BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, MARCH 21, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0546E SUNSET:  1758E CLEAR CONDITIONS WITH MILD TEMPERATURES ATOP GREAT BLUE HILL.... We observed clear skies today with a visibility of 75 miles or better. The current airmass is dry, carried by a significant high pressure center. This is yielding fair weather throughout the region. Dry conditions continue to be an issue, so a fire risk persists. The wind is calmer today thankfully, with a max gust of around 16 mph early this morning. The monthly precipitation departure stands at -2.57" and the yearly departure is -2.99". The high so far today is 61F, which is 15 degrees above the normal high of 46F. The low since midnight is 39F, which is 11 degrees below the daily normal low of 28F. Today's Observations: 7 A.M. Weather: Clear Temperature: 41F; Dew Point: 19F; Relative Humidity: 41% Wind: N @ 9 kts Sea-level pressure: 30.55 in Hg; rising steadily Visibility: 75 miles 6-hr Max temp: 42F 6-hr Min temp: 39F 24-hr Precip: 0.00 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1155 CLR 75 344/41/19/0109/055/ 53011 10042 20039 10 A.M. Weather: Clear, few cirrus Temperature: 55F; Dew Point: 19F; Relative Humidity: 23% Wind: N @ 4 kts, light and variable Sea-level pressure: 30.58 in Hg; rising, then steady Visibility: 75 miles 3-hr Precip: 0.00 ins 3-hr Snow: 0.0 ins. BHO SA 1455 CLR 75 353/55/19/0104/058/ FEW CI ALQDS WND L/V/ 8/001 51009 1 P.M. Weather: Scattered cirrostratus Temperature: 59F, Dew point: 20F; Relative Humidity: 21% Wind: NW @ 4 kts, light and variable Sea-level pressure: 30.53 in Hg; falling steadily Visibility: 75 miles 6-hr Max temp: 61F 6-hr Min temp: 41F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1755 300 SCT 75 336/59/20/3204/053/ WND L/V/ 8/006 58017 10061 20041 SUMMARY FOR SATURDAY, MARCH 20, 2021 TEMPERATURE (DEGREES F) MAX.......58     NORMAL.....45 MIN.......24     NORMAL.....28 MEAN......41     NORMAL.....37 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL....... +4 TOTAL DEPARTURE FOR THE MONTH................... +2 [-0.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............24  DEPARTURE...... -4 TOTAL HEATING UNITS FOR THE MONTH..............624  DEPARTURE...... -2 TOTAL HEATING UNITS FOR THE SEASON............4669  DEPARTURE.....-525 TOTAL HEATING UNITS LAST SEASON TO DATE.......4592  DEPARTURE......+77 PEAK WIND GUST (MPH):                      420C/Official..............23 W   @  1:38 P.M.                      AEROVANE (south tower).....23 W   @  1:38 P.M.                      ASOS.......................25 W   @  1:37 P.M.                      DAVIS #1...................26 W   @  1:38 P.M.                      DAVIS #2 (south tower).....24 W   @  1:38 P.M.                      RMY........................27     @  1:36 P.M.                      VECTOR.....................29     @  1:37 P.M.                      MERLIN.....................24 FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................17 W   @  4:02 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................17 W   @  4:01 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............18 W   @  1:38 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............18 W   @  4:02 P.M. MAXIMUM 2-MINUTE RMY AVERAGE....................16 W   @  1:36 P.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................17     @  3:59 P.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL.......9.5 W [227 total miles]                      ASOS......................9.1                        DAVIS #1.................10.1 WNW                        DAVIS #2.................10.2 WNW                      RMY.......................9.3 WNW                      VECTOR....................9.8 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.19                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............0.94  DEPARTURE....-2.57                              ASOS.............0.98 TOTAL PRECIPITATION FOR THE YEAR..............8.94  DEPARTURE....-2.99                               ASOS............9.24 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HOURS ENDING 7 A.M.......... 0.0  DEPARTURE.... -0.4 TOTAL SNOWFALL FOR THE MONTH.................. 0.2  DEPARTURE.... -9.2 TOTAL SNOWFALL FOR THE SEASON.................72.6  DEPARTURE....+16.7 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   42/24/33/+2/0.13/T/020/03        69 WNW  AERO 78 WNW  RMY 78 03/02   27/10/19/-12/T/0.1/679/100       63 WNW  AERO 71 WNW  RMY 69 03/03   45/19/32/0/0.00/0.0/375/55       30 W    AERO 30 W    RMY 34 03/04   38/22/30/-2/0.00/0.0/520/76      46 NW   AERO 51 NW   RMY 53 03/05   31/18/25/-7/0.00/0.0/549/80      39 WNW  AERO 44 NW   RMY 45 03/06   33/15/24/-8/0.00/0.0/675/98      28 WNW  AERO 29 WNW  RMY 30 03/07   35/15/25/-8/0.00/0.0/686/99      21 NW   AERO 22 NW   RMY 23 03/08   38/19/29/-4/T/T/389/56           20 NW   AERO 20 NW   RMY 21 03/09   56/30/43/+10/T/T/.../..          32 WNW  AERO 35 WNW  RMY 37 03/10   54/32/43/+10/0.00/0.0/.../..     29 SSW  AERO 29 SSW  RMY 31 03/11   71/35/53/+19/0.00/0.0/.../..     41 SSW  AERO 43 SSW  RMY 46 03/12   62/42/52/+18/0.00/0.0/.../..     52 WNW  AERO 59 WNW  RMY 57 03/13   46/27/37/+3/0.00/0.0/.../..      53 WNW  AERO 59 WNW  RMY 57 03/14   45/19/32/-3/0.01/0.1/.../..      51 WNW  AERO 58 NW   RMY 58 03/15   27/12/20/-15/0.00/0.0/.../..     48 NW   AERO 47 NW   RMY 54 03/16   37/13/25/-10/0.00/0.0/.../..     22 NNW  AERO 22 NNW  RMY 23 03/17   52/27/40/+4/0.00/0.0/.../..      28 S    AERO 25 S    RMY 29 03/18   46/34/40/+4/0.80/T/.../..        38 NE   AERO 40 NE   RMY 42 03/19   39/26/33/-3/T/T/.../..           37 N    AERO 38 N    RMY 41 03/20   58/24/41/+4/0.00/0.0/.../..      23 W    AERO 23 W    RMY 27 03/21 The low since midnight is 39F, the daily normal low is 28F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MARCH 21 HIGH 81 IN 1921 LOW 2 IN 1885 PRECIP 2.67 INS. IN 1974 SNOWFALL 10.6 INS. IN 1958 PEAK GUST 72 MPH NE IN 1958 RECORDS FOR MARCH 22 HIGH 81 IN 2012 LOW 3 IN 1885 PRE 3.48 INS. IN 2001 SNOW 8.7 INS. 1967 WIND 84e MPH E IN 1977 TODAY'S REPORT PREPARED BY: Benjamin Turner