BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, NOVEMBER 19, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME VERY COLD START, GRADUALLY MODERATING UNDER A MIX OF SUN AND CLOUDS... A very cold air mass settled over the region yesterday marking the coldest day of the season thus far with the high only getting to the freezing mark. As a matter of fact we spent 35 consecutive hours at or below freezing starting late Tuesday night through late this morning. The cold air mass, which was accompanied by a rather strong high pressure area (~30.60 in/hg), is now starting to retreat from the region as surface pressures fall and the wind has become south-southwest with increasing speed. Despite the cold and dry air mass, visibility has not been all that stellar, holding at around 50-55 miles. The high so far today is 39F, 10 degrees below the daily normal high of 49F. The low since midnight is 18F, 15 degrees below the normal low of 33F.  PRELIMINARY STATS FOR OCTOBER 2020 TEMPERATURE, Deg. F Avg. Max. 61.2 [+0.9] Avg. Min. 45.5 [+2.6] Mean      53.4 [+1.8] 24-hour corrected mean: 52.7 Max. for month: 75F on the 1st and 10th Min. for month: 24F on the 31st HEATING DEGREE DAYS Total heating units:   354  [-67] Total for the season:  452 [-111] Total for last season: 440 COOLING DEGREE DAYS Total cooling units:      1  [-4] Total for the season:   831  [+229] Total for last season:  682 PRECIPITATION, Inches Total: 6.75 [+2.06] Greatest in 24 hrs: 2.24 inches on the 16-17th SNOWFALL, Inches Total: 6.5 [+6.2] Greatest in 24 hrs: 6.5 inches on the 30th WIND, mph Avg. uncorrected wind speed: 10.7 mph Avg. corrected wind speed:   11.3 mph Prevailing wind direction:   S [12%] Peak gust and direction:     76 S on the 7th SUNSHINE: Campbell-Stokes card minutes: 10008 minutes of a possible 19824 or 50% Astronomical total minutes: 10345 minutes of a possible 20500 or 50% Today's Observations: 7 A.M. Weather: Broken altocumulus, thin broken cirrus, few stratocumulus offshore distant ENE-ESE Temperature: 22F; Dew Point: 13F; Relative Humidity: 68% Wind: SSW at 5 kts, wind light Sea-level pressure: 30.59 ins. Hg, rising unsteadily Visibility: 50 miles 6-hr Max temp: 22F 6-hr Min temp: 18F 24-hr Precip: 0.00 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1155 E90 BKN 250 -BKN 50 358/22/13/2105/059/ FEW SC OFFSHR DSNT ENE-ESE THN K LYR ALNG HRZN ALQDS WND LGT/ 8/551 52006 10022 20018 10 A.M. Weather: Broken altocumulus/altostratus, thin broken cirrus, few stratocumulus offshore distant NE-ENE and distant SSE-SSW Temperature: 27F; Dew Point: 13F; Relative Humidity: 55% Wind: SW at 7 kts Sea-level pressure: 30.58 ins. Hg: rising, then falling Visibility: 50 miles 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 E110 BKN 250 -BKN 50 355/27/13/2207/058/ FEW SC OFFSHR DSNT NE-ENE AND DSNT SSE-SSW THN K LYR ALQDS/ 8/571 58003 1 P.M. Weather: Broken cirrostratus, thin broken cirrus, few stratocumulus distant ESE-S-SSW Temperature: 38F; Dew Point: 22F; Relative Humidity: 52% Wind: S at 13G21 kts Sea-level pressure: 30.47 ins. Hg: falling, then more rapidly Visibility: 55 miles 6-hr Max temp: 39F 6-hr Min temp: 22F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1755 E190 BKN 250 -BKN 55 317/38/22/1813G21/047/ FEW SC DSNT ESE-S-SSW/ 8/508 58038 10039 20022 SUMMARY FOR WEDNESDAY, NOVEMBER 18, 2020 TEMPERATURE (DEGREES F) MAX.......32   NORMAL.....49 MIN.......19   NORMAL.....33 MEAN......26   NORMAL.....41 DEPARTURE FROM 30-YEAR NORMAL................... -15 TOTAL DEPARTURE FOR THE MONTH...................+110 [+5.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............39  DEPARTURE......+15 TOTAL HEATING UNITS FOR THE MONTH..............274  DEPARTURE.....-109 TOTAL HEATING UNITS FOR THE SEASON.............726  DEPARTURE.....-220 TOTAL HEATING UNITS LAST SEASON TO DATE........926  DEPARTURE.....-200 PEAK WIND GUST FOR YESTERDAY (MPH):                      420C/Official..............40 NW   AT  8:59 A.M.                      AEROVANE (south tower).....46 NW   AT  9:01 A.M.                      ASOS.......................38 NW   AT  8:47 A.M.                      DAVIS #1...................40 NW   AT  8:59 A.M.                      DAVIS #2 (south tower).....40 NW   AT  9:00 A.M.                      RMY........................43                      VECTOR.....................45                      MERLIN.....................46 FASTEST MILE FOR YESTERDAY: CONTACTING/OFFICIAL.............................29 NW   AT  9:01 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................26 NW   AT  9:01 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............29 NW   AT  8:47 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............29 NW   AT  9:01 A.M. AVERAGE WIND SPEED AND DIRECTION:                     CONTACTING/OFFICIAL......12.1 NW  [291 total miles]                     ASOS.....................11.9     [286 total miles]                     DAVIS #1.................12.3 NNW [295 total miles]                     DAVIS #2.................12.2 NNW [293 total miles]                     VECTOR...................12.1     [291 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.............1.74  DEPARTURE....-1.09                              ASOS.............1.78 TOTAL PRECIPITATION FOR THE YEAR.............42.91  DEPARTURE....-3.69                               ASOS...........43.73 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........0.0  DEPARTURE......0.0 TOTAL SNOWFALL FOR THE MONTH.................Trace  DEPARTURE.....-0.8 TOTAL SNOWFALL FOR THE SEASON..................6.5  DEPARTURE.....+5.4 PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/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 10/01  75/56/66/+9/0.00/591/84           28 SW    AERO 28 SW   RMY N/A 10/02  63/49/56/-1/0.02/203/29           20 NW    AERO 21 NW   RMY 20 10/03  65/45/55/-1/0.00/676/97           19 WNW   AERO 19 WNW  RMY 19 10/04  65/45/55/-1/0.00/659/95           17 ESE   AERO 18 ESE  RMY 18 10/05  62/52/57/+1/0.00/277/40           17 ENE   AERO 17 ENE  RMY N/A 10/06  69/51/60/+5/0.00/503/73           28 S     AERO 28 S    RMY 29 10/07  73/50/62/+7/0.14/316/46           76 W     AERO 74 W    RMY 70  TSTM 10/08  61/42/52/-2/0.00/676/99           41 W     AERO 41 W    RMY N/A 10/09  60/37/49/-5/0.00/646/95           25 SSW   AERO 28 SSW  RMY N/A 10/10  75/52/64/+10/0.00/549/81          40 SSW   AERO 40 SSW  RMY 38 10/11  64/47/56/+3/0.00/574/85           32 NNW   AERO 35 NNW  RMY N/A 10/12  52/48/50/-3/T/000/00              28 E     AERO 27 E    RMY N/A 10/13  57/49/53/0/1.74/000/00            32 E     AERO 33 E    RMY N/A 10/14  67/47/57/+5/0.00/606/91           23 WNW   AERO 25 WNW  RMY N/A 10/15  71/50/61/+9/0.00/511/77           43 S     AERO 46 S    RMY 42 10/16  68/48/58/+7/1.00/020/03           28 S     AERO 30 S    RMY N/A 10/17  56/39/48/-3/1.24/480/73           35 WNW   AERO 40 WNW  RMY 37 10/18  60/46/53/+2/0.00/622/95           20 ESE   AERO 21 ESE  RMY 20 10/19  61/46/54/+4/0.00/575/88           16 ESE   AERO 16 SSE  RMY N/A 10/20  66/49/58/+8/0.00/065/10           22 S     AERO 22 S    RMY 22 10/21  71/56/64/+14/0.06/000/00          26 SSW   AERO 26 SSW  RMY 26 10/22  70/54/62/+13/0.00/471/73          18 SSW   AERO 17 SSW  RMY N/A 10/23  68/52/60/+11/0.00/340/53          18 ESE   AERO 18 ESE  RMY 18 10/24  68/42/55/+6/0.00/217/34           32 NNW   AERO 32 NNW  RMY 32 10/25  50/40/45/-4/0.00/134/21           19 NNW   AERO 19 NNW  RMY N/A 10/26  52/43/48/0/0.02/000/00            20 E     AERO 18 ESE  RMY 20 10/27  52/43/48/0/T/038/06               22 NNW   AERO 22 NNW  RMY N/A 10/28  49/42/46/-2/0.33/000/00           18 W     AERO 18 W    RMY 18 10/29  46/41/44/-3/1.26/000/00           39 NE    AERO 38 NE   RMY 38 10/30  41/26/34/-13/0.94/000/00          37 NNE   AERO 44 NNE  RMY N/A 10/31  39/24/32/-15/0.00/596/96          18 SSE   AERO 20 SSE  RMY 17 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   The low since midnight is 18F, the daily normal low is 33F 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 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 19 HIGH 72 IN 1941 LOW 10 IN 1936 PRECIP 1.92 INCHES IN 1926 SNOWFALL 11.0 INS IN 1986 PEAK GUST 59e E IN 1945 RECORDS FOR NOVEMBER 20 HIGH 72 IN 1953 LOW 10 IN 1894 PRECIP 2.78 INS IN 1988 SNOWFALL 3.0 INS IN 1897 PEAK GUST 73e S IN 1950 TODAY'S REPORT PREPARED BY: Matt Douglas