BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, APRIL 4, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME A WET AND CHILLY START LEAD TO A CLEARER AFTERNOON.... Following some much-needed rainfall overnight, the observatory has experienced fair weather in the afternoon. Since 7 A.M. yesterday, 1.60 inches of rain fell, ending around 6 A.M. this morning. With a net increase in pressure, visibility rose from 5 miles this morning to 70 miles this afternoon. Wind decreased as the day went on, becoming less than 10 mph by 2 P.M.       Our high temperature so far today is 44F, which is 7 degrees below our daily normal high temperature of 51F. The low since midnight is 36F, which is 3 degrees above the daily normal low of 33F. PRELIMINARY STATS FOR MARCH 2020 TEMPERATURE, Deg. F Avg. Max. 49.8 [+5.5] Avg. Min. 32.3 [+5.7] Mean      41.4 [+5.9] 24-hour corrected mean: 40.5 Max. for month: 72F on the 9th Min. for month: 15F on the 1st HEATING DEGREE DAYS Total heating units:    733 [-183] Total for the season:  4873 [-611] Total for last season: 5432 PRECIPITATION, Inches Total: 4.67 [-0.91] Greatest in 24 hrs: N/A SNOWFALL, Inches Total: 2.8 [-9.9] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 12.6 mph Avg. corrected wind speed:   12.9 mph Prevailing wind direction:   W [12%] Peak gust and direction:     56 W on the 4th SUNSHINE: Campbell-Stokes card minutes: N/A Astronomical total minutes: N/A Today's Observations: 7 A.M. Weather: Overcast stratus Temperature: 36F; Dew Point: 36F; Relative Humidity: 100% Wind: NNE at 11G21 kts Peak wind: 36 MPH (31 kts) NE at 5:25 A.M. Sea-level pressure: 30.02 ins. Hg: rising steadily Visibility: 5 miles, fog 6-hr Max temp: 39F 6-hr Min temp: 36F 24-hr Precip:  1.60 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 E20 OVC 5F 165/36/36/0211G21/002/ PK WND 0531/1025/ 8/6// 70160 53023 10039 20036 10 A.M. Weather: Overcast stratus Temperature: 39F; Dew Point: 36F; Relative Humidity: 89% Wind: NNE at 12G21 kts Sea-level pressure: 30.05 ins. Hg: rising steadily Visibility: 15 miles, thin fog 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E20 OVC 15 175/39/36/0312G21/005/ THN FG ALQDS/ 8/6// 51010 1 P.M. Weather: Broken stratocumulus Temperature: 44F; Dew Point: 36F; Relative Humidity: 74% Wind: NE at 10G15 kts Sea-level pressure: 30.03 ins. Hg: rising then falling Visibility: 70 miles 6-hr Max temp: 44F 6-hr Min temp: 36F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 E20 BKN 70 170/44/36/0410G15/003/ 8/400 58005 10044 20036 SUMMARY FOR FRIDAY, APRIL 3, 2020 TEMPERATURE (DEGREES F) MAX.....42   NORMAL.....51 MIN.....38   NORMAL.....33 MEAN....40   NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL....................-2 TOTAL DEPARTURE FOR THE MONTH....................-8 [-2.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............25  DEPARTURE........+2 TOTAL HEATING UNITS FOR THE MONTH...............79  DEPARTURE........+8 TOTAL HEATING UNITS FOR THE SEASON............4952  DEPARTURE......-603 TOTAL HEATING UNITS LAST SEASON TO DATE.......5474  DEPARTURE......-522 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................48 NE  AT 11:39 A.M.                      AERO.........................53 NE  AT  4:58 P.M                     ASOS.........................49 N   AT  1:23 P.M.                    DAVIS........................48 NE  AT 10:40 A.M. RMY 49 FASTEST MILE FOR YESTERDAY......................33 NNE AT 10:52 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................31 NNE AT  2:33 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................33 NNE AT 10:51 A.M. AVERAGE WIND SPEED AND DIRECTION..............21.9 NE                                  ASOS.......................20.7                    DAVIS......................21.0 NNE [29 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.60  DEPARTURE......+1.43                          ASOS..............1.77 TOTAL PRECIPITATION FOR THE MONTH..........1.60  DEPARTURE......+2.21                          ASOS..............1.77 TOTAL PRECIPITATION FOR THE YEAR..........12.05  DEPARTURE......-2.46                          ASOS.............12.55 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.2 TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.......-0.6 TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE......-32.7 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 03/01  33/15/24/-7/0.00/0.0/676/100        28 WNW AERO 28 WNW RMY 27 03/02  52/24/38/+7/T/T/482/71              40 S   AERO 39 S   RMY 41 03/03  64/45/55/+23/..../0.0/361/53        30 S   AERO 30 S   RMY N/A 03/04  50/38/44/+12/..../0.0/561/82        56 W   AERO 56 W   RMY 58 03/05  51/32/42/+10/0.00/0.0/666/97        31 W   AERO 31 NW  RMY 32 03/06  47/30/39/+7/..../.../283/41         46 NE  AERO 45 NE  RMY 46 03/07  43/26/35/+2/..../.../534/77         42 N   AERO 43 N   RMY 44 03/08  53/26/40/+7/0.00/0.0/508/73         31 W   AERO 30 W   RMY 28 03/09  72/40/56/+23/0.00/0.0/685/98        32 SW  AERO 32 SW  RMY 31 03/10  68/49/59/+26/0.00/0.0/246/35        48 WSW AERO 46 WSW RMY 49 03/11  56/37/47/+13/0.00/0.0/501/71        31 WNW AERO M  M   RMY 21 03/12  46/31/39/+5/..../0.0/156/22         21 SE  AERO 18 SE  RMY N/A 03/13  59/38/49/+15/..../0.0/000/00        46 WNW AERO 44 WNW RMY 46 03/14  51/35/43/+8/0.00/0.0/613/86         37 W   AERO 36 W   RMY 35 03/15  47/28/38/+3/0.00/0.0/680/95         28 NW  AERO 28 NW  RMY N/A 03/16  36/22/29/-6/0.00/0.0/618/86         21 NE  AERO 21 ESE RMY 21 03/17  43/28/36/0/..../0.4/000/00          29 W   AERO 30 W   RMY 29 03/18  54/31/43/+7/..../0.0/609/84         26 S   AERO 26 S   RMY 26 03/19  43/37/40/+4/..../0.0/000/00         36 E   AERO 35 E   RMY 34 03/20  66/37/52/+15/..../0.0/000/00        48 W   AERO 48 W   RMY 46 03/21  55/29/42/+5/0.00/0.0/535/73         45 W   AERO 48 W   RMY N/A 03/22  36/23/30/-7/0.00/0.0/692/94         23 NE  AERO 24 NE  RMY 23 03/23  40/25/33/-5/..../1.6/037/05         38 NNE AERO 39 NNE RMY 38 03/24  48/33/41/+3/..../.../148/20         37 NNW AERO 37 NNW RMY N/A 03/25  41/35/38/0/0.03/0.0/000/00          28 ENE AERO 28 ENE RMY 27 03/26  51/30/41/+2/..../0.0/613/82         25 SSE AERO 26 SSW RMY N/A 03/27  61/41/51/+12/..../0.0/.../..        32 NW  AERO M  M   RMY 33 03/28  56/36/46/+7/..../0.0/.../..         22 S   AERO 21 E   RMY N/A 03/29  43/37/40/0/..../0.0/.../..          32 NE  AERO 33 NE  RMY 33 03/30  40/34/37/-3/..../0.0/.../..         33 NE  AERO 33 NE  RMY 33 03/31  40/29/35/-6/..../0.0/.../..         28 ENE AERO 26 ENE RMY N/A 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/.../..         28 NE  AERO 28 NE  RMY 30 04/02  46/35/41/0/.../0.0/.../..           39 NW  AER0 40 NW  RMY 41 04/03  42/38/40/-2/..../0.0/.../..         48 NE  AERO 53 NE  RMY 49 04/04 The low since midnight is 36F, daily normal minimum is 33F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR APRIL 4 HIGH 76 IN 2010 LOW 12 IN 1954 PRECIP 1.45 IN. IN 1987 SNOWFALL 7.3 IN. IN 2016 PEAK GUST 80 MPH WNW IN 1963 RECORDS FOR APRIL 5 HIGH 81 IN 1928 LOW 15 IN 1995 PRECIP 2.15 IN. IN 1987 SNOWFALL 4.0 IN. IN 1898 PEAK GUST 76 MPH WNW IN 1963 TODAY'S REPORT PREPARED BY: Benjamin Turner