BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, JANUARY 7, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME A SIMILAR DAY TO YESTERDAY, BUT WITH GOOD VISIBILITY AT THE START.... Today we observed partly cloudy skies, with a good average visibility of 70 miles. The highest visibility was 75 miles at 10 A.M. Conditions are on the drier side, with dew points in the upper teens and a humidity of 44% at the 1 P.M. observation. Wind is consistent at a little over 10 mph, with frequent gusts around 20 mph from the northwest.   The high so far today is 39F, 5 degrees above the daily normal maximum of 34F. The low since midnight is 28F, 10 degrees above the normal minimum of 18F. PRELIMINARY STATS FOR DECEMBER 2020 TEMPERATURE, Deg. F Avg. Max. 41.1 [+2.0] Avg. Min. 27.2 [+3.6] Mean      34.2 [+2.9] 24-hour corrected mean: 34.0 Max. for month: 62F on the 1st Min. for month: 13F on the 16th and 19th HEATING DEGREE DAYS Total heating units:   957 [-86] Total for the season:  1930 [-375] Total for last season: 2251 PRECIPITATION, Inches Total: 7.32 [+2.43] Greatest in 24 hrs: 2.15 ins. on the 25th SNOWFALL, Inches Total: 19.7 [+6.3] Greatest in 24 hrs: 16.5 ins. on the 16th-17th WIND, mph Avg. uncorrected wind speed: 13.0 mph Avg. corrected wind speed:   13.3 mph Prevailing wind direction:   WNW [17%] Peak gust and direction:     68 SSE on the 25th SUNSHINE: Campbell-Stokes card minutes: N/A Astronomical total minutes: N/A Today's Observations: 7 A.M. Weather: Scattered altocumulus and cirrostratus Temperature: 29F; Dew Point: 17F; Relative Humidity: 61% Wind: NW at 10G19 kts Sea-level pressure: 29.97 in Hg; rising steadily Visibility: 65 miles, thin fog 6-hr Max temp: 29F 6-hr Min temp: 28F 24-hr Precip: 0.00 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1155 65 SCT 250 SCT 65 149/29/17/3210G19/997/ 8/088 53008 10029 20028 10 A.M. Weather: Scattered altocumulus and cirrostratus Temperature: 32F; Dew Point: 17F; Relative Humidity: 54% Wind: NW at 15G20 kts Sea-level pressure: 30.01 in Hg; falling, then rising Visibility: 75 miles 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 140 SCT 250 SCT 75 163/32/17/3215G20/001/ 8/088 51014 1 P.M. Weather: Scattered altocumulus, broken cirrus Temperature: 39F, Dew point: 19F; Relative Humidity: 44% Wind: WNW at 9 kts Sea-level pressure: 29.97 inches Hg, falling, then more slowly Visibility: 70 miles 6-hr Max temp: 39F 6-hr Min temp: 28F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1755 140 SCT 250 SCT 70 150/39/19/3009/997/ 8/084 56013 10039 20028 SUMMARY FOR WEDNESDAY, JANUARY 6, 2021 TEMPERATURE (DEGREES F) MAX.......38   NORMAL.....34 MIN.......28   NORMAL.....18 MEAN......33   NORMAL.....26 DEPARTURE FROM 30-YEAR NORMAL.....................+7 TOTAL DEPARTURE FOR THE MONTH.....................+36 [+5.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............32  DEPARTURE...... -7 TOTAL HEATING UNITS FOR THE MONTH..............196  DEPARTURE......-36 TOTAL HEATING UNITS FOR THE SEASON............2126  DEPARTURE.....-410 TOTAL HEATING UNITS LAST SEASON TO DATE.......2427  DEPARTURE.....-301 PEAK WIND GUST FOR YESTERDAY (MPH):                      420C/Official..............30 NW  @  5:27 P.M.                      AEROVANE (south tower).....29 NW  @  4:48 P.M.                      ASOS.......................30 N   @  5:28 P.M.                      DAVIS #1...................29 NW  @  5:27 P.M.                      DAVIS #2 (south tower).....29 NW  @  4:48 P.M.                      RMY........................32                          VECTOR.....................33                          MERLIN.....................32 FASTEST MILE FOR YESTERDAY: CONTACTING/OFFICIAL.............................21 NW  @  5:28 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................22 NW  @  5:28 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............29 NW  @  5:28 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............22 NW  @  5:28 P.M. MAXIMUM 2-MINUTE RMY AVERAGE....................22 NNW @  5:25 P.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................22     @  5:28 P.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL...12.7 NW  [304 total miles]                      ASOS..................12.8     [229 total miles]                      DAVIS #1..............13.0 NNW [231 total miles]                      DAVIS #2..............12.8 NNW [229 total miles]                      RMY...................12.2 NNW [293 total miles]                      VECTOR................12.8     [229 total miles] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.14                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............0.49  DEPARTURE....-0.37                              ASOS.............0.48 TOTAL PRECIPITATION FOR THE YEAR..............0.49  DEPARTURE....-0.37                               ASOS............0.48 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........0.0  DEPARTURE.....-0.6 TOTAL SNOWFALL FOR THE MONTH.................. 1.9  DEPARTURE.....-1.5 TOTAL SNOWFALL FOR THE SEASON.................28.1  DEPARTURE.....+8.7 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/+14/0.61/0.0/112/20      60 S    AERO 67 W    RMY 64 12/02   42/32/37/+1/0.00/0.0/301/54       32 SW   AERO 32 SW   RMY 35 12/03   49/30/40/+4/0.00/0.0/512/92       25 SSW  AERO 25 SSW  RMY 28 12/04   58/40/49/+14/0.06/0.0/332/60      35 SSW  AERO 35 SSW  RMY 37 12/05   42/32/37/+2/2.13/2.8/000/00       58 NNW  AERO 58 NNW  RMY 67 12/06   34/26/30/-5/0.01/T/403/73        E44 WNW  AERO 44 WNW  RMY 49 12/07   33/22/28/-6/T/T/457/83            24 NW   AERO 26 NW   RMY 26 12/08   29/22/26/-8/T/T/006/01            24 NW   AERO 25 NW   RMY 28 12/09   34/19/27/-7/T/T/000/00            16 W    AERO 17 W    RMY 19 12/10   42/30/36/+3/0.00/0.0/351/64       30 WNW  AERO 31 WNW  RMY 29 12/11   50/31/41/+8/0.00/0.0/384/70       32 SW   AERO 35 SW   RMY 34 12/12   48/40/44/+11/0.38/0.0/000/00      25 E    AERO 21 E    RMY 25 12/13   58/35/47/+15/0.00/0.0/109/20      28 W    AERO 31 WSW  RMY 31 12/14   35/30/33/+1/0.10/0.4/000/00       25 N    AERO 25 N    RMY 29 12/15   34/21/28/-4/0.00/0.0/541/99       32 WNW  AERO 33 WNW  RMY 38 12/16   27/13/20/-11/0.14/1.4/180/33      38 E    AERO 37 E    RMY 39 12/17   31/19/25/-6/1.58/15.1/000/00      55 ENE  AERO 56 ENE  RMY 59 12/18   27/18/23/-8/0.00/0.0/120/22       28 N    AERO 26 N    RMY 27 12/19   29/13/21/-9/0.00/0.0/436/80       16 SW   AERO 16 S    RMY 16 12/20   36/24/30/0/0.02/T/000/00          14 S    AERO 16 SW   RMY 14 12/21   34/29/32/+2/0.00/0.0/000/00       22 WNW  AERO 24 WNW  RMY 23 12/22   42/30/36/+7/0.00/0.0/447/82       34 WNW  AERO 35 WNW  RMY 38 12/23   37/26/32/+3/0.00/0.0/480/88       30 WNW  AERO 28 WNW  RMY 31 12/24   53/30/42/+13/T/0.0/153/28         46 SSE  AERO 50 SSE  RMY 55 12/25   61/37/49/+21/2.15/0.0/000/00      68 SSE  AERO 77 SSE  RMY 84 12/26   37/25/31/+3/0.00/0.0/485/89       38 SW   AERO 44 SW   RMY 43 12/27   38/22/30/+2/0.00/0.0/513/94       18 W    AERO 18 W    RMY 20 12/28   49/27/38/+10/T/0.0/109/20         35 SSW  AERO 36 -    RMY 37 12/29   38/20/29/+2/0.00/0.0/470/86       48 WNW  AERO 50 WNW  RMY 56 12/30   40/19/30/+3/0.00/0.0/060/11       39 SW   AERO 41 SW   RMY 45 12/31   44/28/36/+9/0.14/0.0/000/00       38 SW   AERO 43 SW   RMY 43 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 12/25/20: DAILY RECORD PRECIPITATION OF 2.15 INCHES,           BREAKS PREVIOUS RECORD OF 1.37 INCHES SET IN 2002 PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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 01/01   36/25/31/+4/0.06/0.3/.../..       23 E    AERO 23 NNW  RMY 23 01/02   43/30/37/+10/0.30/T/.../..        37 WNW  AERO 39 WNW  RMY 44 01/03   33/27/30/+4/0.07/0.8/.../..       23 NNE  AERO 22 NNE  RMY 25 01/04   37/28/33/+7/0.01/0.1/.../..       25 NNE  AERO 23 NNE  RMY 27 01/05   31/28/30/+4/0.03/0.3/.../..      21 NNW  AERO 21 NNW  RMY 22 01/06   38/28/33/+7/T/T/.../..            30 NW   AERO 29 NW   RMY 32 01/07 The low since midnight is 28F, the daily normal low is 18F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JANUARY 7 HIGH 60F IN 1930 LOW -8F IN 2018 PRECIP 1.97 INS. IN 1977 SNOWFALL 16.0 INS. IN 1977 PEAK GUST 74 MPH NW IN 1968 RECORDS FOR JANUARY 8 HIGH 65F IN 2008 LOW -8F IN 1968 PRECIP 1.70 INS. IN 1958,1979 SNOWFALL 12.5 INS. IN 1996 PEAK GUST 77 MPH NNW IN 1958 TODAY'S REPORT PREPARED BY: Benjamin Turner