BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, FEBRUARY 21, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME CLEAR, ABUNDANT SUNSHINE AND EXCELLENT VISIBILITY ATOP GREAT BLUE HILL... Clear bluebird skies dominated our region today. This was accompanied by excellent visibility remaining at a consistent 85 miles. A snow-capped Mount Monadnock in southwestern New Hampshire was seen throughout observations! Winds have been much gentler than yesterday with only a 24 MPH gust earlier in the day- in fact, winds were calm by 1PM. Below normal temperatures have persisted into today with ocean effect snow showers noted to our far southeast. The high so far today is 26F degrees, this is 12 degrees below the normal of 38F. The low since midnight is 11F, 9 degrees below the normal daily minimum of 20F. Today's Observations: 7 A.M. Weather: Clear, few cumulus offshore, virga distant SE Temperature: 11F; Dew Point: -2F; Wind: NNW at 9G19 kts, Relative Humidity: 53% Sea-level pressure: 30.43 ins. Hg: falling, then rising Visibility: 86 miles 6-hr Max temp: 17F 6-hr Min temp: 11F 24-hr Precip:  0.00 ins. 24-hr Snowfall: 0.0 ins. BHO SA 1155 CLR 85 306/11/-2/3409G19/043/ FEW CU OFFSHR VIRGA DSNT SE/ 8/200 53005 10017 20011 10 A.M. Weather: Clear, few cumulus offshore, virga distant SE Temperature: 20F; Dew Point: 0F; Wind: NNW at 8 kts, Relative Humidity: 42% Sea-level pressure: 30.47 ins. Hg: rising, then rising more slowly Visibility: 85 miles 3-hr Precip:  0.00 ins. 3-hr Snowfall: 0.0 ins. BHO SA 1455 CLR 85 319/20/0/3408/047/ FEW CU OFFSHR VIRGA DSNT SE/ 8/200 51013 1 P.M. Weather: Clear, few cumulus offshore, virga distant SE Temperature: 26F; Dew Point: -1F; Wind: Calm Relative Humidity: 31% Sea-level pressure: 30.42 ins. Hg: steady, then decreasing Visibility: 85 miles 6-hr Max temp: 26F 6-hr Min temp: 11F 6-hr Precip:  0.00 ins. 6-hr Snowfall: 0.0 ins. BHO SA 1755 CLR 85 302/26/-1/0000/042/ FEW CU OFFSHR VIRGA DSNT SE WND CALM/ 8/200 52017 10026 20011 SUMMARY FOR THURSDAY, FEBRUARY 20, 2020 TEMPERATURE (DEGREES F) MAX.....31   NORMAL.....38 MIN.....18   NORMAL.....20 MEAN....25   NORMAL.....29 DEPARTURE FROM 30-YEAR NORMAL....................-4 TOTAL DEPARTURE FOR THE MONTH...................+101 [+4.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............40  DEPARTURE....... +4 TOTAL HEATING UNITS FOR THE MONTH..............654  DEPARTURE......-103 TOTAL HEATING UNITS FOR THE SEASON............3883  DEPARTURE......-404 TOTAL HEATING UNITS LAST SEASON TO DATE.......4194  DEPARTURE......-311 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................32 W   AT 12:47 A.M.                      AERO.........................32 W   AT 12:44 A.M.                      ASOS.........................32 WNW AT 12:42 A.M.                    DAVIS........................34 W   AT 12:42 A.M. RMY n/a FASTEST MILE FOR YESTERDAY......................24 W   AT 12:45 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................22 W   AT 12:44 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................24 W   AT 12:43 A.M. AVERAGE WIND SPEED AND DIRECTION.............10.4 WNW                                   ASOS......................9.9                    DAVIS.....................10.9 WNW [293 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.20  DEPARTURE......-0.61                          ASOS..............2.30 TOTAL PRECIPITATION FOR THE YEAR...........3.66  DEPARTURE......-3.50                          ASOS..............3.84 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.5 TOTAL SNOWFALL FOR THE MONTH................0.6  DEPARTURE.......-9.3 TOTAL SNOWFALL FOR THE SEASON..............24.8  DEPARTURE......-18.2 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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 02/01  38/30/34/+8/0.01/T/..../..          14 WSW AERO 14 WSW RMY N/A 02/02  40/30/35/+9/0.00/0.0/..../..        18 W   AERO 18 WNW RMY 18 02/03  44/27/36/+10/0.00/0.0/..../..       28 W   AERO 28 W   RMY 28 02/04  44/33/39/+13/0.00/0.0/..../..       19 E   AERO 16 E   RMY 18 02/05  41/30/36/+10/0.00/0.0/..../..       20 NNW AERO 19 NNW RMY N/A 02/06  31/30/34/+8/0.00/0.0/..../..        29 E   AERO 28 E   RMY 27 02/07  53/25/39/+12/..../0.1/..../..       71 WSW AERO 71 SSW RMY 73 02/08  33/20/27/0/T/T/..../..              46 W   AERO 44 W   RMY 44 02/09  33/15/24/-3/T/T/..../..             30 SSE AERO 29 SSE RMY N/A 02/10  42/33/38/+11/..../0.0/..../..       39 SSW AERO 39 SSW RMY 39 02/11  40/36/38/+11/..../0.0/..../..       24 W   AERO 23 W   RMY N/A 02/12  41/30/36/+9/0.00/0.0/..../..        37 W   AERO 36 W   RMY N/A 02/13  35/31/34/+6/.00/0.0/..../..         29 SSW AERO 29 SSW RMY N/A 02/14  33/8/21/-7/0.00/0.0/..../..         32 WNW AERO 32 NW  RMY 34 02/15  27/4/16/-12/0.00/0.0/..../..        31 SSW AERO 31 SSW RMY N/A 02/16  40/23/32/+4/0.00/0.0/..../..        38 SW  AERO 38 SW  RMY N/A 02/17  44/28/36/+8/0.00/0.0/..../..        25 WNW AERO 24 WNW RMY 24 02/18  37/27/32/+3/0.31/T/..../..          26 SE  AERO 26 SE  RMY N/A 02/19  42/25/34/+5/0.00/0.0/.../..         45 W   AERO 46 W   RMY 44 02/20  31/18/25/-4/0.00/0.0/.../..         32 W   AERO 32 W   RMY N/A 02/21 The low since midnight is 11F, daily normal minimum is 20F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR FEBRUARY 21 HIGH 70F IN 2018 LOW -6F IN 1950 PRECIP 2.42 INCHES IN 1898 SNOWFALL 9.0 INCHES IN 1929 PEAK GUST 72 MPH WNW IN 1967 RECORDS FOR FEBRUARY 22 HIGH 63F IN 1997 LOW -1F IN 1918 PRECIP 1.38 INCHES IN 1900 SNOWFALL 8.0 INCHES IN 1893 PEAK GUST 74 MPH S IN 1974 TODAY'S REPORT PREPARED BY: Andrew Swanson