BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, MAY 23, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME FRONTAL PASSAGE THIS MORNING LEFT SOME RAINFALL, AS WELL AS A TEMPERATURE DROP.... We observed limited visibility due to fog after a light rain this morning that left only 0.02 inches. Visibility was 20 miles this morning, decreasing to 10 miles in the afternoon. Wind was strong, with a max gust of 40 mph. This was after a wind shift from WNW to ENE. The temperature dropped from 65F at 7 A.M. to 52F following the frontal passage. The high so far today is 65F, this is 3 degrees below the daily normal high of 68F. The low since midnight is 52F, which is 2 degrees above the daily normal low of 50F. Today's Observations: 7 A.M. Weather: Broken altocumulus and cirrus Temperature: 65F; Dew Point: 65F; Relative Humidity: 100% Wind: WNW at 7 kts   Sea-level pressure: 30.04 ins. Hg: rising steadily Visibility: 20 miles, distant fog 6-hr Max temp: 61F 6-hr Min temp: 51F 24-hr Precip:  0.02 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 E110 BKN 250 BKN 20 172/65/65/3007/004/ DSNT FG ALQDS/ 8/072 70002 53009 10065 20063 10 A.M. Weather: Scattered stratus fractus, broken altocumulus and cirrus Temperature: 58F; Dew Point: 40F; Relative Humidity: 50% Wind: ENE at 18G35 kts, peak of 41 mph at 9:20 A.M. Sea-level pressure: 29.97 ins. Hg: rising, then more rapdily Visibility: 20 miles, distant fog 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 40 SCT E110 BKN 250 BKN 20 150/58/40/0718G35/997/ DSNT FG ALQDS PK WND 0636/20/ 8/772 53022 1 P.M. Weather: Broken altocumulus and cirrus Temperature: 52F; Dew Point: 42F; Relative Humidity: 68% Wind: SW at 13G27 kts, peak of 33 mph at 12:38 P.M. Sea-level pressure: 29.92 ins. Hg: falling then rising Visibility: 10 miles, thin fog 6-hr Max temp: 65F 6-hr Min temp: 52F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E110 BKN 250 BKN 10 134/52/42/0713G27/992/ THN FG ALQDS PK WND 0729/38/ 8/072 51016 10065 20052 SUMMARY FOR FRIDAY, MAY 22, 2020 TEMPERATURE (DEGREES F) MAX.....82   NORMAL.....68 MIN.....50   NORMAL.....49 MEAN....66   NORMAL.....59 DEPARTURE FROM 30-YEAR NORMAL..................+7 TOTAL DEPARTURE FOR THE MONTH..................-46 [-2.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY................0  DEPARTURE........-7 TOTAL HEATING UNITS FOR THE MONTH..............250  DEPARTURE.......+35 TOTAL HEATING UNITS FOR THE SEASON............5771  DEPARTURE......-479 TOTAL HEATING UNITS LAST SEASON TO DATE.......6159  DEPARTURE......-388 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY................1  DEPARTURE.........0 TOTAL COOLING UNITS FOR THE MONTH................3  DEPARTURE........-8 TOTAL COOLING UNITS FOR THE SEASON...............3  DEPARTURE.......-10 TOTAL COOLING UNITS LAST SEASON TO DATE..........4  DEPARTURE........-1 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................26 S  AT 12:43 P.M.                      AERO.........................25 S  AT 12:46 P.M.                     ASOS.........................29 W  AT 12:22 P.M.                    DAVIS........................31 W  AT 12:44 P.M. RMY 28 FASTEST MILE FOR YESTERDAY......................21 W  AT 1:29 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................20 SW AT 6:43 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................22 W  AT 1:29 P.M. AVERAGE WIND SPEED AND DIRECTION................13.9 WSW                                  ASOS.........................13.3                    DAVIS........................13.3 WSW [243 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02  DEPARTURE......-0.12                          ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........2.55  DEPARTURE......-0.18                          ASOS..............2.54 TOTAL PRECIPITATION FOR THE YEAR..........19.61  DEPARTURE......-1.69                          ASOS.............20.15 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  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 The low since midnight is 52F, the daily normal low is 50F   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 23 HIGH 92F IN 1964,1992 LOW 38F IN 1976 PRECIP 0.97 INS IN 1979 PEAK GUST 49e MPH W IN 1945 RECORDS FOR MAY 24 HIGH 92F IN 1964 LOW 35F IN 1956 PRECIP 2.13 INS IN 1951 PEAK GUST 54 MPH NNE IN 2005 TODAY'S REPORT PREPARED BY: Benjamin Turner