BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, MAY 25, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME WARM DAY WITH CALM WINDS ON TOP OF THE GREAT BLUE HILL… Winds significantly decreased compared to yesterday, becoming light a variable at time. Clear sky’s at the 7 A.M. observation with increasing clouds during the afternoon hours. Great visibility, with 80 miles observed throughout the day. The high so far today is 74F, 6 degree above the daily normal maximum of 68F. The low since midnight is 56F, 6 degrees above the normal minimum of 50F. Today's Observations: 7 A.M. Weather: Clear Temperature: 57F; Dew Point: 50F; Wind: WNW at 7 kts Sea-level pressure: 30.16 ins. Hg, rising, then more slowly Visibility: 80 miles 6-hr Max temp: 61F 6-hr Min temp: 47F 24-hr Precip: 0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins. BHO SA 1155 CLR 80 216/57/50/2907/016/ 8/000 51015 10061 20047 10 A.M. Weather: Scattered cirrostratus Temperature: 67F; Dew Point: 54F; Wind: WNW at 04 kts, Wind: Wind Light Sea-level pressure: 30.18 ins. Hg, steady then rising Visibility: 80 miles 3-hr Precip: 0.00 ins. BHO SA 1455 250 SCT 80 221/67/54/2904/018/ FEW CU ALQDS WND LGT 8/001 53005 1 P.M. Weather: Broken cirrostratus Temperature: 74F; Dew Point: 44F; Wind: WSW at 5 kts, Sea-level pressure: 30.13 ins. Hg, falling, then more rapidly Visibility: 80 miles 6-hr Max temp: 74F 6-hr Min temp: 61F 6-hr Precip: 0.00 ins. BHO SA 1755 250 BKN 80 205/74/44/2505/013/ FEW CU FEW SC/ 8/008 58016 10074 20061 SUMMARY FOR FRIDAY, MAY 24, 2019 TEMPERATURE (DEGREES F) MAX.....68   NORMAL.....68 MIN.....47   NORMAL.....50 MEAN....58   NORMAL.....59 DEPARTURE FROM 30-YEAR NORMAL.........................-1 TOTAL DEPARTURE FOR THE MONTH.......................-55 [-2.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............7   DEPARTURE.........-1 TOTAL HEATING UNITS FOR THE MONTH.............273   DEPARTURE........+45 TOTAL HEATING UNITS FOR THE SEASON...........6174   DEPARTURE........-89 TOTAL HEATING UNITS LAST SEASON TO DATE......5825   DIFFERENCE......+349 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE.........0 TOTAL COOLING UNITS FOR THE MONTH...............4   DEPARTURE.........-11 TOTAL COOLING UNITS FOR THE SEASON..............4   DEPARTURE.........39 TOTAL COOLING UNITS LAST SEASON TO DATE........39   DEPARTURE........-35 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................47 NW AT 11:08 A.M.                    AERO.........................47 NW AT 11:21 A.M.                    ASOS.........................50 NNW AT 9:59 A.M.                    DAVIS........................50 W AT 9:58 A.M.  RMY 51 FASTEST MILE FOR YESTERDAY......................35 NW AT 10:35 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................33 NW AT 10:37 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................36 NW AT 8:54 A.M. AVERAGE WIND SPEED AND DIRECTION...............16.1 W                    ASOS........................15.7                    DAVIS.......................16.3 W [178 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.......0.12                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.27  DEPARTURE.......+0.22                          ASOS..............3.23 TOTAL PRECIPITATION FOR THE YEAR..........24.45  DEPARTURE.......+2.85                          ASOS.............24.28 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 57/40/49/-4/0.00/0.0/.../..           21 S   AERO 21 SSE  RMY 21 05/02 45/41/43/-10/0.02/0.0/.../..          21 NE  AERO 21 SSW  RMY 20 05/03 60/43/52/-1/..../.../.../..           23 S   AERO 23 S    RMY 22 05/04 54/46/50/-4/..../.../.../..           14 ENE AERO 14 ENE  RMY 17 05/05 52/44/48/-6/0.00/0.0/.../..           18 NE  AERO 20 NE   RMY N/A 05/06 58/44/51/-3/..../0.0/.../..           25 NE  AERO 26 ENE  RMY 24 05/07 72/41/57/+2/0.12/0.0/.../..           30 S   AERO 29 S    RMY 30 05/08 67/48/58/+3/0.00/0.0/.../..           20 NE  AERO 20 NE   RMY 19 05/09 60/43/52/-3/0.00/0.0/.../..           21 SE  AERO 21 E    RMY 22 05/10 61/46/54/-1/0.16/0.0/.../..           35 S   AERO 37 S    RMY 37 05/11 68/50/59/+3/..../.../.../..           26 NW  AERO M  M    RMY N/A 05/12 50/36/43/-13/0.68/.../.../..          30 ENE AERO M  M    RMY N/A 05/13 52/38/45/-11/..../.../.../..          35 E   AERO M  M    RMY 34 05/14 44/38/41/-16/..../.../.../..          26 NNE AERO M  M    RMY 25 05/15 58/40/49/-8/..../.../.../..           28 NW  AERO M  M    RMY 28 05/16 68/46/57/0/..../.../.../..            17 NW  AERO M  M    RMY 19 05/17 64/49/57/0/..../.../.../..     22 WNW AERO 21 WNW  RMY 25 05/18 72/49/61/+3/..../.../.../..           26 SSE AERO 25 SSE  RMY 29 05/19 69/50/60/+2/..../.../.../..           39 S   AERO 43 SSE  RMY 42 05/20 85/52/69/11/..../.../.../..     35 SW  AERO 40 SW   RMY 39 05/21 69/52/61/+2/0.00/.../.../..           40 NW  AERO 46 NW   RMY 45 05/22 68/49/59/0/0.00/.../.../..            32 NNW AERO 29 NW   RMY N/A 05/23 68/48/58/-1/.../.../.../..     36 SSW AERO 37 SSW  RMY 40 05/24 68/47/58/-1/.../.../.../.. 47 NW  AERO 47 NW   RMY 51 05/25 Low temp since midnight is 48F; normal low is 50F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 24 HIGH 82 IN 2001 LOW 22 IN 1930 PRECIP 2.51 INS IN 1898 SNOWFALL 1.2 INS IN 1967 PEAK GUST 59 MPH NW IN 1962 RECORDS FOR MAY 25 HIGH 91F IN 2007 LOW 37F IN 1967 PRECIP 3.73 INS IN 1967 PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY) TODAY'S REPORT PREPARED BY: Nicholas Rousseau