BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, MAY 29, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME CLOUDS, HUMIDITY, HAZE DOMINATE ANOTHER DAY... Today has been a close mirror to yesterday. Overnight precipitation amounted to a measly 0.03 inches bringing the 24-hour total to 0.04. This continues a below average May at -1.03 inches for the month, and -2.54 inches for the year. We truly need a decent rain event to chip away at this deficit and to also bring down the pollen count. With high pollen levels combined with dew points in the upper-60s, visibility continues to take a hit - 35 miles at best today. Skies remained mostly cloudy throughout the day with some minor splashes of sun and here, but they were far and few. Winds have notably increased this afternoon topping out so far at 37 MPH as a cold front approaches! The high so far today is 76F, this is 6 degrees above the daily normal high of 70F. The low since midnight is 66F, which is 14 degrees above the daily normal low of 52F. Today's Observations: 7 A.M. Weather: Overcast Stratus Fractus Temperature: 68F; Dew Point: 67F; Relative Humidity: 96% Wind: SSW at 14 kts Sea-level pressure: 30.06 ins. Hg: falling steadily Visibility: 30 miles, hazy 6-hr Max temp: 68F 6-hr Min temp: 66F 24-hr Precip: 0.04 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 E10 OVC 30 178/68/67/2014/006/ HAZY/ 8/7// 57003 70004 10068 20066 10 A.M. Weather: Broken Stratus Fractus; Broken Cirrocumulus Temperature: 74F; Dew Point: 68F; Relative Humidity: 83% Wind: SSW at 15G25 kts Sea-level pressure: 30.03 ins. Hg: falling, then more rapidly Visibility: 35 miles, hazy 3-hr Precip: 0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E10 BKN E230 BKN 35 170/74/68/2115G25/003/ HAZY/ 8/709 58008 1 P.M. Weather: Broken Stratocumulus Temperature: 76F; Dew Point: 67F; Relative Humidity: 74% Wind: SSW at 15G26 kts Sea-level pressure: 29.99 ins. Hg: falling, then more rapidly Visibility: 30 miles, hazy 6-hr Max temp: 76F 6-hr Min temp: 68F 6-hr Precip: 0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E20 BKN 30 155/76/67/2115G26/999/ HAZY/ 8/400 58015 10076 20068 SUMMARY FOR THURSDAY, MAY 28, 2020 TEMPERATURE (DEGREES F) MAX.....77 NORMAL.....70 MIN.....63 NORMAL.....51 MEAN....70 NORMAL.....61 DEPARTURE FROM 30-YEAR NORMAL..................+9 TOTAL DEPARTURE FOR THE MONTH.................-31 [-1.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY............... 0 DEPARTURE........-6 TOTAL HEATING UNITS FOR THE MONTH..............282 DEPARTURE.......+30 TOTAL HEATING UNITS FOR THE SEASON............5803 DEPARTURE......-484 TOTAL HEATING UNITS LAST SEASON TO DATE.......6189 DEPARTURE......-386 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY................5 DEPARTURE........+4 TOTAL COOLING UNITS FOR THE MONTH...............19 DEPARTURE.........1 TOTAL COOLING UNITS FOR THE SEASON..............19 DEPARTURE........-1 TOTAL COOLING UNITS LAST SEASON TO DATE..........8 DEPARTURE........11 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................33 SSW AT 8:34 P.M. AERO.........................33 S AT 11:48 P.M. ASOS.........................33 SSW AT 8:35 P.M. DAVIS........................33 SSW AT 8:34 P.M. RMY 33 FASTEST MILE FOR YESTERDAY......................24 SSW AT 10:02 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................23 S AT 10:27 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................23 SSW AT 8:36 P.M. AVERAGE WIND SPEED AND DIRECTION................14.1 SSW ASOS.........................14.4 DAVIS........................13.2 SSW [209 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.04 DEPARTURE......-0.10 ASOS..............0.03 TOTAL PRECIPITATION FOR THE MONTH..........2.63 DEPARTURE......-1.03 ASOS..............2.59 TOTAL PRECIPITATION FOR THE YEAR..........19.67 DEPARTURE......-2.54 ASOS.............20.19 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE........0.0 TOTAL SNOWFALL FOR THE MONTH..............Trace DEPARTURE........0.0 TOTAL SNOWFALL FOR THE SEASON..............31.9 DEPARTURE......-30.8 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 64/52/58/+5/..../0.0/000/00 46 SSE AERO 44 SSE RMY N/A 05/02 70/42/56/+3/..../0.0/729/86 41 NW AERO 40 NW RMY N/A 05/03 78/55/67/+14/0.00/0.0/613/72 35 SSW AERO 35 SSW RMY 36 05/04 72/45/59/+5/T/0.0/247/29 37 NW AERO 40 WNW RMY 39 05/05 60/40/50/-4/0.00/0.0/821/96 31 NW AERO 32 NW RMY N/A 05/06 57/38/48/-6/T/0.0/498/58 24 ESE AERO 22 ENE RMY 22 05/07 63/37/50/-5/0.00/0.0/576/67 30 WSW AERO 29 WSW RMY N/A 05/08 57/40/49/-6/..../0.0/328/38 31 W AERO 32 W RMY N/A 05/09 44/32/38/-17/..../T/484/56 52 W AERO 53 W RMY 54 05/10 59/31/45/-10/0.00/0.0/763/88 46 W AERO 46 W RMY 49 05/11 65/43/54/-2/0.22/0.0/322/37 39 S AERO 43 S RMY 41 05/12 55/37/46/-10/0.00/0.0/801/92 37 W AERO 37 W RMY 37 05/13 59/32/46/-10/0.00/0.0/864/99 37 WNW AERO 37 WNW RMY 38 05/14 70/40/55/-2/0.00/0.0/831/95 29 W AERO 26 W RMY 27 05/15 78/50/64/+7/..../0.0/535/61 40 WSW AERO 40 WSW RMY 43 05/16 69/47/58/+1/..../0.0/730/83 31 NW AERO 31 NW RMY 32 05/17 67/47/57/0/0.00/0.0/132/15 22 SSW AERO N/A RMY 21 05/18 60/47/54/-4/T/0.0/.../.. 24 W AERO 22 ENE RMY N/A 05/19 56/45/51/-7/0.00/0.0/.../.. 35 ENE AERO 34 ENE RMY 32 05/20 63/43/53/-5/0.00/0.0/.../.. 22 ESE AERO 20 SE RMY 19 05/21 76/42/59/0/0.00/0.0/.../.. 26 S AERO 25 S RMY 25 05/22 82/50/66/+7/0.00/0.0/.../.. 29 W AERO 29 W RMY 28 05/23 67/44/56/-3/0.02/0.0/.../.. 42 ENE AERO 43 ENE RMY 40 05/24 58/43/51/-8/T/0.0/.../.. 27 ENE AERO 24 ENE RMY N/A 05/25 66/46/56/-4/0.00/0.0/.../.. 18 ENE AERO 18 ENE RMY N/A 05/26 82/56/69/+9/0.00/0.0/.../.. 21 S AERO 21 S RMY 21 05/27 84/59/72/+12/0.00/0.0/.../.. 31 SSW AERO 31 SSW RMY 31 05/28 77/63/70/+9/.../0.0/.../.. 33 SSW AERO 33 S RMY 33 05/29 The low since midnight is 66F, the daily normal low is 52F DAILY RECORDS FOR MAY 2020 5/13/2020: NEW RECORD LOW OF 32F, REPLACING 35F SET IN 1914 AND 2005 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 29 HIGH 93F IN 1919 LOW 35F IN 1902 PRECIP 1.63 INS 1990 PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945 RECORDS FOR MAY 30 HIGH 93F IN 1929 LOW 39F IN 1949,1961 PRECIP 1.47 INS 1948 PEAK GUST 61e MPH NW IN 1945 TODAY'S REPORT PREPARED BY: Andrew Swanson