BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, DECEMBER 7, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME ANOTHER FAIR WEATHER LATE AUTUMN DAY ATOP GREAT BLUE HILL.... Visibility was at 20 miles this morning, due a significant haze. It has since increased to 75 miles at the 1 P.M. observation. Wind from the west-northwest has picked up since this morning, with a max gust of 29 mph occurring shortly after noontime. Amidst sunny conditions and almost clear skies, the temperature only increased a degree between the 10 A.M. and the 1 P.M. observations. The high temperature so far today is 37F, 5 degrees below the daily normal of 42F. The low since midnight is 29F, 3 degrees above the normal minimum of 27F. 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: 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 Today's Observations: 7 A.M. Weather: Clear, few distant cumulus Temperature: 29F; Dew Point: 25F; Wind: W at 13G22 kts Sea-level pressure: 30.14 ins. Hg, rising, then more rapidly Visibility: 20 miles, hazy 6-hr Max temp: 32F 6-hr Min temp: 29F 24-hr Precip: 0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins. BHO SA 1155 CLR 20 208/29/25/2713G22/014/ FEW DSNT CU ALQDS HAZY/ 8/100 53020 10032 20029 10 A.M. Weather: Clear, few distant cumulus Temperature: 34F; Dew Point: 17F; Wind: NW at 12G22 kts Sea-level pressure: 30.21 ins. Hg, rising steadily Visibility: 70 miles 3-hr Precip: 0.00 ins. 3-hr snowfall: 0.0 ins. BHO SA 1455 CLR 70 229/34/17/3112G22/021/ FEW DSNT CU ALQDS/ 8/100 51021 1 P.M. Weather: Clear, few cumulus Temperature: 35F; Dew Point: 12F; Wind: WNW at 12G24 kts Sea-level pressure: 30.20 ins. Hg, falling steadily Visibility: 75 miles 6-hr Max temp: 37F 6-hr Min temp: 29F 6-hr Precip: 0.00 ins. 6-hr snowfall: 0.0 ins. Snow depth: 0 ins. BHO SA 1755 CLR 75 227/35/12/3012G24/020/ FEW CU ALQDS/ 8/100 58002 10037 20029 SUMMARY FOR THURSDAY, DECEMBER 6, 2018 TEMPERATURE (DEGREES F) MAX.....37 NORMAL.....42 MIN.....24 NORMAL.....27 MEAN....31 NORMAL.....35 DEPARTURE FROM 30-YEAR NORMAL........................-4 TOTAL DEPARTURE FOR THE MONTH........................-1 [+/-0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............34 DEPARTURE.........+4 TOTAL HEATING UNITS FOR THE MONTH.............177 DEPARTURE..........0 TOTAL HEATING UNITS FOR THE SEASON...........1497 DEPARTURE........+59 TOTAL HEATING UNITS LAST SEASON TO DATE......1115 DIFFERENCE......+382 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................29 NNW AT 1:47 P.M. AERO.........................28 W AT 11:56 A.M. ASOS.........................29 W AT 11:59 A.M. DAVIS........................30 W AT 11:01 A.M. RMY 30 FASTEST MILE FOR YESTERDAY......................24 W AT 1:16 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................23 W AT 1:19 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................25 W AT 1:20 P.M. AVERAGE WIND SPEED AND DIRECTION..............11.5 W ASOS.......................11.6 DAVIS......................11.6 W [266 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.......+0.06 ASOS..............0.81 TOTAL PRECIPITATION FOR THE YEAR..........64.40 DEPARTURE......+15.08 ASOS.............66.44 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........-1.7 TOTAL SNOWFALL FOR THE SEASON...............7.6 DEPARTURE........+3.3 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 38/23/31/-4/0.00/.../.. 30 WNW AERO 31 WNW RMY 33 12/05 33/18/26/-9/0.00/.../.. 16 NNW AERO 15 NNW RMY N/A 12/06 37/24/31/-4/0.00/.../.. 29 W AERO 28 W RMY 30 12/07 Low temp since midnight is 29F; normal low is 27F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 7 HIGH 74 IN 1998 LOW 6 IN 1906 PRECIP 1.67 INS. IN 1953 SNOWFALL 6.3 INS. IN 2003 PEAK GUST 76e SE IN 1976 RECORDS FOR DECEMBER 8 HIGH 62 IN 1966 LOW -4 IN 1906 PRECIP 1.54 INS. IN 1969 SNOWFALL 2.5 INS. IN 2001 PEAK GUST 78e W IN 1979 TODAY'S REPORT PREPARED BY: Benjamin Turner