL HEATING UNITS FOR THE MONTH..............222  DEPARTURE......-16 TOTAL HEATING UNITS FOR THE SEASON............1195  DEPARTURE.....-305 TOTAL HEATING UNITS LAST SEASON TO DATE.......1534  DEPARTURE.....-339 PEAK WIND GUST FOR YESTERDAY (MPH):                      420C/Official..............24 NW   AT  7:14 P.M.                      AEROVANE (south tower).....25 NW   AT  3:59 P.M.                      ASOS.......................25 NNW  AT  7:02 A.M.                      DAVIS #1...................26 NNE  AT  6:39 A.M.                      DAVIS #2 (south tower).....27 N    AT  6:24 A.M.                      RMY........................28                            VECTOR.....................30                          MERLIN.....................25 FASTEST MILE FOR YESTERDAY: CONTACTING/OFFICIAL.............................18 NW   AT   3:42 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................17 NW   AT   3:53 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............19 NW   AT   3:52 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............19 N    AT   6:24 A.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL......11.5 NW   [276 total miles]                      ASOS.....................11.1      [266 total miles]                      DAVIS #1.................11.9 NW   [286 total miles]                      DAVIS #2.................11.8 NW   [283 total miles]                      RMY......................11.1 NNW  [265 total miles]                      VECTOR...................11.7      [272 total miles] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M......TRACE  DEPARTURE....-0.17                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............2.81  DEPARTURE....+1.49                              ASOS.............2.89 TOTAL PRECIPITATION FOR THE YEAR.............47.38  DEPARTURE....-0.64                               ASOS...........48.33 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HOURS ENDING 7 A.M.........TRACE  DEPARTURE.....-0.3 TOTAL SNOWFALL FOR THE MONTH...................2.8  DEPARTURE.....+0.4 TOTAL SNOWFALL FOR THE SEASON..................9.3  DEPARTURE.....+4.3 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/+23/0.04/0.0/137/23     40 SW    AERO 44 SW   RMY 45 11/12   64/46/55/+12/0.04/0.0/000/00     32 NNW   AERO 31 NNW  RMY 33 11/13   48/38/43/0/0.30/0.0/000/00       22 NW    AERO 21 NW   RMY 25 11/14   49/32/41/-1/0.00/0.0/276/47      26 NW    AERO 28 NW   RMY 29 11/15   58/30/44/+2/0.62/0.0/311/53      60 S     AERO 67 S    RMY 65 11/16   53/39/46/+4/0.00/0.0/526/90      40 WNW   AERO 41 WNW  RMY 43 11/17   47/32/40/-1/0.00/0.0/204/35      28 NW    AERO 28 NW   RMY 30 11/18   32/19/26/-15/0.00/0.0/580/100    40 NW    AERO 46 NW   RMY 43 11/19   44/18/31/-10/0.00/0.0/393/68     37 SW    AERO 39 SW   RMY 43     11/20   63/44/54/+14/0.00/0.0/495/86     33 SSW   AERO 35 SSW  RMY 37 11/21   62/40/51/+11/0.00/0.0/339/59     24 W     AERO 23 W    RMY 27 11/22   45/33/39/-1/T/0.0/006/01         28 SE    AERO 28 SE   RMY 31 11/23   58/32/45/+6/1.77/0.0/000/00      42 WNW   AERO 48 WNW  RMY 46 TSTM 11/24   42/27/35/-4/0.00/0.0/569/100     31 WNW   AERO 32 WNW  RMY 33 11/25   50/26/38/-1/0.01/0.0/017/03      23 SSE   AERO 23 SSE  RMY 26 11/26   58/45/52/+14/0.36/0.0/000/00     36 S     AERO 37 S    RMY 41 11/27   53/46/50/+12/0.00/0.0/056/10     23 WNW   AERO 23 WNW  RMY 23 11/28   52/36/44/+6/T/0.0/180/32         28 WNW   AERO 30 WNW  RMY 27 11/29   52/33/43/+6/0.00/0.0/561/100     21 SSW   AERO 21 SSW  RMY 22 11/30   62/40/51/+14/1.35/0.0/000/00     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/+14/0.61/0.0/.../..      60 S    AERO 67 W    RMY 64 12/02   42/32/37/+1/0.00/0.0/.../..       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   58/40/49/+14/0.06/0.0/.../..      35 SSW  AERO 35 SSW  RMY 37 12/05   42/32/37/+2/2.13/2.8/.../..       58 NNW  AERO 58 NNW  RMY 67 12/06   34/26/30/-5/0.01/T/.../..        E44 WNW  AERO 44 WNW  RMY 49 12/07   33/22/28/-6/T/T/.../..            24 NW   AERO 26 NW   RMY 26 12/08   29/22/26/-8/T/T/.../..            24 NW   AERO 25 NW   RMY 28 12/09 The low since midnight is 24F, the daily normal low is 26F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 9 HIGH 68 IN 1966 LOW -14 IN 1902 PRECIP 3.23 INS. IN 2014 SNOWFALL 10.8 INS. IN 2005 PEAK GUST 66 SE IN 1973 RECORDS FOR DECEMBER 10 HIGH 62 IN 1946 LOW -6 IN 1902 PRECIP 1.67 INS. IN 1907 SNOWFALL 6.0 INS. IN 1905 PEAK GUST 66e SW IN 1940 TODAY'S REPORT PREPARED BY: Benjamin Turner