BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, JANUARY 12, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0712E SUNSET:  1634E QUIET AND DRY WEATHER CONTINUES AT BLUE HILL.... The quiet and dry weather pattern continues. Following 5 consecutive days with measurable precipitation to open the month, we've now gone the other way with the last 5 days seeing not even a trace. Today will make day 6 of this dry spell. The monthly (and yearly) precipitation is only 0.49", this is now 1.07" below normal for the month to date. Of course below normal precipitation in January means we haven't seen much snow either with only 1.9" measured for the month to date. This is now 4.4" below normal to date. In addition to the dry conditions, temperatures have been running above normal as well, with the month currently running 5.4 degrees above normal per day. It should be noted however, that the majority of this "warmth" has been occurring at night, with many of our daily low temperatures running 7-15 degrees above normal. The coldest low temperature so far this month was 20 degrees back on the 9th, and this low was 3 degrees above normal for the date. So this really gives a good indication of where our above normal temperatures are coming from. As for today, generally a mix of sun and clouds have been observed with rather hazy conditions thanks to an inversion this morning. This inversion has been mixing out early this afternoon with the visibility rising from 15-20 miles to 40 miles as well as an increase in winds, which are gusting to just under 20 mph. The high temperature so far today is 40F, 6 degrees above the daily normal maximum of 34F. The low since midnight is 24F, 7 degrees above the normal minimum of 17F. 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: 6756 minutes of a possible 16470 or 41% Astronomical total minutes: 6961 minutes of a possible 16991 or 41% Today's Observations: 7 A.M. Weather: Scattered altocumulus, scattered cirrostratus, thin broken cirrus, thin smoke layer all quadrants Temperature: 25F; Dew Point: 20F; Relative Humidity: 81% Wind: WNW at 8 kts Sea-level pressure: 30.07 in Hg; steady, then falling Visibility: 15 miles, hazy 6-hr Max temp: 27F 6-hr Min temp: 24F 24-hr Precip: 0.00 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1155 55 SCT 200 SCT E250 -BKN 15 184/25/20/2908/007/ THN K LYR ALQDS HAZY/ 8/078 55001 10027 20024 10 A.M. Weather: Thin overcast cirrus, few breaks in overcast distant NW-NE, few altocumulus distant WNW-NW, thin smoke layer all quadrants Temperature: 35F; Dew Point: 26F; Relative Humidity: 69% Wind: W at 7G16 kts Sea-level pressure: 30.10 in Hg; rising, then more slowly Visibility: 20 miles, hazy 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 E250 -OVC 20 194/35/26/2807G16/010/ FEW DSNT BINOVC NW-NE FEW AC DSNT WNW-NW THN K LYR ALQDS HAZY/ 8/071 51010 1 P.M. Weather: Scattered stratocumulus, thin broken cirrus Temperature: 39F, Dew point: 21F; Relative Humidity: 48% Wind: WNW at 8G16 kts Sea-level pressure: 30.04 inches Hg, falling, then more slowly Visibility: 40 miles, hazy 6-hr Max temp: 40F 6-hr Min temp: 24F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1755 40 SCT E250 -BKN 40 174/39/21/2908G16/004/ HAZY/ 8/501 56020 10040 20024 SUMMARY FOR MONDAY, JANUARY 11, 2021 TEMPERATURE (DEGREES F) MAX.......34   NORMAL.....34 MIN.......25   NORMAL.....17 MEAN......30   NORMAL.....25 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........+5 TOTAL DEPARTURE FOR THE MONTH...................+62 [+5.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............35  DEPARTURE.......-5 TOTAL HEATING UNITS FOR THE MONTH..............367  DEPARTURE......-61 TOTAL HEATING UNITS FOR THE SEASON............2297  DEPARTURE.....-436 TOTAL HEATING UNITS LAST SEASON TO DATE.......2573  DEPARTURE.....-276 PEAK WIND GUST (MPH):                      420C/Official..............17 SW   @ 10:48 A.M.                      AEROVANE (south tower).....16 SSW  @  8:56 A.M.                      ASOS.......................15 SW   @ 12:05 P.M.                      DAVIS #1...................16 WSW  @ 11:46 A.M.                      DAVIS #2 (south tower).....15 SW   @ 10:45 A.M.                      RMY........................16      @ 11:46 A.M.                      VECTOR.....................18      @ 11:46 A.M.                      MERLIN.....................16 FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................13 N   @ 12:16 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................13 N   @ 12:42 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............13 N   @ 12:09 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............13 N   @ 12:11 A.M. MAXIMUM 2-MINUTE RMY AVERAGE....................12 NNE @ 12:26 A.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................13     @ 12:11 A.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL... 7.7 WSW [184 total miles]                      ASOS.................. 8.3     [199 total miles]                      DAVIS #1.............. 8.4 W   [202 total miles]                      DAVIS #2.............. 8.4 W   [202 total miles]                      RMY................... 8.2 W   [197 total miles]                      VECTOR................ 8.4     [202 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....-1.07                              ASOS.............0.48 TOTAL PRECIPITATION FOR THE YEAR..............0.49  DEPARTURE....-1.07                               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.....-4.4 TOTAL SNOWFALL FOR THE SEASON.................28.1  DEPARTURE.....+5.8 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/+4/0.05/0.7/.../..       21 NNW  AERO 21 NNW  RMY 22 01/06   38/28/33/+7/T/T/.../..            30 NW   AERO 29 NW   RMY 32 01/07   42/26/34/+8/0.00/0.0/.../..       28 NNW  AERO 26 NNW  RMY 31 01/08   40/21/31/+5/0.00/0.0/.../..       25 NNW  AERO 22 NNW  RMY 25 01/09   34/30/27/+1/0.00/0.0/.../..       25 N    AERO 23 N    RMY 24 01/10   39/24/32/+7/0.00/0.0/.../..       25 NNW  AERO 23 NNW  RMY 24 01/11   34/25/30/+5/0.00/0.0/.../..       17 SW   AERO 16 SSW  RMY 16 01/12 The low since midnight is 24F, the daily normal low is 17F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JANUARY 12 HIGH 68F IN 2020 [RECORD FOR MONTH] LOW -15F IN 1886 PRECIP 2.04 INS. IN 2011 SNOW 18.2 INS. IN 2011 WIND 84e MPH S IN 1980 RECORDS FOR JANUARY 13 HIGH 60F IN 2018 LOW -10F IN 1912,1914 PRECIP 1.54 INS. IN 1979 SNOWFALL 12.6 INS. IN 1964 PEAK GUST 74 MPH NE IN 1964 TODAY'S REPORT PREPARED BY: Matt Douglas