BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, MAY 6, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0433E SUNSET: 1849E FAIR WEATHER DAY WITH A STILL-PREVALENT COOL BREEZE.... Yesterday we experienced more rainfall with an overnight total of 0.24 inches. Visibility was much better today, being 75 miles on average. Skies are partly cloudy with a cool northwesterly breeze. There are frequent gusts of 20 mph, with the highest one being 34 mph so far. The high so far today is 61F, this is 3 degrees below the normal high of 64F. The low since midnight is 45F, which is a degree above the daily normal low of 44F. Today's Observations: 7 A.M. Weather: Scattered stratocumulus Temperature: 49F; Dew Point: 46F; Relative Humidity: 90% Wind: WNW at 14G20 kts Sea-level pressure: 29.81 in Hg, rising steadily Visibility: 75 miles 6-hr Max temp: 49F 6-hr Min temp: 46F 24-hr Precip: 0.24 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0.0 ins. BHO SA 1155 50 SCT 75 095/49/46/3014G20/981/ 8/800 53019 70024 10049 20046 10 A.M. Weather: Broken stratocumulus Temperature: 55F; Dew Point: 36F; Relative Humidity: 148% Wind: WNW @ 13G24 kts Sea-level pressure: 29.85 in Hg; rising steadily Visibility: 75 miles 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 50 BKN 75 108/55/36/3013G24/985/ 8/800 51013 1 P.M. Weather: Clear, few cumulus Temperature: 60F, Dew point: 36F; Relative Humidity: 40% Wind: NW @ 14G22 kts, peak of 33 mph WNW at 12:14 P.M. Sea-level pressure: 29.85 in Hg; rising then steady Visibility: 75 miles 6-hr Max temp: 61F 6-hr Min temp: 49F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1755 CLR 75 109/60/36/3314G22/985/ FEW CU ALQDS PK WND 3028/14/ 8/100 53001 10061 20049 SUMMARY FOR WEDNESDAY, MAY 5, 2021 TEMPERATURE (DEGREES F) MAX.......48 NORMAL.....63 MIN.......44 NORMAL.....45 MEAN......46 NORMAL.....54 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL........ -8 TOTAL DEPARTURE FOR THE MONTH.....................-4 [-1.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL THRU JUN) TOTAL HEATING UNITS FOR YESTERDAY...............19 DEPARTURE.......+8 TOTAL HEATING UNITS FOR THE MONTH...............62 DEPARTURE.......+2 TOTAL HEATING UNITS FOR THE SEASON............5403 DEPARTURE.....-692 TOTAL HEATING UNITS LAST SEASON TO DATE.......5558 DEPARTURE.....-155 COOLING DEGREE DAYS (SEASON JAN THRU DEC) TOTAL COOLING UNITS FOR YESTERDAY............... 0 DEPARTURE....... 0 TOTAL COOLING UNITS FOR THE MONTH............... 0 DEPARTURE.......-1 TOTAL COOLING UNITS FOR THE SEASON.............. 0 DEPARTURE.......-3 TOTAL COOLING UNITS LAST SEASON TO DATE......... 2 DEPARTURE.......-2 PEAK WIND GUST (MPH): 420C/Official..............18 ESE @ 12:44 A.M. AEROVANE (south tower).....14 ESE @ 12:46 A.M. ASOS.......................16 NNE @ 2:01 P.M. DAVIS #1...................17 NNE @ 12:43 A.M. DAVIS #2 (south tower).....16 E @ 2:05 P.M. RMY........................17 @ 2:00 P.M. VECTOR.....................18 @ 1:59 P.M. MERLIN.....................N/A FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................11 NNE @ 2:02 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................12 N @ 6:54 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............12 ESE @ 12:43 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............12 NNW @ 1:59 P.M. MAXIMUM 2-MINUTE RMY AVERAGE....................12 SE @ 12:36 A.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................12 @ 12:37 A.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL...... 6.0 NE [144 total miles] ASOS..................... 5.7 DAVIS #1................. 6.2 NE DAVIS #2................. 6.1 NE RMY...................... 6.0 ENE VECTOR................... 6.4 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.24 DEPARTURE....+0.11 ASOS.............0.24 TOTAL PRECIPITATION FOR THE MONTH.............1.39 DEPARTURE....+0.77 ASOS.............1.35 TOTAL PRECIPITATION FOR THE YEAR.............16.45 DEPARTURE....-2.72 ASOS...........16.63 PRELIMINARY CLIMATE SUMMARY FOR APRIL 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 04/01 56/30/43/+2/0.89/T/000/00 44 NW AERO 51 NW RMY 49 04/02 37/24/31/-10/0.00/0.0/614/80 28 NW AERO 32 NNW RMY 30 04/03 48/23/36/-6/0.00/0.0/755/98 24 NW AERO 25 NW RMY 26 04/04 58/33/46/+4/0.00/0.0/734/95 38 NNW AERO 41 NNW RMY 41 04/05 57/41/49/+6/T/T/031/04 41 NNW AERO 48 NNW RMY 50 04/06 61/40/51/+8/0.00/0.0/412/53 26 NNW AERO 25 NNW RMY 31 04/07 57/41/49/+6/0.00/0.0/391/50 23 ENE AERO 21 ENE RMY 22 04/08 59/43/51/+7/0.00/0.0/745/95 22 ENE AERO 22 ENE RMY 24 04/09 69/42/56/+12/0.00/0.0/707/90 24 S AERO M M RMY 26 04/10 75/43/59/+14/0.00/0.0/576/73 26 SSW AERO 28 SSW RMY 30 04/11 53/40/47/+2/T/0.0/000/00 33 ENE AERO 33 ENE RMY 34 04/12 46/37/42/-3/0.05/0.0/000/00 36 ENE AERO 37 ENE RMY 41 04/13 56/37/47/+1/T/0.0/415/52 31 NE AERO 30 NE RMY 33 04/14 56/42/49/+3/0.00/0.0/729/91 22 ESE AERO 23 ESE RMY 22 04/15 51/37/44/-3/0.30/0.0/016/02 26 ESE AERO 25 ESE RMY 28 04/16 39/31/35/-12/2.22/3.6/000/00 48 NNW AERO 58 NNW RMY 58 04/17 45/34/40/-7/0.07/T/040/05 27 NNW AERO 30 NNW RMY 29 04/18 60/38/49/+1/0.00/0.0/666/82 28 NW AERO 28 NW RMY 31 04/19 66/44/55/+7/T/0.0/.../.. 22 SSW AERO 25 SSW RMY 28 04/20 72/45/59/+10/0.00/0.0/.../.. 38 SW AERO 37 WSW RMY 40 04/21 68/32/50/+1/0.48/*T/.../.. 45 S AERO 51 S RMY 51 TSTM 04/22 44/28/36/-13/T/T/.../.. 54 W AERO 55 W RMY 59 04/23 58/32/45/-5/0.00/0.0/.../.. 47 W AERO 48 W RMY 52 04/24 70/44/57/+7/0.00/0.0/.../.. 33 WNW AERO 37 WNW RMY 55 04/25 54/44/49/-1/0.20/0.0/.../.. 23 NNE AERO 20 SSW RMY 24 04/26 55/40/48/-3/0.00/0.0/.../.. 39 NW AERO 40 NW RMY 43 04/27 67/38/53/+2/T/0.0/.../.. 26 W AERO 28 WNW RMY 28 04/28 63/46/55/+3/0.18/0.0/.../.. 18 ENE AERO 21 WNW RMY 20 04/29 54/44/48/-4/0.42/0.0/.../.. 18 ENE AERO 20 NNE RMY 19 04/30 62/41/52/0/0.08/0.0/.../.. 58 WNW AERO 60 WNW RMY 65 *Trace of frozen on 04/21 was hail, 1/8" diameter, this does not count as snowfall. PRELIMINARY CLIMATE SUMMARY FOR MAY 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 05/01 62/38/50/-3/0.06/0.0/.../.. 31 WNW AERO 35 WNW RMY 40 05/02 76/48/62/+9/0.01/0.0/.../.. 41 SW AERO 41 SW RMY 46 05/03 67/48/58/+5/0.07/0.0/.../.. 21 E AERO 20 E RMY 20 05/04 50/44/47/-7/..../0.0/.../.. 36 NNE AERO 32 NNE RMY 37 05/05 48/44/46/-8/..../0.0/.../.. 18 ESE AERO 14 ESE RMY 17 05/06 The low since midnight is 46F, the daily normal low is 45F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MAY 6 HIGH 90F IN 1930 LOW 29F IN 1891 PRECIP 1.04 INCHES IN 1890 SNOWFALL TRACE IN 1917, 1952, 1996 PEAK GUST 65 MPH SSE IN 1989 RECORDS FOR MAY 7 HIGH 93F IN 1930 LOW 33F IN 1970 PRECIP 1.19 INCHES IN 2005 SNOWFALL TRACE IN 1967 PEAK GUST 66e MPH WNW IN 1940 TODAY'S REPORT PREPARED BY: Benjamin Turner