BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, DECEMBER 4, 2018  ALL TIMES ARE IN EASTERN STANDARD TIME A COOL AND DRY DAY WITH GOOD VISIBILITY ATOP GREAT BLUE HILL.... Visibility rose since this morning, increasing from 70 miles  at 7 A.M. to 80 miles at 1 P.M. This is in conjunction with  drier air moving in from the northwest with an average wind  speed of 20 mph. Relative humidity dropped from 66% to 44%  during the observation period. The high temperature so far  today is 38F, 6 degrees below the daily normal of 44F. The low since midnight is 30F, 2 degrees above the normal minimum of 28F.        PRELIMINARY STATS FOR NOVEMBER 2018 TEMPERATURE, Deg. F Avg. Max. 45.2 [-4.8] Avg. Min. 32.4 [-1.1] Mean 38.8 [-2.9] 24-hour corrected mean: 38.6 Max. for month: 65F on the 1st and 2nd Min. for month: 9F on the 22nd and 23rd HEATING DEGREE DAYS Total heating units: 776 [+78] Total for the season: 1320 [+351] Total for last season: 969 PRECIPITATION, Inches Total: 10.32 in. [+5.56] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: 7.6 in. [+5.3] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: N/A Avg. corrected wind speed: N/A Prevailing wind direction: N/A Peak gust and direction: N/A  SUNSHINE: Campbell-Stokes card minutes: N/A Astronomical total minutes: N/A BHO Wettest Novembers, inches (1886-2018): 1) 10.32 in 2018 2) 9.78 in 1983 3) 9.29 in 1945 4) 9.17 in 1972 5) 8.95 in 1895 6) 8.93 in 1988 7) 8.79 in 1963   BHO Wettest Falls (Sep-Nov), inches (1886-2018): 1) 25.42 in 2018 2) 23.18 in 2005 3) 23.13 in 1996 4) 22.47 in 1888 5) 20.65 in 2011 6) 20.64 in 1932 7) 20.08 in 1962      Today's Observations: 7 A.M. Weather: Scattered altocumulus Temperature: 30F; Dew Point: 20F; Wind: NW at 15G22 kts   Sea-level pressure: 29.79 ins. Hg, rising steadily         Visibility: 70 miles 6-hr Max temp: 37F 6-hr Min temp: 30F 24-hr Precip: 0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins.    BHO SA 1155 100 SCT 70 087/30/20/3215G22/979/  8/070 51019 10037 20030  10 A.M. Weather: Scattered cumulus Temperature: 35F; Dew Point: 21F; Wind: NW at 15G22 kts  Sea-level pressure: 29.84 ins. Hg, rising steadily Visibility: 75 miles 3-hr Precip: 0.00 ins.  3-hr snowfall: 0.0 ins.  BHO SA 1455 40 SCT 75 106/35/21/3215G22/984/ 8/100  51019 1 P.M. Weather: Scattered cumulus      Temperature: 37F; Dew Point: 17F; Wind: NW at 15G22 knots   Sea-level pressure: 29.83 ins. Hg, falling slowly        Visibility: 80 miles 6-hr Max temp: 38F 6-hr Min temp: 30F 6-hr Precip: 0.00 ins. 6-hr snowfall: 0.0 ins. Snow depth: 0 ins.    BHO SA 1755 40 SCT 80 103/37/17/3215G22/983/ 8/100  56003 10038 20030   SUMMARY FOR MONDAY, DECEMBER 3, 2018  TEMPERATURE (DEGREES F) MAX.....54   NORMAL.....44 MIN.....38   NORMAL.....28 MEAN....46   NORMAL.....36 DEPARTURE FROM 30-YEAR NORMAL.......................+10 TOTAL DEPARTURE FOR THE MONTH.......................+16 [+5.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............19   DEPARTURE........-10 TOTAL HEATING UNITS FOR THE MONTH..............70   DEPARTURE........-17 TOTAL HEATING UNITS FOR THE SEASON...........1390   DEPARTURE........+42 TOTAL HEATING UNITS LAST SEASON TO DATE......1048   DIFFERENCE......+342 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY....................35 W   AT 12:40 P.M.                    AERO.........................35 W   AT 12:42 P.M.                     ASOS.........................35 W   AT 12:46 P.M.                     DAVIS........................37 WNW AT 12:44 P.M. RMY 38 FASTEST MILE FOR YESTERDAY......................25 W   AT 12:46 P.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...................25 W   AT 12:46 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................28 W   AT 12:46 P.M. AVERAGE WIND SPEED AND DIRECTION...............13.6 W                    ASOS........................13.8                    DAVIS.......................13.8 W [274 deg.]    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..........1.04  DEPARTURE.......+0.56                          ASOS..............0.80 TOTAL PRECIPITATION FOR THE YEAR..........64.41  DEPARTURE......+15.59                          ASOS.............66.43 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.3 TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE........-0.8 TOTAL SNOWFALL FOR THE SEASON...............7.6  DEPARTURE........+4.2 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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 11/01 65/49/57/+11/..../006/01         25 SSW AERO 24 SSW RMY N/A 11/02 65/52/59/+13/..../000/00         37 SSW AERO 41 SSW RMY N/A 11/03 64/42/53/+7/..../148/24          59 W   AERO 60 W   RMY 58 11/04 52/37/45/0/..../588/96           31 W   AERO 30 W   RMY N/A 11/05 49/40/45/0/..../000/00           30 ENE AERO 29 ENE RMY 28 11/06 58/45/52/+7/..../000/00          29 SSW AERO 29 SSW RMY 31 11/07 60/50/55/+10/..../593/98         30 WSW AERO 30 WSW RMY 32 11/08 52/37/45/+1/..../470/78          29 WNW AERO 26 WNW RMY 23 11/09 48/34/41/-3/..../240/40          43 E   AERO 40 E   RMY 42 11/10 45/32/39/-5/..../000/00          45 W   AERO 47 WNW RMY 46 11/11 43/30/37/-6/0.00/596/100         32 WNW AERO 30 W   RMY 32 11/12 48/27/38/-5/0.00/475/80          18 SW  AERO 18 SW  RMY N/A 11/13 52/37/45/+2/..../000/00          44 WNW AERO 44 WNW RMY 48 11/14 37/20/29/-13/..../471/80         45 WNW AERO 50 WNW RMY 50 11/15 30/19/25/-17/..../000/00         33 E   AERO 36 E   RMY N/A 11/16 41/30/36/-6/..../000/00          43 E   AERO 44 ENE RMY N/A 11/17 45/34/40/-1/0.00/111/19          28 W   AERO 27 W   RMY 28 11/18 40/30/35/-6/0.00/157/27          21 W   AERO 21 W   RMY M 11/19 38/33/36/-5/..../000/00          16 E   AERO 14 E   RMY N/A 11/20 38/31/35/-5/..../000/00          30 NE  AERO 30 NE  RMY N/A 11/21 39/20/30/-10/..../081/14         40 WNW AERO 46 WNW RMY 47 11/22 20/09/15/-25/..../567/99         36 NW  AERO 41 NW  RMY 42 11/23 30/09/20/-19/0.00/548/96         25 SW  AERO 25 SW  RMY 27 11/24 43/24/34/-5/..../302/53          27 SW  AERO 27 ESE RMY N/A 11/25 43/40/42/+3/..../000/00          39 ENE AERO 39 ENE RMY 39 11/26 44/39/42/+4/..../000/00          45 E   AERO 44 E   RMY 45 11/27 45/33/39/+1/..../141/25          44 ENE AERO 44 ENE RMY N/A 11/28 39/31/35/-3/..../180/32          37 WNW AERO 41 WNW RMY 42 11/29 43/30/37/0/..../315/56           40 NW  AERO 41 NW  RMY 44  11/30 39/27/33/-4/0.00/370/66          18 NW  AERO 16 NW  RMY N/A DAILY RECORDS FOR NOVEMBER 2017 11/22/18: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 20F,           BREAKS PREVIOUS RECORD OF 26F SET IN 1972 AND 2008 11/22/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,           BREAKS PREVIOUS RECORD OF 12F SET IN 1987 11/23/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,           TIES PREVIOUS RECORD OF 9F SET IN 1888 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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 12/01 41/28/35/-2/0.00/.../..          20 NNW AERO 18 NNW RMY N/A 12/02 52/35/44/+8/1.04/.../..          28 ESE AERO 25 ESE RMY 27 12/03 54/38/46/+10/0.00/.../..         35 W   AERO 35 W   RMY 38  12/04 Low temp since midnight is 30F; normal low is 28F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 4 HIGH 67 IN 1998 LOW -4 IN 1940 PRECIP 1.87 INS. IN 1968 SNOWFALL 6.0 INS. IN 1907 PEAK GUST 73 MPH WNW IN 1980 RECORDS FOR DECEMBER 5 HIGH 65 IN 2001 LOW -1 IN 1926 PRECIP 2.86 INS. IN 1993 SNOWFALL 7.0 INS. IN 1926, 1981 PEAK GUST 67 MPH WNW IN 1961, S IN 1973 TODAY'S REPORT PREPARED BY: Benjamin Turner