BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 22, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME A STRONG WESTERLY WIND KEEPS TEMPERATURES LOW AS THE SKY BECOMES OVERCAST IN THE AFTERNOON HOURS... The day started off with partly cloudy skies and chilly temperatures in the low 30s. However clouds quickly increased by mid to late morning with some snow flurries between the 10 A.M. and 1 P.M. observations. We observed only a trace of snow during that time. Visibility has remained good, being 70 miles on average. A west wind has been increasing steadily into early this afternoon with frequent gusts over 40 mph and a peak gust thus far of 47 mph at 11:50 P.M. Despite intermittent sunshine, temperatures are lower than seasonal averages. This is due to significant cold air advection from the west. Our high temperature so far today is 41F, which is 17 degrees below our daily normal high temperature of 58F. The low since midnight is 30F, which is 10 degrees below the daily normal low of 40F. Today's Observations: 7 A.M. Weather: Scattered cumulus Temperature: 32F; Dew Point: 14F; Relative Humidity: 46% Wind: S at 23G39 kts, peak wind W 45 MPH at 6:50 A.M. Sea-level pressure: 29.68 ins. Hg: rising steadily Visibility: 75 miles 6-hr Max temp: 32F 6-hr Min temp: 30F 24-hr Precip:  0.34 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 50 SCT 75 051/32/14/2823G39/968/ PK WND 2739/50/ 8/100 70034 53020 10032 20030 10 A.M. Weather: Broken altostratus Temperature: 36F; Dew Point: 18F; Relative Humidity: 48% Wind: W at 21G33 kts, peak wind W 42 MPH at 9:19 A.M. Sea-level pressure: 29.69 ins. Hg: falling then rising Visibility: 75 miles 3-hr Precip:   0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 E70 BKN 75 056/36/18/2721G33/969/ PK WND 2836/19/ 8/020 600// 50005 1 P.M. Weather: Broken stratocumulus Temperature: 40F; Dew Point: 17F; Relative Humidity: 39% Wind: W at 17G37 kts, peak wind W 47 MPH at 11:41 A.M. Sea-level pressure: 29.69 ins. Hg: rising unsteadily Visibility: 65 miles 6-hr Max temp: 41F 6-hr Min temp: 32F 6-hr Precip:   Trace 6-hr Snowfall: Trace BHO SA 1755 E50 BKN 65 057/40/17/2717G37/969/ NEW SNOW PST 6 HRS TRACE PK WND 2843/1641/ 8/800 600// 52001 10041 20032 SUMMARY FOR TUESDAY, APRIL 21, 2020 TEMPERATURE (DEGREES F) MAX.....53   NORMAL.....58 MIN.....33   NORMAL.....40 MEAN....43   NORMAL.....49 DEPARTURE FROM 30-YEAR NORMAL................... -6 TOTAL DEPARTURE FOR THE MONTH...................-27 [-1.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............22  DEPARTURE....... +6 TOTAL HEATING UNITS FOR THE MONTH..............447  DEPARTURE.......+26 TOTAL HEATING UNITS FOR THE SEASON............5320  DEPARTURE......-585 TOTAL HEATING UNITS LAST SEASON TO DATE.......5748  DEPARTURE......-428 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................52 S   AT 12:23 P.M.                      AERO.........................52 S   AT 12:59 P.M                     ASOS.........................52 S   AT 12:24 P.M.                    DAVIS........................53 S   AT 12:24 P.M. RMY 52 FASTEST MILE FOR YESTERDAY......................38 S   AT 12:38 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................36 S   AT 12:25 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................37 S   AT 12:25 P.M. AVERAGE WIND SPEED AND DIRECTION................18.8 S                                  ASOS.........................18.0                    DAVIS........................18.2 SSW [209 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.34  DEPARTURE......+0.21                          ASOS..............0.35 TOTAL PRECIPITATION FOR THE MONTH..........6.00  DEPARTURE......+2.66                          ASOS..............6.19 TOTAL PRECIPITATION FOR THE YEAR..........15.33  DEPARTURE......-2.22                          ASOS.............15.92 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE....... 0.0 TOTAL SNOWFALL FOR THE MONTH................4.3  DEPARTURE.......+1.6 TOTAL SNOWFALL FOR THE SEASON..............31.9  DEPARTURE......-30.5 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 The low since midnight is 30F, daily normal minimum is 40F 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 22 HIGH 85 IN 1977, 2001 LOW 26 IN 1981 PRECIP 1.85 IN. IN 2000 SNOWFALL 3.0 IN. IN 1940 PEAK GUST 68e MPH NW IN 1945 RECORDS FOR APRIL 23 HIGH 85 IN 1908, 2007 LOW 25 IN 1933,1989 PRECIP 1.99 IN. IN 2012 SNOWFALL 2.0 IN. IN 2012 PEAK GUST 64 MPH WNW IN 1962 TODAY'S REPORT PREPARED BY: Benjamin Turner