BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, DECEMBER 12, 2018  ALL TIMES ARE IN EASTERN STANDARD TIME ANOTHER DRY AND COOL LATE AUTUMN DAY ATOP  GREAT BLUE HILL.... Visibility has been less than 40 miles on average  due to a distant haze. Wind increased since this morning, with a max wind of 30 mph from the NW.  The most cloud cover observed was this morning, where half the sky was covered with altocumulus  clouds. They decreased as pressure rose 3 millibars throughout the day. The max temperature so far is 35F,  5 degrees below the daily normal of 40F. The low  since midnight is 23F, 2 degrees below the daily  normal minimum of 25F.   BHO Wettest Novembers, inches (1886-2018): 1) 10.31 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) 25.41 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      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: 10.31 in. [+5.55] Greatest in 24 hrs: 1.78 ins. on 9th-10th SNOWFALL, Inches Total: 7.6 in. [+5.3] Greatest in 24 hrs: 7.5 ins. on 16th-17th  WIND, mph Avg. uncorrected wind speed: 13.1 Avg. corrected wind speed: 13.4 Prevailing wind direction: WNW at 15%   Peak gust and direction: 59 W on the 3rd SUNSHINE: Campbell-Stokes card minutes: 6144 minutes of possible 17010 or 36% Astronomical total minutes:   6359 minutes of possible 17623 or 36% Today's Observations: 7 A.M. Weather: Scattered altocumulus, few distant cumulus Temperature: 24F; Dew Point: 15F; Wind: NW at 8G14 kts   Sea-level pressure: 29.97 ins. Hg, rising steadily        Visibility: 30 miles, distant haze  6-hr Max temp: 24F 6-hr Min temp: 15F 24-hr Precip: 0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins.    BHO SA 1155 80 SCT 30 148/24/15/3208G14/997/  FEW CU DSNT HZ ALQDS/ 8/170 53027 10028 20023 10 A.M. Weather: Clear, few distant cumulus   Temperature: 30F; Dew Point: 18F; Wind: NW at 15G24 kts   Sea-level pressure: 29.98 ins. Hg, rising steadily Visibility: 40 miles, distant haze   3-hr Precip: 0.00 ins.  BHO SA 1455 CLR 40 154/30/18/3215G24/998/ FEW CU DSNT  HZ ALQDS/ 8/100 51016 1 P.M. Weather: Scattered cumulus      Temperature: 34F; Dew Point: 13F; Wind: NW at 15G24 kts, Peak wind: 30 mph (26 kts) NW at 12:35 P.M.    Sea-level pressure: 30.01 ins. Hg, rising steadily        Visibility: 40 miles, distant haze 6-hr Max temp: 35F 6-hr Min temp: 24F 6-hr Precip: 0.00 ins. 6-hr snowfall: 0.0 ins. Snow depth: 0 ins.    BHO SA 1755 50 SCT 40 161/34/13/3215G24/001/ DSNT HZ ALQDS  PK WND 3226/35/ 8/100 53007 10035 20024    SUMMARY FOR TUESDAY, DECEMBER 11, 2018  TEMPERATURE (DEGREES F) MAX.....36   NORMAL.....41 MIN.....17   NORMAL.....25 MEAN....27   NORMAL.....33 DEPARTURE FROM 30-YEAR NORMAL........................-6 TOTAL DEPARTURE FOR THE MONTH.......................-37 [-3.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............38   DEPARTURE.........+6 TOTAL HEATING UNITS FOR THE MONTH.............370   DEPARTURE........+37 TOTAL HEATING UNITS FOR THE SEASON...........1690   DEPARTURE........+96 TOTAL HEATING UNITS LAST SEASON TO DATE......1274   DIFFERENCE......+416 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY....................16 WSW AT 1:36 P.M.                    AERO.........................14 WSW AT 1:24 P.M.                     ASOS.........................16 WSW AT 1:36 P.M.                     DAVIS........................16 WSW AT 1:36 P.M. RMY N/A FASTEST MILE FOR YESTERDAY......................10 S   AT 5:03 P.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...................12 S   AT 6:04 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................12 WSW AT 1:37 P.M. AVERAGE WIND SPEED AND DIRECTION...............6.6 NNW                    ASOS........................7.3                    DAVIS.......................7.1 NW [312 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.......-0.77                          ASOS..............1.78 TOTAL PRECIPITATION FOR THE YEAR..........64.41  DEPARTURE......+14.26                          ASOS.............67.41 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.4 TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE........-3.6 TOTAL SNOWFALL FOR THE SEASON...............7.6  DEPARTURE........+1.4 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/+11/0.00/006/01         25 SSW AERO 24 SSW RMY N/A 11/02 65/52/59/+13/0.37/000/00         37 SSW AERO 41 SSW RMY N/A 11/03 64/42/53/+7/1.43/148/24          59 W   AERO 60 W   RMY 58 11/04 52/37/45/0/0.00/588/96           31 W   AERO 30 W   RMY N/A 11/05 49/40/45/0/0.34/000/00           30 ENE AERO 29 ENE RMY 28 11/06 58/45/52/+7/0.97/000/00          29 SSW AERO 29 SSW RMY 31 11/07 60/50/55/+10/0.00/593/98         30 WSW AERO 30 WSW RMY 32 11/08 52/37/45/+1/0.00/470/78          29 WNW AERO 26 WNW RMY 23 11/09 48/34/41/-3/1.23/240/40          43 E   AERO 40 E   RMY 42 11/10 45/32/39/-5/0.55/000/00          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/+2/1.07/000/00          44 WNW AERO 44 WNW RMY 48 11/14 37/20/29/-13/0.00/471/80         45 WNW AERO 50 WNW RMY 50 11/15 30/19/25/-17/0.71/000/00         33 E   AERO 36 E   RMY N/A 11/16 41/30/36/-6/0.69/000/00          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/-5/0.03/000/00          16 E   AERO 14 E   RMY N/A 11/20 38/31/35/-5/0.46/000/00          30 NE  AERO 30 NE  RMY N/A 11/21 39/20/30/-10/0.00/081/14         40 WNW AERO 46 WNW RMY 47 11/22 20/09/15/-25/0.00/567/99         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/-5/0.00/302/53          27 SW  AERO 27 ESE RMY N/A 11/25 43/40/42/+3/0.94/000/00          39 ENE AERO 39 ENE RMY 39 11/26 44/39/42/+4/0.92/000/00          45 E   AERO 44 E   RMY 45 11/27 45/33/39/+1/0.60/141/25          44 ENE AERO 44 ENE RMY N/A 11/28 39/31/35/-3/0.00/180/32          37 WNW AERO 41 WNW RMY 42 11/29 43/30/37/0/0.00/315/56           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/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 41/28/35/-2/0.00/0.0/391/70          20 NNW AERO 18 NNW RMY N/A 12/02 52/35/44/+8/1.04/0.0/000/00          28 ESE AERO 25 ESE RMY 27 12/03 54/38/46/+10/0.00/0.0/178/32         35 W   AERO 35 W   RMY 38  12/04 38/23/31/-4/0.00/0.0/516/93          30 WNW AERO 31 WNW RMY 33 12/05 33/18/26/-9/0.00/0.0/432/78          16 NNW AERO 15 NNW RMY N/A 12/06 37/24/31/-4/0.00/0.0/354/64          29 W   AERO 28 W   RMY 30 12/07 37/21/29/-5/0.00/0.0/.../..          29 NW  AERO 29 NW  RMY 32 12/08 27/15/21/-13/0.00/0.0/.../..         28 NW  AERO 27 NW  RMY 29 12/09 34/17/26/-8/0.00/0.0/.../..          23 SSW AERO 21 SSW RMY 22 12/10 36/22/29/-4/0.00/0.0/.../..          24 NNW AERO 23 NNW RMY 22 12/11 36/17/27/-6/0.00/0.0/.../..          16 WSW AERO 14 WSW RMY N/A 12/12 Low temp since midnight is 23F; normal low is 25F DAILY EXTREMES Temperature and precipitation records back to 1885, and RECORDS FOR DECEMBER 12 HIGH 67 IN 1979 LOW -3 IN 1988 PRECIP 3.94 INS. IN 1992 SNOWFALL 20.3 INS. IN 1960 PEAK GUST 75 MPH SSE IN 2008 RECORDS FOR DECEMBER 13 HIGH 60 IN 1984 LOW 0 IN 1893 PRECIP 1.45 INS. IN 1983 SNOWFALL 9.2 INS. IN 2007 PEAK GUST 81e WNW IN 1976 TODAY'S REPORT PREPARED BY: Benjamin Turner