BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, MAY 20, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME FAIR WEATHER WITH A LIGHT, COOL NORTHEASTERLY BREEZE.... Today was partly cloudy, with 80 miles of visibility on average. Wind was light and easterly, with a max gust of only 17 mph. Pressure has been on a steady decline as well as the humidity, which reached 29% by the 1 P.M. observation. The high so far today is 62F, this is 5 degrees below the daily normal high of 67F. The low since midnight is 43F, which is 6 degrees below the daily normal low of 49F. Today's Observations: 7 A.M. Weather: Scattered cirrus Temperature: 51F; Dew Point: 35F; Relative Humidity: 53% Wind: ENE at 7 kts   Sea-level pressure: 30.50 ins. Hg: steady, then rising Visibility: 80 miles 6-hr Max temp: 51F 6-hr Min temp: 43F 24-hr Precip:  0.00 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 250 SCT 80 327/51/35/0707/050/ 8/002 52020 10051 20043 10 A.M. Weather: Scattered cirrus Temperature: 59F; Dew Point: 32F; Relative Humidity: 36% Wind: ENE at 5 kts, light Sea-level pressure: 30.47 ins. Hg: rising, then more slowly Visibility: 80 miles 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 250 SCT 80 335/59/32/0705/047/ WND LGT/ 8/002 50008 1 P.M. Weather: Clear, few cirrus Temperature: 60F; Dew Point: 28F; Relative Humidity: 29% Wind: ESE at 7 kts Sea-level pressure: 30.46 ins. Hg: rising then falling Visibility: 75 miles 6-hr Max temp: 62F 6-hr Min temp: 51F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 CLR 75 331/60/28/1107/046/ FEW CI ALQDS/ 8/002 58004 10062 20051 SUMMARY FOR TUESDAY, MAY 19, 2020 TEMPERATURE (DEGREES F) MAX.....56   NORMAL.....67 MIN.....44   NORMAL.....48 MEAN....51   NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL...................-7 TOTAL DEPARTURE FOR THE MONTH..................-48 [-2.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............14  DEPARTURE........+7 TOTAL HEATING UNITS FOR THE MONTH..............232  DEPARTURE.......+39 TOTAL HEATING UNITS FOR THE SEASON............5753  DEPARTURE......-475 TOTAL HEATING UNITS LAST SEASON TO DATE.......6149  DEPARTURE......-396 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE........-1 TOTAL COOLING UNITS FOR THE MONTH................2  DEPARTURE........-6 TOTAL COOLING UNITS FOR THE SEASON...............2  DEPARTURE........-8 TOTAL COOLING UNITS LAST SEASON TO DATE..........0  DEPARTURE........+2 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................35 ENE AT 7:45 A.M.                      AERO.........................34 ENE AT 7:34 A.M.                     ASOS.........................35 ENE AT 7:45 A.M.                    DAVIS........................34 ENE AT 7:45 A.M. RMY 32 FASTEST MILE FOR YESTERDAY......................23 ENE AT 7:46 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................23 ENE AT 7:46 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................24 ENE AT 7:46 A.M. AVERAGE WIND SPEED AND DIRECTION................12.0 NE                                  ASOS.........................11.8                    DAVIS........................12.4 ENE [068 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.55  DEPARTURE......+0.20                          ASOS..............2.54 TOTAL PRECIPITATION FOR THE YEAR..........19.59  DEPARTURE......-1.31                          ASOS.............20.04 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/.../..         39 S    AERO 43 S   RMY 41 05/12  55/37/46/-10/0.00/0.0/.../..        37 W    AERO 37 W   RMY 37 05/13  59/32/46/-10/0.00/0.0/.../..        37 WNW  AERO 37 WNW RMY 38 05/14  70/40/55/-2/0.00/0.0/.../..         29 W    AERO 26 W   RMY 27 05/15  78/50/64/+7/..../0.0/.../..         40 WSW  AERO 40 WSW RMY 43 05/16  69/47/58/+1/..../0.0/.../..         31 NW   AERO 31 NW  RMY 32 05/17  67/47/57/0/0.00/0.0/.../..          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 The low since midnight is 43F, the daily normal low is 49F   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 20 HIGH 91F IN 1975,1996 LOW 37F IN 1948, 2002 PRECIP 1.65 INCHES IN 1969 PEAK GUST 57 MPH S IN 1963, WNW IN 1982 RECORDS FOR MAY 21 HIGH 92F IN 1921 LOW 35F IN 1907 PRECIP 1.61 INS IN 1954 PEAK GUST 74 MPH WSW IN 2006 TODAY'S REPORT PREPARED BY: Benjamin Turner