BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MARCH 14, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME OVERCAST AND MILD WITH LIGHT WINDS ATOP GREAT BLUE HILL.... Wind remained light and variable today, with a max gust of only 12 mph occurring this afternoon. Visibility was hindered by a distant smoke layer, with only 45 miles being seen. Snow depth remained at 3 ins. since this morning, due in part to the overcast skies. Despite the cloud cover, the temperature rose from 35F this morning to a maximum so far today of 48F. That is 4 degrees above the daily normal maximum of 44F. The low since midnight is 32F, 6 degrees above the normal minimum of 26F. PRELIMINARY STATS FOR FEBRUARY 2019 TEMPERATURE, Deg. F Avg. Max. 37.3 [+0.5] Avg. Min. 21.6 [+2.5] Mean 29.5 [+1.6] 24-hour corrected mean: 29.2 Max. for month: 62F on the 5th Min. for month: 5F on the 1st HEATING DEGREE DAYS Total heating units: 990 [-47] Total for the season: 4486 [-82] Total for last season: 4122 PRECIPITATION, Inches Total: 3.61 [-0.46] Greatest in 24 hrs: 1.14 ins. on the 12th-13th SNOWFALL, Inches Total: 12.1 [-1.8] Greatest in 24 hrs: 4.7 ins. on the 17th-18th WIND, mph Avg. uncorrected wind speed: 12.9 Avg. corrected wind speed: 13.3 Prevailing wind direction: WNW at 22% Peak gust and direction: 66 W on 25th SUNSHINE: Campbell-Stokes card minutes: 9132 minutes of possible 17148 or 53% Astronomical total minutes: 9476 minutes of possible 17766 or 53% Today's Observations: 7 A.M. Weather: Overcast stratus Temperature: 35F; Dew Point: 31F; Wind: S at 4 kts, Wind: Light and variable Sea-level pressure: 30.31 ins. Hg, rising steadily Visibility: 35 miles, distant smoke layer 6-hr Max temp: 35F 6-hr Min temp: 32F 24-hr Precip: 0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 3 ins. BHO SA 1155 E60 OVC 35 263/35/31/1904/031/ K LYR ALG HRZN WND L/V/ 8/6// 4/003 51009 10035 20032 10 A.M. Weather: Broken altocumulus Temperature: 44F; Dew Point: 30F; Wind: S at 4 kts, Wind: Light and variable Sea-level pressure: 30.29 ins. Hg, falling steadily Visibility: 40 miles, distant smoke layer 3-hr Precip: 0.00 ins. BHO SA 1455 E65 BKN 40 258/44/30/1804/029/ K LYR ALG HRZN WND L/V/ 8/030 58005 1 P.M. Weather: Overcast stratocumulus Temperature: 47F; Dew Point: 23F; Wind: S at 10G12 kts Sea-level pressure: 30.24 ins. Hg, falling steadily Visibility: 45 miles, thin smoke layer in all directions 6-hr Max temp: 48F 6-hr Min temp: 35F 6-hr Precip: 0.00 ins. 6-hr snowfall: 0.0 ins. Snow depth: 3 ins. BHO SA 1755 E50 BKN 45 242/47/23/1910G12/024/ THN K LYR ALQDS/ 8/4// 4/003 58016 10048 20035 SUMMARY FOR WEDNESDAY, MARCH 13, 2019 TEMPERATURE (DEGREES F) MAX.....43 NORMAL.....43 MIN.....24 NORMAL.....26 MEAN....34 NORMAL.....34 DEPARTURE FROM 30-YEAR NORMAL..........................0 TOTAL DEPARTURE FOR THE MONTH........................-56 [-4.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............31 DEPARTURE..........0 TOTAL HEATING UNITS FOR THE MONTH.............477 DEPARTURE........+57 TOTAL HEATING UNITS FOR THE SEASON...........4963 DEPARTURE........-25 TOTAL HEATING UNITS LAST SEASON TO DATE......4517 DIFFERENCE......+446 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................18 W AT 8:41 P.M. AERO.........................21 W AT 8:40 P.M. ASOS.........................23 SW AT 8:43 P.M. DAVIS........................23 S AT 8:14 P.M. RMY 23 FASTEST MILE FOR YESTERDAY......................16 W AT 8:43 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................17 SW AT 8:43 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 S AT 8:23 P.M. AVERAGE WIND SPEED AND DIRECTION..............7.3 NNE ASOS.......................8.1 DAVIS......................7.7 SW [218 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..........2.85 DEPARTURE.......+0.61 ASOS..............2.91 TOTAL PRECIPITATION FOR THE YEAR..........11.79 DEPARTURE.......+1.13 ASOS.............11.96 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE........-0.5 TOTAL SNOWFALL FOR THE MONTH...............21.0 DEPARTURE.......+14.5 TOTAL SNOWFALL FOR THE SEASON..............45.5 DEPARTURE........-8.0 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 19/5/12/-14/0.00/0.0/552/95 29 W AERO 28 W RMY N/A 02/02 30/7/19/-7/0.00/0.0/318/55 32 WSW AERO 32 WSW RMY 31 02/03 38/27/33/+7/0.00/0.0/126/22 26 S AERO 25 S RMY N/A 02/04 59/33/46/+20/0.00/0.0/540/93 25 SSW AERO 28 SSW RMY N/A 02/05 62/39/51/+25/0.00/0.0/354/60 30 WNW AERO 29 WNW RMY 32 02/06 39/28/34/+8/0.35/T/396/67 24 NNW AERO 23 NNW RMY N/A 02/07 37/31/34/+7/0.35/0.0/000/00 28 ENE AERO 24 ENE RMY 28 02/08 51/27/39/+12/0.07/0.0/204/34 46 W AERO 46 WNW RMY 51 02/09 32/20/26/-1/0.00/0.0/594/100 50 WNW AERO 52 WNW RMY 52 02/10 33/18/26/-1/0.00/0.0/510/85 24 WNW AERO 23 WNW RMY 25 02/11 34/21/28/+1/0.00/0.0/318/53 24 NNW AERO 23 NNW RMY 25 02/12 33/13/23/-4/0.90/2.8/000/00 32 E AERO 30 E RMY 26 02/13 39/29/34/+6/0.26/0.1/018/03 36 W AERO 32 W RMY 36 02/14 37/26/32/+4/0.00/0.0/594/97 44 WNW AERO 42 WNW RMY 45 02/15 49/29/39/+11/0.11/0.0/060/10 40 S AERO 40 S RMY 44 02/16 44/26/35/+7/0.00/0.0/504/82 25 NW AERO 25 NW RMY N/A 02/17 37/19/28/0/0.01/T/618/100 30 NNW AERO 25 NNW RMY N/A 02/18 30/16/23/-6/0.41/4.7/000/00 35 NW AERO 36 NW RMY 41 02/19 30/10/20/-9/0.00/0.0/618/99 35 NW AERO 33 NW RMY N/A 02/20 26/12/19/-10/0.12/0.3/000/00 16 WNW AERO 14 SSW RMY N/A 02/21 43/21/32/+3/0.33/0.7/294/47 36 W AERO 33 W RMY 38 02/22 43/30/37/+8/0.00/0.0/504/80 22 NW AERO 21 NW RMY 23 02/23 38/24/31/+1/0.00/0.0/336/53 18 NNW AERO 16 NNW RMY N/A 02/24 45/30/38/+8/0.40/0.0/000/00 41 W AERO 37 W RMY 47 02/25 37/25/31/+1/0.03/T/336/57 66 W AERO 59 W RMY M 02/26 29/14/22/-8/0.00/0.0/642/100 46 WNW AERO 39 WNW RMY 47 02/27 22/9/16/-15/0.10/1.2/180/28 35 WNW AERO 26 WNW RMY N/A 02/28 28/15/22/-9/0.17/2.3/486/75 22 NW AERO 18 NW RMY 22 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 38/17/28/-3/..../.../.../.. 16 NNW AERO 13 NNW RMY 22 03/02 31/27/29/-2/..../.../.../.. 29 NNE AERO 22 NNE RMY 30 03/03 40/25/33/+1/..../.../.../.. 21 ESE AERO 14 ESE RMY N/A 03/04 35/18/27/-5/..../.../.../.. 33 W AERO 18 W RMY 32 03/05 29/10/20/-12/0.00/0.0/.../.. 28 WNW AERO 12 SW RMY N/A 03/06 24/10/17/-15/0.00/0.0/.../.. 40 WNW AERO 25 WNW RMY 41 03/07 26/6/16/-17/0.00/0.0/.../.. 35 W AERO 18 W RMY 34 03/08 35/11/23/-10/0.00/0.0/.../.. 23 WSW AERO M M RMY M 03/09 43/22/33/0/0.00/0.0/.../.. 20 WSW AERO M M RMY N/A 03/10 40/26/33/0/..../.../.../.. 32 ESE AERO 23 S RMY 32 03/11 48/33/41/+7/..../.../.../.. 40 NW AERO 37 NNW RMY 41 03/12 41/27/34/0/..../.../.../.. 32 N AERO 33 N RMY 34 03/13 43/24/34/0/..../.../.../.. 18 W AERO 21 W RMY 23 03/14 Low temp since midnight is 32F; normal low is 26F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MARCH 14 HIGH 74 IN 1946 LOW 8 IN 1926 PRECIP 4.95 INS. IN 2010 SNOWFALL 7.3 INS. IN 2017 PEAK GUST 67 MPH ENE IN 2010 RECORDS FOR MARCH 15 HIGH 80 IN 1990 LOW 6 IN 1993 PRE 2.86 INS. IN 2010 SNOW 12.0 INS. 1967 WIND 73e MPH ESE IN 1940 TODAY'S REPORT PREPARED BY: Benjamin Turner