BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, DECEMBER 4, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME MUCH QUIETER CONDITIONS TODAY FOLLOWING THE LONG DURATION STORM... First a recap of our storm.. for the 24 hours ending at 7 AM this morning, 3.1" of snow was recorded, bringing the storm total snowfall to 13.1". 0.26" of liquid equivalent was measured for the 24 hours ending at 7 A.M., bringing the storm total to 2.43". The peak gust during the storm was 52 mph out of the NE at 12:42 PM on Monday. Despite the storm being long gone now, we still can't seem to find the sun. Overcast skies have been the theme today with cold temperatures. Winds have been light all day, so despite the cold air, it doesn't really feel that bad out. Visibility started out around 60 miles early this morning, but has been dropping off as the day progressed. By 1 PM, it was down to only 30 miles. It has become increasingly hazy as the dew point has risen. The high so far today is 33F, which is 10 degrees below the daily normal maximum of 43F. The low since midnight is 22F, which is 6 degrees below the normal minimum of 28F. PRELIMINARY STATS FOR NOVEMBER 2019 TEMPERATURE, Deg. F Avg. Max. 46.0 [-4.0] Avg. Min. 30.3 [-3.2] Mean 38.2 [-3.5] 24-hour corrected mean: 38.0 Max. for month: 67F on the 1st Min. for month: 15F on the 13th HEATING DEGREE DAYS Total heating units: 761 [+99] Total for the season: 1237 [-24] Total for last season: 1319 PRECIPITATION, Inches Total: 3.74 [-1.02] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: 0.1 [-2.2] Greatest in 24 hrs: 0.1 ins. on the 12th WIND, mph Avg. uncorrected wind speed: 12.5 mph Avg. corrected wind speed: 12.9 mph Prevailing wind direction: W [16%] Peak gust and direction: 67 S on the 1st SUNSHINE: Campbell-Stokes card minutes: N/A Astronomical total minutes: N/A Today's Observations: 7 A.M. Weather: Broken cirrostratus, thin overcast cirrus Temperature: 26F; Dew Point: 17F; Wind: SW at 8 kts Sea-level pressure: 29.52 ins. Hg, rising, then more rapidly Visibility: 60 miles 6-hr Max temp: 26F 6-hr Min temp: 22F 24-hr Precip: 0.26 ins. 24-hr Snowfall: 3.1 ins. BHO SA 1155 E200 BKN 250 –OVC 60 998/26/17/2308/952/ VIRGA DSNT SW NEW SNOW PAST 24 HRS 3.1 INS/ 8/007 53010 4/007 70026 10026 20022 10 A.M. Weather: Scattered cirrostratus, overcast dense cirrus Temperature: 30F; Dew Point: 23F; Wind: WSW at 8 kts Sea-level pressure: 29.53 ins. Hg, steady, then rising Visibility: 40 miles, hazy 3-hr Precip: 0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E200 SCT 250 OVC 40 001/30/23/2408/953/ FEW BINOVC NW VIRGA DSNT S THN K LYR N-NE HAZY/ 8/002 53003 1 P.M. Weather: Overcast stratocumulus Temperature: 33F; Dew Point: 30F; Wind: SW at 6 kts Sea-level pressure: 29.48 ins. Hg, falling, then more rapidly Visibility: 30 miles, hazy 6-hr Max temp: 33F 6-hr Min temp: 25F 6-hr Precip: 0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E55 OVC 30 983/33/30/2306/948/ FEW BINOVC SW AND NNW THN K LYR N-NW-NE HAZY WND LGT/ 8/5// 58018 4/007 10033 20025 SUMMARY FOR TUESDAY, DECEMBER 3, 2019 TEMPERATURE (DEGREES F) MAX.....30 NORMAL.....44 MIN.....23 NORMAL.....28 MEAN....27 NORMAL.....36 DEPARTURE FROM 30-YEAR NORMAL..................... -9 TOTAL DEPARTURE FOR THE MONTH.....................-27 [-9.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............38 DEPARTURE........+9 TOTAL HEATING UNITS FOR THE MONTH..............113 DEPARTURE.......+26 TOTAL HEATING UNITS FOR THE SEASON............1350 DEPARTURE........+2 TOTAL HEATING UNITS LAST SEASON TO DATE.......1389 DEPARTURE.......-39 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................32 N AT 2:39 A.M. AERO.........................35 N AT 2:33 A.M. ASOS.........................37 N AT 3:08 A.M. DAVIS........................35 NNE AT 1:37 A.M. RMY N/a FASTEST MILE FOR YESTERDAY......................25 N AT 4:56 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................25 N AT 3:38 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................24 N AT 1:51 A.M. AVERAGE WIND SPEED AND DIRECTION..............16.2 WNW ASOS.......................15.1 DAVIS......................15.6 NW [326 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.26 DEPARTURE......+0.10 ASOS..............0.31 TOTAL PRECIPITATION FOR THE MONTH..........2.43 DEPARTURE......+1.95 ASOS..............2.57 TOTAL PRECIPITATION FOR THE YEAR..........51.51 DEPARTURE......+2.49 ASOS.............51.97 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........3.1 DEPARTURE.......+2.8 TOTAL SNOWFALL FOR THE MONTH...............13.1 DEPARTURE......+12.3 TOTAL SNOWFALL FOR THE SEASON..............13.2 DEPARTURE.......+9.8 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 67/35/51/+5/0.12/0.0/534/86 67 S AERO M M RMY N/A 11/02 50/31/41/-5/0.00/0.0/612/99 17 WNW AERO 14 W RMY N/A 11/03 53/35/44/-2/0.00/0.0/567/92 25 WSW AERO 23 W RMY 26 11/04 53/33/43/-2/0.00/0.0/546/89 24 S AERO 20 S RMY 24 11/05 54/44/49/+4/0.33/0.0/000/00 22 S AERO 18 WNW RMY 28 11/06 51/36/44/-1/0.00/0.0/596/98 28 WSW AERO 23 W RMY 27 11/07 55/38/47/+2/0.27/0.0/000/00 30 S AERO 26 SSW RMY 32 11/08 38/23/31/-13/0.00/0.0/555/92 38 NW AERO 37 WNW RMY 44 11/09 39/20/30/-14/0.00/0.0/583/97 22 S AERO 18 S RMY N/A 11/10 51/30/41/-3/0.00/0.0/174/29 30 SW AERO 30 SW RMY 31 11/11 52/39/46/+3/T/0.0/000/00 23 NE AERO 22 NE RMY 23 11/12 42/20/31/-12/0.08/0.1/000/00 37 WNW AERO 37 WNW RMY 41 11/13 28/15/22/-21/0.00/0.0/592/100 32 WNW AERO 32 WNW RMY 35 11/14 36/17/28/-14/0.00/0.0/136/23 18 SW AERO 17 SW RMY 20 11/15 51/32/42/0/0.00/0.0/553/94 25 WNW AERO 25 WNW RMY N/A 11/16 35/22/29/-13/0.00/0.0/580/99 35 NNW AERO 35 NNW RMY N/A 11/17 40/21/31/-10/T/T/.../.. 28 ENE AERO 27 ENE RMY 29 11/18 36/32/34/-7/..../0.0/.../.. 28 NNE AERO 29 N RMY 31 11/19 42/36/39/-2/..../0.0/.../.. 12 SSW AERO 9 NNW RMY N/A 11/20 38/33/36/-4/..../T/.../.. 20 NW AERO 18 NW RMY 21 11/21 46/30/38/-2/0.00/0.0/.../.. 21 NW AERO 21 NW RMY N/A 11/22 52/32/42/+2/0.12/0.0/.../.. 46 W AERO 47 W RMY 47 11/23 44/27/36/-3/0.00/0.0/.../.. 29 WNW AERO 29 WNW RMY N/A 11/24 44/35/40/+1/1.49/0.0/.../.. 45 N AERO 44 NE RMY 46 TSTM 11/25 50/34/42/+3/0.00/0.0/.../.. 32 WNW AERO 35 WNW RMY 23 11/26 59/39/49/+11/0.00/0.0/.../.. 28 SSW AERO 27 SSW RMY 29 11/27 50/42/46/+8/..../0.0/.../.. 30 W AERO 32 W RMY N/A TSTM 11/28 48/30/39/+1/..../T/.../.. 42 NW AERO 44 NW RMY 44 11/29 39/27/33/-4/0.00/0.0/.../.. 35 NW AERO 36 NW RMY 39 11/30 35/22/29/-8/0.00/0.0/.../.. 30 NW AERO 28 WNW RMY 31 DAILY RECORDS FOR NOVEMBER 11/13/19: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F, BREAKS PREVIOUS RECORD OF 30F SET IN 1920. It was also the third earliest maximum temperature colder than 30F on record, behind only 28F on 11/8/1894 and 29F on 11/12/1894. 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 32/16/24/-13/..../5.8/.../.. 33 ENE AERO 32 ENE RMY N/A 12/02 37/25/31/-5/..../2.7/.../.. 52 NE AERO 47 NE RMY 53 12/03 30/23/27/-9/..../4.6/.../.. 32 N AERO 35 N RMY 36 12/04 The low since midnight is 22F, daily normal minimum is 28F DAILY RECORDS FOR DECEMBER 12/01/19: DAILY RECORD SNOWFALL OF 5.8 INS., BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902. 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: Matt Douglas