BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MAY 7, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME PLEASANT SPRING DAY WITH A MIX OF CLOUDS AND SUN.... Today has been a pretty pleasant day with a mix of sun and clouds and temperatures this afternoon close to normal. The air is very dry however with dew points falling into the upper teens and low 20s giving us pretty low relative humidity levels. The high so far today is 63F, this is 1 degree below our daily normal high temperature of 64F. The low since midnight is 37F, which is 8 degrees below the daily normal low of 45F. PRELIMINARY STATS FOR APRIL 2020 TEMPERATURE, Deg. F Avg. Max. 50.6 [-5.1] Avg. Min. 35.8 [-1.9] Mean      43.4 [-3.3] 24-hour corrected mean: 42.9 Max. for month: 63F on the 7th Min. for month: 28F on the 1st HEATING DEGREE DAYS Total heating units:    648 [+97] Total for the season:  5521 [-514] Total for last season: 5900 PRECIPITATION, Inches Total: 7.71 [+3.16] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: 4.3 [+1.3] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 13.9 mph Avg. corrected wind speed:   14.3 mph Prevailing wind direction:   W [24%] Peak gust and direction:     79 S on the 13th SUNSHINE: Campbell-Stokes card minutes: N/A Astronomical total minutes: N/A Today's Observations: 7 A.M. Weather: Scattered altocumulus/altostratus Temperature: 43F; Dew Point: 39F; Relative Humidity: 87% Wind: WSW at 4 kts   Sea-level pressure: 29.70 ins. Hg: falling then rising Visibility: 75 miles 6-hr Max temp: 43F 6-hr Min temp: 37F 24-hr Precip: TRACE 24-hr Snowfall: 0.0 ins. BHO SA 1155 80 SCT 75 056/43/39/2504/970/ 8/070 53004 70000 10043 20037 10 A.M. Weather: Broken cumulus, broken altocumulus Temperature: 56F; Dew Point: 26F; Relative Humidity: 31% Wind: NW at 7G19 kts Sea-level pressure: 29.68 ins. Hg: falling, then steady Visibility: 70 miles 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E50 BKN 80 BKN 70 051/56/26/3307G19/968/ 8/270 56005 1 P.M. Weather: Broken cumulus Temperature: 60F; Dew Point: 21F; Relative Humidity: 22% Wind: NW at 9G16 kts Sea-level pressure: 29.67 ins. Hg: falling, steady Visibility: 60 miles 6-hr Max temp: 63F 6-hr Min temp: 43F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E70 BKN 60 047/60/21/3209G16/967/ 8/200 56004 10063 20043 SUMMARY FOR WEDNESDAY, MAY 6, 2020 TEMPERATURE (DEGREES F) MAX.....57   NORMAL.....64 MIN.....38   NORMAL.....45 MEAN....48   NORMAL.....54 DEPARTURE FROM 30-YEAR NORMAL.................. -6 TOTAL DEPARTURE FOR THE MONTH..................+17 [+2.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............17  DEPARTURE....... +6 TOTAL HEATING UNITS FOR THE MONTH...............54  DEPARTURE.......-17 TOTAL HEATING UNITS FOR THE SEASON............5575  DEPARTURE......-531 TOTAL HEATING UNITS LAST SEASON TO DATE.......5997  DEPARTURE......-422 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE........ 0 TOTAL COOLING UNITS FOR THE MONTH................2  DEPARTURE........+1 TOTAL COOLING UNITS FOR THE SEASON...............2  DEPARTURE........-2 TOTAL COOLING UNITS LAST SEASON TO DATE..........0  DEPARTURE........+2 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................24 ESE AT  8:28 P.M.                      AERO.........................22 ENE AT  1:04 P.M.                     ASOS.........................23 ENE AT  1:06 P.M.                    DAVIS........................22 ENE AT  1:05 P.M. RMY 22 FASTEST MILE FOR YESTERDAY......................17 ESE AT  8:31 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................16 ESE AT  8:32 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 ENE AT  2:20 P.M. AVERAGE WIND SPEED AND DIRECTION................ 7.9 ENE                                  ASOS......................... 8.9                    DAVIS........................ 8.5 ENE [072 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE  DEPARTURE......-0.13                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.94  DEPARTURE......+0.19                          ASOS..............0.96 TOTAL PRECIPITATION FOR THE YEAR..........17.97  DEPARTURE......-1.33                          ASOS.............18.60 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........0.0 TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE........0.0 TOTAL SNOWFALL FOR THE SEASON..............31.9  DEPARTURE......-30.8 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  42/28/35/-6/0.00/0.0/008/01         28 NE  AERO 28 NE  RMY 30 04/02  46/35/41/0/.../0.0/000/00           39 NW  AER0 40 NW  RMY 41 04/03  42/38/40/-2/..../0.0/000/00         48 NE  AERO 53 NE  RMY 49 04/04  46/36/41/-1/..../0.0/278/36         38 NE  AERO 38 NE  RMY N/A 04/05  55/36/46/+3/T/0.0/039/05            22 S   AERO 21 S   RMY 21 04/06  61/40/51/+8/0.00/0.0/732/94         29 NW  AERO 30 NW  RMY 29 04/07  63/42/53/+10/0.00/0.0/649/83        29 W   AERO 30 W   RMY 28 04/08  50/41/46/+2/..../.../047/06         23 S   AERO 22 S   RMY 22 04/09  47/37/42/-2/..../.../000/00         58 W   AERO 58 W   RMY 56 04/10  47/35/41/-4/0.02/T/324/41           48 W   AERO 50 W   RMY 53 04/11  51/33/42/-3/0.00/0.0/730/92         38 WNW AERO 39 WNW RMY 40 04/12  60/33/47/+2/0.00/0.0/326/41         38 S   AERO 40 S   RMY N/A 04/13  59/50/55/+9/1.42/0.0/000/00         79 S   AERO 83 S   RMY 78 04/14  57/41/49/+3/0.00/0.0/641/80         41 W   AERO 40 W   RMY N/A 04/15  52/36/44/-3/0.02/0.0/450/56         37 W   AERO 36 W   RMY 37 04/16  47/32/40/-7/T/T/379/47              33 WNW AERO 33 WNW RMY 32 04/17  49/29/39/-8/..../0.0/591/73         41 W   AERO 39 W   RMY 41 04/18  37/31/34/-14/..../4.3/000/00        29 NE  AERO 25 NE  RMY 25 04/19  60/31/46/-2/0.00/0.0/693/85         40 SSW AERO 40 SSW RMY 41 04/20  49/37/43/-6/0.00/0.0/.../..         25 ENE AERO 22 W   RMY N/A 04/21  53/33/43/-6/..../.../.../..         52 S   AERO 52 S   RMY 52 04/22  43/30/37/-12/0.00/0.0/.../..        51 W   AERO 50 W   RMY 50 04/23  55/29/42/-8/0.00/0.0/.../..         31 W   AERO 29 W   RMY N/A 04/24  42/37/40/-10/..../.../.../..        31 NNE AERO 29 NNE RMY 29 04/25  60/38/49/-1/0.00/0.0/.../..         25 S   AERO 24 S   RMY 24 04/26  51/38/45/-6/..../0.0/.../..         51 NE  AERO 50 NE  RMY 50 04/27  39/35/37/-14/..../T/.../..          54 NE  AERO 52 NNE RMY 55 04/28  48/35/42/-10/..../.../.../..        28 N   AERO 27 N   RMY N/A 04/29  55/35/45/-7/0.00/0.0/.../..         24 ENE AERO 23 ENE RMY 22 04/30  52/42/47/-5/.../0.0/.../..          36 SE  AERO 32 SE  RMY N/A DAILY RECORDS FOR APRIL 2020 4/13/2020 NEW PEAK GUST OF 79 MPH S, REPLACING THE OLD RECORD OF 59 MPH SSW IN 1995 4/18/2020 NEW RECORD SNOWFALL OF 4.3 INS, REPLACING THE OLD RECORD OF 3.7 INS IN 1965 4/27/2020 NEW RECORD LOW MAX TEMPERATURE OF 39F, REPLACING THE OLD RECORD OF 40F IN 1917 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/.../..         46 SSE  AERO 44 SSE RMY N/A 05/02  70/42/56/+3/..../0.0/.../..         41 NW   AERO 40 NW  RMY N/A 05/03  78/55/67/+14/0.00/0.0/.../..        35 SSW  AERO 35 SSW RMY 36 05/04  72/45/59/+5/T/0.0/.../..            37 NW   AERO 40 WNW RMY 39   05/05  60/40/50/-4/0.00/0.0/.../..         31 NW   AERO 32 NW  RMY N/A 05/06  57/38/48/-6/T/0.0/.../..            24 ESE  AERO 22 ENE RMY 22 05/07 The low since midnight is 37F, 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 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 RECORDS FOR MAY 8 HIGH 89F IN 2000 LOW 29F IN 1956 PRECIP 1.48 INCHES IN 1886 SNOWFALL TRACE IN 1898, 1947 PEAK GUST 68e MPH NNW IN 1943 TODAY'S REPORT PREPARED BY: Matt Douglas and Benjamin Turner