BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, MARCH 18, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME A CHILLY START, WITH ABUNDANT SUNSHINE AND GREAT VISIBILITY.... We observed fair weather with very little in the way of clouds until after the 1 P.M. observation. Skies are now mostly covered with a translucent layer of cirrostratus. Visibility was 80 miles for most of the day, slightly decreasing with the increase in cloud cover. Conditions were dry, reaching 20% humidity by 3 P.M. Wind was light, shifting from WNW to SE as the day went on. The high so far today is 50F, this is 6 degrees above the normal high of 44F. The low since midnight is 31F, this is 4 degrees above the normal low of 27F. PRELIMINARY STATS FOR FEBRUARY 2020 TEMPERATURE, Deg. F Avg. Max. 40.7 [+3.9] Avg. Min. 25.9 [+6.7] Mean 33.3 [+5.4] 24-hour corrected mean: 33.0 Max. for month: 60F on the 24th Min. for month: 4F on the 15th HEATING DEGREE DAYS Total heating units: 911 [-164] Total for the season: 4140 [-345] Total for last season: 4485 PRECIPITATION, Inches Total: 3.20 [-0.87] Greatest in 24 hrs: 0.74 on the 26th-27th SNOWFALL, Inches Total: 0.6 [-13.3] Greatest in 24 hrs: 0.5 ins. on the 13th WIND, mph Avg. uncorrected wind speed: 11.5 mph Avg. corrected wind speed: 12.0 mph Prevailing wind direction: W [24%] Peak gust and direction: 71 WSW on the 7th SUNSHINE: Campbell-Stokes card minutes: 7596 minutes of possible 17796 or 43% Astronomical total minutes: 7853 minutes of possible 18422 or 43% Today's Observations: 7 A.M. Weather: Few cirrostratus Temperature: 32F; Dew Point: 22F; Relative Humidity: 65% Wind: WNW at 7 kts Sea-level pressure: 30.42 ins. Hg: rising steadily Visibility: 80 miles 6-hr Max temp: 37F 6-hr Min temp: 31F 24-hr Precip: 0.03 ins. 24-hr Snowfall: 0.1 ins. BHO SA 1155 CLR 80 300/32/22/3007/042/ FEW CS ALQDS NEW SNOW PAST 24 HOURS 0.1 INS/ 8/500 51033 10037 20031 10 A.M. Weather: Few cirrostratus Temperature: 44F; Dew Point: 20F; Relative Humidity: 39% Wind: W at 4 kts, light and variable Sea-level pressure: 30.50 ins. Hg: rising steadily Visibility: 80 miles 3-hr Precip: 0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 CLR 80 327/44/20/2804/050/ FEW CS ALQDS WND L/V/ 8/500 53027 1 P.M. Weather: Few cirrostratus Temperature: 50F; Dew Point: 18F; Relative Humidity: 27% Wind: SW at 4 kts, light and variable Sea-level pressure: 30.47 ins. Hg: falling, then more slowly Visibility: 80 miles 6-hr Max temp: 50F 6-hr Min temp: 32F 6-hr Precip: 0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 CLR 80 318/50/18/2304/047/ FEW CS ALQDS WND L/V/ 8/500 58009 10050 20032 SUMMARY FOR TUESDAY, MARCH 17, 2020 TEMPERATURE (DEGREES F) MAX.....43 NORMAL.....44 MIN.....28 NORMAL.....27 MEAN....36 NORMAL.....36 DEPARTURE FROM 30-YEAR NORMAL...................0 TOTAL DEPARTURE FOR THE MONTH..................+148 [+8.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............29 DEPARTURE.........0 TOTAL HEATING UNITS FOR THE MONTH..............392 DEPARTURE......-148 TOTAL HEATING UNITS FOR THE SEASON............4532 DEPARTURE......-576 TOTAL HEATING UNITS LAST SEASON TO DATE.......5059 DEPARTURE......-527 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................29 W AT 9:11 P.M. AERO.........................30 W AT 9:33 P.M. ASOS.........................28 W AT 9:10 P.M. DAVIS........................30 W AT 9:10 P.M. RMY 29 FASTEST MILE FOR YESTERDAY......................22 W AT 9:04 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................21 W AT 9:10 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................22 W AT 9:04 P.M. AVERAGE WIND SPEED AND DIRECTION..............10.5 W ASOS.......................10.0 DAVIS......................10.8 S [190 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03 DEPARTURE......-0.15 ASOS..............0.05 TOTAL PRECIPITATION FOR THE MONTH..........0.43 DEPARTURE......-2.52 ASOS..............0.53 TOTAL PRECIPITATION FOR THE YEAR...........5.09 DEPARTURE......-6.28 ASOS..............5.44 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.1 DEPARTURE.......-0.3 TOTAL SNOWFALL FOR THE MONTH................1.2 DEPARTURE.......-6.9 TOTAL SNOWFALL FOR THE SEASON..............26.0 DEPARTURE......-29.1 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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 02/01 38/30/34/+8/0.01/T/000/00 14 WSW AERO 14 WSW RMY N/A 02/02 40/30/35/+9/0.00/0.0/078/13 18 W AERO 18 WNW RMY 18 02/03 44/27/36/+10/0.00/0.0/260/43 28 W AERO 28 W RMY 28 02/04 44/33/39/+13/T/0.0/055/09 19 E AERO 16 E RMY 18 02/05 41/30/36/+10/0.08/T/000/00 20 NNW AERO 19 NNW RMY N/A 02/06 31/30/34/+8/0.56/0.1/000/00 29 E AERO 28 E RMY 27 02/07 53/25/39/+12/0.29/0.0/000/00 71 WSW AERO 71 SSW RMY 73 02/08 33/20/27/0/T/T/616/100 46 W AERO 44 W RMY 44 02/09 33/15/24/-3/T/T/303/49 30 SSE AERO 29 SSE RMY N/A 02/10 42/33/38/+11/0.16/T/000/00 39 SSW AERO 39 SSW RMY 39 02/11 40/36/38/+11/0.21/0.0/000/00 24 W AERO 23 W RMY N/A 02/12 41/30/36/+9/0.00/0.0/314/50 37 W AERO 36 W RMY N/A 02/13 35/31/34/+6/0.58/0.5/000/00 29 SSW AERO 29 SSW RMY N/A 02/14 33/8/21/-7/0.00/0.0/506/80 32 WNW AERO 32 NW RMY 34 02/15 27/4/16/-12/0.00/0.0/508/80 31 SSW AERO 31 SSW RMY N/A 02/16 40/23/32/+4/0.00/0.0/006/01 38 SW AERO 38 SW RMY N/A 02/17 44/28/36/+8/0.00/0.0/582/91 25 WNW AERO 24 WNW RMY 24 02/18 37/27/32/+3/0.31/T/000/00 26 SE AERO 26 SE RMY N/A 02/19 42/25/34/+5/0.00/0.0/530/82 45 W AERO 46 W RMY 44 02/20 31/18/25/-4/0.00/0.0/389/60 32 W AERO 32 W RMY N/A 02/21 30/11/21/-8/0.00/0.0/651/100 24 NNW AERO 21 N RMY N/A 02/22 44/23/34/+5/0.00/0.0/647/99 26 W AERO 24 W RMY 27 02/23 53/30/42/+12/0.00/0.0/636/97 21 SW AERO 22 WSW RMY 23 02/24 60/32/46/+16/0.00/0.0/606/92 29 S AERO 29 SSW RMY 31 02/25 53/40/47/+17/0.19/0.0/033/05 17 NE AERO 18 ENE RMY 17 02/26 45/39/42/+12/0.08/0.0/007/01 23 ENE AERO 24 E RMY N/A 02/27 49/27/38/+7/0.73/0.0/274/41 51 W AERO 53 W RMY 52 02/28 36/25/31/0/0.00/0.0/596/89 38 SW AERO 38 SW RMY 36 02/29 35/19/27/-4/0.00/0.0/256/38 32 W AERO 32 W RMY 34 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 03/01 33/15/24/-7/0.00/0.0/.../.. 28 WNW AERO 28 WNW RMY 27 03/02 52/24/38/+7/T/T/.../.. 40 S AERO 39 S RMY 41 03/03 64/45/55/+23/..../0.0/.../.. 30 S AERO 30 S RMY N/A 03/04 50/38/44/+12/..../0.0/.../.. 56 W AERO 56 W RMY 58 03/05 51/32/42/+10/0.00/0.0/.../.. 31 W AERO 31 NW RMY 32 03/06 47/30/39/+7/..../.../.../.. 46 NE AERO 45 NE RMY 46 03/07 43/26/35/+2/..../.../.../.. 42 N AERO 43 N RMY 44 03/08 53/26/40/+7/0.00/0.0/.../.. 31 W AERO 30 W RMY 28 03/09 72/40/56/+23/0.00/0.0/.../.. 32 SW AERO 32 SW RMY 31 03/10 68/49/59/+26/0.00/0.0/.../.. 48 WSW AERO 46 WSW RMY 49 03/11 56/37/47/+13/0.00/0.0/.../.. 31 WNW AERO M M RMY 21 03/12 46/31/39/+5/..../0.0/.../.. 21 SE AERO 18 SE RMY N/A 03/13 59/38/49/+15/..../0.0/.../.. 46 WNW AERO 44 WNW RMY 46 03/14 51/35/43/+8/0.00/0.0/.../.. 37 W AERO 36 W RMY 35 03/15 47/28/38/+3/0.00/0.0/.../.. 28 NW AERO 28 NW RMY N/A 03/16 36/22/29/-6/0.00/0.0/.../.. 21 NE AERO 21 ESE RMY 21 03/17 43/28/36/0/..../0.4/.../.. 29 W AERO 30 W RMY 29 03/18 The low since midnight is 31F, daily normal minimum is 27F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MARCH 18 HIGH 72 IN 2012 LOW 0 IN 1885 PRECIP 5.61 INS. IN 1968 [RECORD FOR MONTH] SNOWFALL 9.3 INS. IN 1985 PEAK GUST 71e MPH WNW IN 1941 RECORDS FOR MARCH 19 HIGH 77 IN 2012 LOW -2 IN 1967 PRECIP 1.69 INS. IN 1956 SNOWFALL 17.6 INS. IN 1956 [RECORD FOR MONTH] PEAK GUST 75e MPH WNW IN 1941 TODAY'S REPORT PREPARED BY: Benjamin Turner