BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, MARCH 16, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME PLENTY OF SUNSHINE AND EXCELLENT VISIBILITY, BUT COLD TODAY.... Other than some scattered stratocumulus and varying amounts of high thin cirrus today, there has been an abundance of sunshine. Visibility has been 80 miles all day, an indication of very clear air. Despite all the sun today, temperatures have not made it past the mid 30s. Definitely feels cold after the recent mild conditions. An onshore flow, which occasionally gets gusty into the 15-20mph range, just adds to the chill. The high so far today is 35F, this is 9 degrees below the normal high of 44F. The low since midnight is 22F, this is 4 degrees below the normal low of 26F. 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: Thin broken cirrus, few stratocumulus distant NE-SE Temperature: 25F; Dew Point: 10F; Relative Humidity: 53% Wind: NNE at 5 kts Sea-level pressure: 30.65 ins. Hg: rising unsteadily Visibility: 80 miles 6-hr Max temp: 27F 6-hr Min temp: 22F 24-hr Precip: 0.00 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 E300 –BKN 80 379/25/10/0205/065/ FEW SC DSNT NE-SE/ 8/501 52016 10027 20022 10 A.M. Weather: Scattered stratocumulus, thin scattered cirrus Temperature: 33F; Dew Point: 16F; Relative Humidity: 49% Wind: NE at 10G18 kts Sea-level pressure: 30.66 ins. Hg: rising, then falling Visibility: 80 miles 3-hr Precip: 0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 35 SCT 250 –SCT 80 384/33/16/0510G18/066/ 8/501 50005 1 P.M. Weather: Scattered stratocumulus, thin broken cirrus Temperature: 35F; Dew Point: 15F; Relative Humidity: 43% Wind: ENE at 7 kts Sea-level pressure: 30.64 ins. Hg: falling, then more rapidly Visibility: 80 miles 6-hr Max temp: 35F 6-hr Min temp: 25F 6-hr Precip: 0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 30 SCT E250 –BKN 80 375/35/15/0707/064/ 8/501 58009 10035 20025 SUMMARY FOR SUNDAY, MARCH 15, 2020 TEMPERATURE (DEGREES F) MAX.....47 NORMAL.....44 MIN.....28 NORMAL.....26 MEAN....38 NORMAL.....35 DEPARTURE FROM 30-YEAR NORMAL...................+3 TOTAL DEPARTURE FOR THE MONTH..................+154 [+10.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............27 DEPARTURE....... -3 TOTAL HEATING UNITS FOR THE MONTH..............327 DEPARTURE......-154 TOTAL HEATING UNITS FOR THE SEASON............4467 DEPARTURE......-582 TOTAL HEATING UNITS LAST SEASON TO DATE.......5003 DEPARTURE......-536 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................28 NW AT 2:16 A.M. AERO.........................28 NW AT 2:15 A.M. ASOS.........................27 NW AT 2:15 A.M. DAVIS........................26 NNW AT 2:14 A.M. RMY N/A FASTEST MILE FOR YESTERDAY......................19 NW AT 2:19 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................20 NW AT 2:20 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................20 NW AT 2:20 A.M. AVERAGE WIND SPEED AND DIRECTION.............. 9.6 NNW ASOS.......................10.5 DAVIS...................... 9.8 NNW [341 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE......-0.18 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.37 DEPARTURE......-2.22 ASOS..............0.46 TOTAL PRECIPITATION FOR THE YEAR...........5.03 DEPARTURE......-5.98 ASOS..............5.37 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.......-0.4 TOTAL SNOWFALL FOR THE MONTH................0.8 DEPARTURE.......-6.5 TOTAL SNOWFALL FOR THE SEASON..............25.6 DEPARTURE......-28.7 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 The low since midnight is 22F, daily normal minimum is 26F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MARCH 16 HIGH 73 IN 1990 LOW 8 IN 1932 PRE 1.95 INS. IN 1900 SNOW 10.0 INS. IN 1896 WIND 79 MPH NE IN 1956 RECORDS FOR MARCH 17 HIGH 69 IN 2003 LOW 6 IN 1885 PRECIP 1.97 INS. IN 1968 SNOWFALL 6.5 INS. IN 1956 PEAK GUST 70 MPH SSW IN 1973 TODAY'S REPORT PREPARED BY: Matt Douglas