BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, NOVEMBER 13, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME VERY COLD FOLLOWING LAST NIGHT'S SNOW.... Weather conditions have been almost clear and dry, with dew points in the single digits. Visibility was 85 miles all day. Snowfall yesterday amounted to a 1/10th inch, with 0.08 inches of liquid precipitation. Wind has been significant today, frequently gusting over 30 mph. Considering the strong cold air advection from the west, temperatures are well below normal. The high so far today is 28F, which is on track to set a new low maximum record. This will replace the last record of 30F in 1920! The low since midnight is 15F, which is one degree above the record of 14F, set in 1920. A very cold day indeed. PRELIMINARY STATS FOR OCTOBER 2019 TEMPERATURE, Deg. F Avg. Max. 60.5 [+0.2] Avg. Min. 46.7 [+3.8] Mean 53.6 [+2.0] 24-hour corrected mean: 53.3 Max. for month: 77F on the 7th Min. for month: 35F on the 5th HEATING DEGREE DAYS Total heating units: 347 [-74] Total for the season: 440 [-123] Total for last season: 543 PRECIPITATION, Inches Total: 6.92 [+2.23] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 12.2 mph Avg. corrected wind speed: 12.6 mph Prevailing wind direction: NE [13%] Peak gust and direction: 61 S,E on the 17th, 31st SUNSHINE: Campbell-Stokes card minutes: 7074 minutes of possible 19824 or 36% Astronomical total minutes: 7330 minutes of possible 20566 or 36% This was the second cloudiest October on record! BHO Lowest October Sunshine, hours (1886-2019): 1) 80.5 in 1913 [24%] 2) 117.9 in 2019 [36%] 3) 120.3 in 1896 [36%] 4) 121.6 in 1919 [37%] 5) 124.9 in 1888 [38%] Today's Observations: 7 A.M. Weather: Clear, few distant cumulus/ altocumulus offshore Temperature: 15F; Dew Point: 1F; Wind: WNW at 18G26 kts, Peak Wind: 30 MPH (26 kts) WNW at 6:55 A.M. Sea-level pressure: 30.26 ins. Hg, rising, then more rapidly Visibility: 85 miles 6-hr Max temp: 19F 6-hr Min temp: 15F 24-hr Precip: 0.08 ins. 24-hr Snowfall: 0.1 ins. BHO SA 1155 CLR 85 247/15/1/2918G26/026/ FEW DSNT CU/SC OFFSHR PK WND 2926/55/ 8/800 70008 51027 10019 20015 10 A.M. Weather: Clear, few distant cumulus offshore Temperature: 22F; Dew Point: 3F; Wind: WNW at 18G26 kts, Peak wind: 30 MPH (26 kts) WNW at 9:20 A.M. Sea-level pressure: 30.34 ins. Hg, falling then rising Visibility: 85 miles 3-hr Precip: 0.00 ins. BHO SA 1455 CLR 85 275/22/3/3018G26/034/ FEW DSNT CU OFFSHR PK WND 3026/20/ 8/100 51028 1 P.M. Weather: Clear, few distant cumulus offshore Temperature: 27F; Dew Point: 6F; Wind: WNW at 15, gusting to 25 kts Sea-level pressure: 30.35 ins. Hg, rising steadily Peak wind: 32 MPH (28 kts) at 11:39 A.M. Visibility: 85 miles 6-hr Max temp: 28F 6-hr Min temp: 15F 6-hr Precip: 0.00 ins. BHO SA 1755 CLR 85 279/27/6/3015G25/035/ FEW DSNT CU OFFSHR PK WND 3028/1639/ 8/100 53004 10028 20015 SUMMARY FOR TUESDAY, NOVEMBER 12, 2019 TEMPERATURE (DEGREES F) MAX.....42 NORMAL.....51 MIN.....20 NORMAL.....35 MEAN....31 NORMAL.....43 DEPARTURE FROM 30-YEAR NORMAL...................-12 TOTAL DEPARTURE FOR THE MONTH...................-38 [-3.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............34 DEPARTURE........+12 TOTAL HEATING UNITS FOR THE MONTH..............282 DEPARTURE........+38 TOTAL HEATING UNITS FOR THE SEASON.............722 DEPARTURE........-85 TOTAL HEATING UNITS LAST SEASON TO DATE........757 DEPARTURE........-35 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................37 WNW AT 11:07 P.M. AERO.........................37 WNW AT 9:55 P.M ASOS.........................40 NW AT 11:10 P.M. DAVIS........................42 W AT 11:09 P.M. RMY 41 FASTEST MILE FOR YESTERDAY......................28 WNW AT 8:52 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................26 NW AT 9:10 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................29 WNW AT 8:08 P.M. AVERAGE WIND SPEED AND DIRECTION................12.1 WNW ASOS.........................12.0 DAVIS........................12.5 NW [310 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.08 DEPARTURE......-0.08 ASOS..............0.10 TOTAL PRECIPITATION FOR THE MONTH..........0.72 DEPARTURE......-1.00 ASOS..............0.74 TOTAL PRECIPITATION FOR THE YEAR..........46.06 DEPARTURE......+0.56 ASOS.............46.21 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.1 DEPARTURE.......+0.1 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.......-0.4 TOTAL SNOWFALL FOR THE SEASON...............0.1 DEPARTURE.......-0.9 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 67/52/60/+3/0.06/028/04 28 SW AERO 25 SSW RMY 29 10/02 74/49/62/+5/0.42/021/03 30 ENE AERO 25 ENE RMY 28 10/03 51/46/49/-7/..../000/00 28 ENE AERO 26 ENE RMY N/A 10/04 59/40/50/-6/..../397/57 38 NNW AERO 38 NNW RMY 38 10/05 58/35/47/-9/0.00/687/99 21 N AERO 18 SSW RMY N/A 10/06 65/44/55/0/0.00/263/38 36 SSW AERO 35 SSW RMY N/A 10/07 77/57/67/+12/0.12/316/46 47 SSW AERO 46 SSW RMY 49 10/08 60/52/56/+2/T/000/00 22 NE AERO 18 NW RMY N/A 10/09 55/49/52/-2/..../000/00 43 NE AERO 37 NE RMY 44 10/10 54/47/51/-3/..../000/00 41 NE AERO 37 NE RMY 42 10/11 52/48/50/-3/..../000/00 41 NE AERO 39 NE RMY 41 10/12 52/49/51/-2/..../000/00 39 NE AERO 37 NE RMY N/A 10/13 66/48/57/+4/..../570/85 18 WNW AERO 17 WNW RMY 18 10/14 67/51/59/+7/..../335/50 18 WSW AERO 17 WSW RMY N/A 10/15 61/43/52/0/..../653/98 18 NNW AERO 17 NNW RMY N/A 10/16 61/45/53/+2/..../305/46 58 ESE AERO 58 ESE RMY N/A 10/17 60/46/53/+2/..../086/13 61 E AERO 63 E RMY N/A 10/18 57/41/49/-2/..../099/15 29 WNW AERO 32 W RMY 32 10/19 58/36/47/-3/..../648/99 18 NW AERO 18 NW RMY 19 10/20 60/43/52/+2/T/280/43 14 NE AERO 16 NE RMY N/A 10/21 59/49/54/+4/0.01/591/91 25 E AERO 21 NE RMY 23 10/22 58/47/53/+4/..../078/12 29 E AERO 28 E RMY 23 10/23 65/48/57/+8/..../431/67 35 W AERO 35 W RMY 36 10/24 67/43/55/+6/.../635/99 28 SSW AERO 28 SSW RMY 29 10/25 64/47/56/+7/.../217/34 20 WSW AERO 21 SW RMY N/A 10/26 58/45/52/+4/.../502/79 20 N AERO 18 N RMY N/A 10/27 52/45/49/+1/1.43/000/00 37 ESE AERO 35 ESE RMY 37 10/28 53/46/50/+2/.../050/08 24 NNW AERO 24 NNW RMY N/A 10/29 54/47/51/+4/..../000/00 15 ESE AERO 15 ESE RMY 14 10/30 65/51/58/+11/..../138/22 24 S AERO M M RMY N/A 10/31 68/58/63/+16/..../000/00 61 S AERO M M RMY N/A 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/..../0.0/.../.. 67 S AERO M M RMY N/A 11/02 50/31/41/-5/0.00/0.0/.../.. 17 WNW AERO 14 W RMY N/A 11/03 53/35/44/-2/0.00/0.0/.../.. 25 WSW AERO 23 W RMY 26 11/04 53/33/43/-2/0.00/0.0/.../.. 24 S AERO 20 S RMY 24 11/05 54/44/49/+4/0.33/0.0/.../.. 22 S AERO 18 WNW RMY 28 11/06 51/36/44/-1/0.00/0.0/.../.. 28 WSW AERO 23 W RMY 27 11/07 55/38/47/+2/0.27/0.0/.../.. 30 S AERO 26 SSW RMY 32 11/08 38/23/31/-13/0.00/0.0/.../.. 38 NW AERO 37 WNW RMY 44 11/09 39/20/30/-14/0.00/0.0/.../.. 22 S AERO 18 S RMY N/A 11/10 51/30/41/-3/0.00/0.0/.../.. 30 SW AERO 30 SW RMY 31 11/11 52/39/46/+3/T/0.0/.../.. 23 NE AERO 22 NE RMY 23 11/12 42/20/31/-12/0.08/0.1/.../.. 37 WNW AERO 37 WNW RMY 41 11/13 The low since midnight is 15F, daily normal minimum is 34F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 13 HIGH 66 IN 1931, 1964 LOW 14 IN 1920 PRECIP 1.96 INCHES IN 1982 SNOWFALL 4.6 IN 2004 PEAK GUST 77 S IN 1982 RECORDS FOR NOVEMBER 14 HIGH 70 IN 1993 LOW 11 IN 1905 PRECIP 2.08 INCHES IN 2009 SNOWFALL 3.5 IN 1997, 2014 PEAK GUST 63 W IN 2003 TODAY'S REPORT PREPARED BY: Benjamin Turner and Greg White