BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, APRIL 24, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME AN UNSEASONABLY CHILLY DAY WITH RAIN AND FOG FOLLOWING YESTERDAY'S BRILLIANT SUNSHINE... After a bright and tranquil Thursday, today has seen a return to overcast skies, fog and light rain. Visibility has maxed out so far at 15 miles slipping to just a 1/2 mile by 1 PM. Overnight precipitation totaled 0.15 ins with an additional 0.08 ins through the morning and into this afternoon. Winds have been somewhat light with most gusts in the 20 MPH range. Some interesting notes in the temperature department: April has been below average - currently sitting at -2.2 degrees for the month to date. Consequently, this is the first month of 2020 to feature a below average month. Also of interest is that the high so far today is 41F, which is the average low for this date! This (so far) ties for the 4th lowest high temperature on record for April 24th. We will see if we can add a few degrees before the stroke of midnight. Nonetheless, very unseasonably chilly today. Our high temperature so far today is 41F, which is 18 degrees below our daily normal high temperature of 59F. The low since midnight is 37F, which is 4 degrees below the daily normal low of 41F. Today's Observations: 7 A.M. Weather: Overcast Stratus, light rain Temperature: 38F; Dew Point: 38F; Relative Humidity: 100% Wind: NE at 10 kts Sea-level pressure: 29.83 ins. Hg: falling, then more rapidly Visibility: 15 miles, fog 6-hr Max temp: 38F 6-hr Min temp: 37F 24-hr Precip:  0.15 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 E12 OVC 15R-F 102/38/38/0410/983/ R-CTD/ 8/6// 70015 5821 10038 20037 10 A.M. Weather: Overcast Stratus, light drizzle Temperature: 40F; Dew Point: 40F; Relative Humidity: 100% Wind: NE at 10G17 kts Sea-level pressure: 29.77ins. Hg: falling, then more slowly Visibility: 5 miles, fog 3-hr Precip:   0.02 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E10 OVC 5L-F 082/40/40/0410G17/977/ L-CTD/ 8/6// 6002 53020 1 P.M. Weather: Vertical visibility 300 ft, sky obscured, light rain Temperature: 39F; Dew Point: 39F; Relative Humidity: 100% Wind: NNE at 11G27 kts Peak Wind: 31 MPH (27 kts) NNE @ 12:45 P.M. Sea-level pressure: 29.74 ins. Hg: falling, then more slowly Visibility: 1/2 mile, fog 6-hr Max temp: 41F 6-hr Min temp: 37F 6-hr Precip:  0.08 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 X W3 1/2R-F 071/39/39/0211G27/974/ R-CTD PK WND 0327/45/ 8/// 6008 56011 10041 20038 SUMMARY FOR THURSDAY, APRIL 23, 2020 TEMPERATURE (DEGREES F) MAX.....55   NORMAL.....59 MIN.....29   NORMAL.....41 MEAN....42   NORMAL.....50 DEPARTURE FROM 30-YEAR NORMAL....................-8 TOTAL DEPARTURE FOR THE MONTH...................-47 [-2.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............23  DEPARTURE........+8 TOTAL HEATING UNITS FOR THE MONTH..............498  DEPARTURE.......+45 TOTAL HEATING UNITS FOR THE SEASON............5371  DEPARTURE......-565 TOTAL HEATING UNITS LAST SEASON TO DATE.......5781  DEPARTURE......-410 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................31 W   AT  12:47 A.M.                      AERO.........................29 W   AT   1:19 A.M                     ASOS.........................30 W   AT  12:02 A.M.                    DAVIS........................32 NWN AT  12:02 A.M. RMY N/A FASTEST MILE FOR YESTERDAY......................26 W   AT  12:02 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................23 W   AT  12:14 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................25 W   AT  12:03 A.M. AVERAGE WIND SPEED AND DIRECTION................12.0 W                                  ASOS.........................12.1                    DAVIS........................12.3 WSW [255 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.15  DEPARTURE......+0.02                          ASOS..............0.14 TOTAL PRECIPITATION FOR THE MONTH..........6.15  DEPARTURE......+2.53                          ASOS..............6.33 TOTAL PRECIPITATION FOR THE YEAR..........15.48  DEPARTURE......-2.14                          ASOS.............16.06 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.1 TOTAL SNOWFALL FOR THE MONTH................4.3  DEPARTURE.......+1.5 TOTAL SNOWFALL FOR THE SEASON..............31.9  DEPARTURE......-30.6 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/.../..         41 W   AERO 40 W   RMY N/A 04/15  52/36/44/-3/0.02/0.0/.../..         37 W   AERO 36 W   RMY 37 04/16  47/32/40/-7/T/T/.../..              33 WNW AERO 33 WNW RMY 32 04/17  49/29/39/-8/..../0.0/.../..         41 W   AERO 39 W   RMY 41 04/18  37/31/34/-14/..../4.3/.../..        29 NE  AERO 25 NE  RMY 25 04/19  60/31/46/-2/0.00/0.0/.../..         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 The low since midnight is 37F, daily normal minimum is 41F 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 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 APRIL 25 HIGH 83 IN 2009 LOW 24 IN 1892 PRECIP 1.38 IN. IN 1901 SNOWFALL 0.7 IN. IN 2002. PEAK GUST 66 MPH SE IN 1968 TODAY'S REPORT PREPARED BY: Andrew Swanson