BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, DECEMBER 24, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME INCREASING WIND AND CLOUDS AS PRESSURE DROPS.... Today we observed a limited visibility between 1 and 40 miles. This was due to fog in the morning and haze later on. Pressure is falling steadily as winds begin to strengthen. There is a constant speed of 20 mph with the highest gusting being almost 40 mph from the southeast. The high so far today is 53F, 16 degrees above the daily normal maximum of 37F. The low since midnight is 30F, 9 degrees above the normal minimum of 21F. Today's Observations: 7 A.M. Weather: Scattered altocumulus Temperature: 38F; Dew Point: 38F; Relative Humidity: 100% Wind: SE @ 13 kts Sea-level pressure: 30.29 in Hg; falling steadily Visibility: 1 mile, fog 6-hr Max temp: 39F 6-hr Min temp: 32F 24-hr Precip: 0.00 ins. 24-hr Snow: 0.0 ins. Snow Depth: 7 ins. BHO SA 1155 180 SCT 1F 259/38/38/1513/029/ 8/070 4/007 56014 10039 20032 10 A.M. Weather: Scattered cumulus, broken altocumulus and cirrostratus Temperature: 49F; Dew Point: 42F; Relative Humidity: 75% Wind: SSE @ 15G23 kts Sea-level pressure: 30.28 in Hg; falling steadily Visibility: 40 miles, hazy 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 50 SCT 180 BKN 250 BKN 40 262/49/42/1615G23/028/ HAZY/ 8/878 56003 1 P.M. Weather: Scattered stratocumulus, broken altocumulus Temperature: 52F; Dew Point: 45F; Relative Humidity: 75% Wind: S @ 19G30 kts, peak of 39 mph S at 12:12 P.M. Sea-level pressure: 29.19 in Hg; falling, then more rapidly Visibility: 25 miles, hazy 6-hr Max temp: 53F 6-hr Min temp: 38F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 5 ins. BHO SA 1755 50 SCT 180 BKN 25 229/52/45/1719G30/019/ HAZY PK WND 1734/12/ 8/870 4/005 56033 10053 20038 SUMMARY FOR WEDNESDAY, DECEMBER 23, 2020 TEMPERATURE (DEGREES F) MAX.......37   NORMAL.....37 MIN.......26   NORMAL.....21 MEAN......32   NORMAL.....29 DEPARTURE FROM 30-YEAR NORMAL.....................+3 TOTAL DEPARTURE FOR THE MONTH.....................+21 [+0.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............33  DEPARTURE.......-3 TOTAL HEATING UNITS FOR THE MONTH..............722  DEPARTURE......-23 TOTAL HEATING UNITS FOR THE SEASON............1695  DEPARTURE.....-312 TOTAL HEATING UNITS LAST SEASON TO DATE.......2018  DEPARTURE.....-323 PEAK WIND GUST FOR YESTERDAY (MPH):                      420C/Official..............30 WNW @ 12:19 A.M.                      AEROVANE (south tower).....28 WNW @ 12:20 A.M.                      ASOS.......................29 WNW @ 12:12 A.M.                      DAVIS #1...................32 WNW @ 12:20 A.M.                      DAVIS #2 (south tower).....30 SSE @ 10:47 P.M.                      RMY........................31                            VECTOR.....................34                          MERLIN.....................N/A FASTEST MILE FOR YESTERDAY: CONTACTING/OFFICIAL.............................20 S   @ 11:03 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................20 S   @ 11:01 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............21 NW  @ 12:21 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............24 SSE @  9:56 P.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL...10.5 WNW [251 total miles]                      ASOS..................11.0     [264 total miles]                      DAVIS #1..............11.2 W   [268 total miles]                      DAVIS #2..............11.9 W   [277 total miles]                      RMY...................10.4 W   [250 total miles]                      VECTOR................11.1     [258 total miles] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.16                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............5.03  DEPARTURE....+1.32                              ASOS.............5.53 TOTAL PRECIPITATION FOR THE YEAR.............51.43  DEPARTURE....-0.81                               ASOS...........52.86 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........0.0  DEPARTURE.....-0.5 TOTAL SNOWFALL FOR THE MONTH..................19.7  DEPARTURE....+10.5 TOTAL SNOWFALL FOR THE SEASON.................26.2  DEPARTURE....+14.4 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   34/19/27/-7/T/T/.../..            16 W    AERO 17 W    RMY 19 12/10   42/30/36/+3/0.00/0.0/.../..       30 WNW  AERO 31 WNW  RMY 29 12/11   50/31/41/+8/0.00/0.0/.../..       32 SW   AERO 35 SW   RMY 34 12/12   48/40/44/+11/0.38/0.0/.../..      25 E    AERO 21 E    RMY 25 12/13   58/35/47/+15/0.00/0.0.../..       28 W    AERO 31 WSW  RMY 31 12/14   35/30/33/+1/0.10/0.4/.../..       25 N    AERO 25 N    RMY 29 12/15   34/21/28/-4/0.00/0.0/.../..       32 WNW  AERO 33 WNW  RMY 38 12/16   27/13/20/-11/..../1.4/.../..      38 E    AERO 37 E    RMY 39 12/17   31/19/25/-6/..../15.1/.../..      55 ENE  AERO 56 ENE  RMY 59 12/18   27/18/23/-8/0.00/0.0/.../..       28 N    AERO 26 N    RMY 27 12/19   29/13/21/-9/0.00/0.0/.../..       16 SW   AERO 16 S    RMY 16 12/20   36/24/30/0/0.02/T/.../..          14 S    AERO 16 SW   RMY 14 12/21   34/29/32/+2/0.00/0.0/.../..       22 WNW  AERO 24 WNW  RMY 23 12/22   42/30/36/+7/0.00/0.0/.../...      34 WNW  AERO 35 WNW  RMY 38 12/23   37/26/32/+3/0.00/0.0/.../..       30 WNW  AERO 28 WNW  RMY 31 12/24   The low since midnight is 30F, the daily normal low is 21F DAILY RECORDS FOR DECEMBER 2020 12/17/20: DAILY RECORD SNOWFALL OF 15.1 INCHES,           BREAKS PREVIOUS RECORD OF 7.5 INCHES SET IN 1988 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 24 HIGH 67 IN 2015 LOW -6 IN 1943 PRECIP 2.21 INS. IN 1994 SNOWFALL 12.3 INS. IN 1961 PEAK GUST 79e MPH SE IN 1941 RECORDS FOR DECEMBER 25 HIGH 64 IN 2015 LOW -11 IN 1980 PRECIP 1.37 INS. IN 2002 SNOWFALL 8.5 INS. IN 2002 PEAK GUST 80 MPH NW IN 1971 TODAY'S REPORT PREPARED BY: Benjamin Turner