BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, APRIL 11, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0510E SUNSET:  1821E FOGGY WITH INCREASING WIND ATOP GREAT BLUE HILL.... Today consisted of fog with a maximum visibility of 6 miles and an average visibility of less than an 1/8th mile. Wind has increased since this morning, reaching a peak gust higher than 30 mph following noontime. This northeasterly breeze is keeping temperatures on the lower side in comparison to yesterday, where the max temperature was 75F.   The high so far today is 45F, this is 9 degrees below the normal high of 54F. The low since midnight is 42F, which is 6 degrees above the daily normal low of 36F. Today's Observations: 7 A.M. Weather: Fog Temperature: 43F; Dew Point: 43F; Relative Humidity: 100% Wind: NNE at 15G20 kts Sea-level pressure: 29.76 in Hg, falling then rising   Visibility: 1/16th mile, fog 6-hr Max temp: 52F 6-hr Min temp: 43F 24-hr Precip: 0.00 ins. 24-hr Snow: 0.0 ins. Snow Depth: 0 ins. BHO SA 1155 X W3 1/16F 079/43/43/0315G20/976/ 8//// 50014 10052 20043 10 A.M. Weather: Overcast stratus Temperature: 44F; Dew Point: 42F; Relative Humidity: 93% Wind: NNE @ 10G22 kts Sea-level pressure: 29.77 in Hg; falling then rising Visibility: 6 miles, fog 3-hr Precip: 0.00 ins. 3-hr Snow: 0.0 ins. BHO SA 1455 OVC 10 6F 081/44/42/0310G22/977/ 8/6// 50002 1 P.M. Weather: Broken cumulus and cirrostratus Temperature: 72F, Dew point: 50F; Relative Humidity: 46% Wind: WSW @ 7 kts Sea-level pressure: 29.89 in Hg; falling steadily Visibility: 65 miles 6-hr Max temp: 74F 6-hr Min temp: 48F 6-hr Precip: 0.00 ins. 6-hr Snow: 0.0 ins. Snow Depth: 0 ins. SUMMARY FOR SATURDAY, APRIL 10, 2021 TEMPERATURE (DEGREES F) MAX.......75     NORMAL.....53 MIN.......43     NORMAL.....36 MEAN......59     NORMAL.....45 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.......+14 TOTAL DEPARTURE FOR THE MONTH...................+43 [+4.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY................6  DEPARTURE......-14 TOTAL HEATING UNITS FOR THE MONTH..............179  DEPARTURE......-43 TOTAL HEATING UNITS FOR THE SEASON............4001  DEPARTURE.....-705 TOTAL HEATING UNITS LAST SEASON TO DATE.......5087  DEPARTURE......-86 PEAK WIND GUST (MPH):                      420C/Official..............26 SSW @  6:15 P.M.                      AEROVANE (south tower).....28 SSW @  5:36 P.M.                      ASOS.......................28 S   @  6:17 P.M.                      DAVIS #1...................27 S   @  6:13 P.M.                      DAVIS #2 (south tower).....29 S   @  5:42 P.M.                      RMY........................30     @  6:15 P.M.                      VECTOR.....................29     @  6:12 P.M.                      MERLIN.....................27 FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................20 SSW @  5:34 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................20 SSW @  6:59 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............20 SSW @  5:47 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............21 S   @  5:40 P.M. MAXIMUM 2-MINUTE RMY AVERAGE....................20 SSW @  5:44 P.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................20     @  5:43 P.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL.......11.1 SW [266 total miles]                      ASOS......................11.3                        DAVIS #1..................10.8 SW                        DAVIS #2..................11.4 SW                      RMY.......................11.1 SW                      VECTOR....................11.6 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.18                              ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............0.89  DEPARTURE....-0.81                              ASOS.............0.87 TOTAL PRECIPITATION FOR THE YEAR.............11.06  DEPARTURE....-4.63                               ASOS...........11.38 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HOURS ENDING 7 A.M...........0.0  DEPARTURE.... -0.1 TOTAL SNOWFALL FOR THE MONTH ................TRACE  DEPARTURE.....-1.6 TOTAL SNOWFALL FOR THE SEASON.................72.6  DEPARTURE....+11.8 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   56/30/43/+2/0.89/T/.../..        44 NW   AERO 51 NW   RMY 49 04/02   37/24/31/-10/0.00/0.0/.../..     28 NW   AERO 32 NNW  RMY 30 04/03   48/23/36/-6/0.00/0.0/.../..      24 NW   AERO 25 NW   RMY 26 04/04   58/33/46/+4/0.00/0.0/.../..      38 NNW  AERO 41 NNW  RMY 41 04/05   57/41/49/+6/T/T/.../..           41 NNW  AERO 48 NNW  RMY 50 04/06   61/40/51/+8/0.00/0.0/.../..      26 NNW  AERO 25 NNW  RMY 31 04/07   57/41/49/+6/0.00/0.0/.../..      23 ENE  AERO 21 ENE  RMY 22 04/08   59/43/51/+7/0.00/0.0/.../..      22 ENE  AERO 22 ENE  RMY 24 04/09   69/42/56/+12/0.00/0.0/.../..     24 S    AERO  M   M  RMY 26 04/10   75/43/59/+14/0.00/0.0/.../..     26 SSW  AERO 28 SSW  RMY 30 04/11   The low since midnight is 42F, the daily normal low is 36F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR APRIL 11 HIGH 85 IN 2017 LOW 19 IN 1909 PRECIP 1.72 IN. IN 2003 SNOWFALL 9.5 IN. IN 1958 PEAK GUST 65 MPH NW IN 1963 RECORDS FOR APRIL 12 HIGH 82 IN 1945 LOW 17 IN 1926 PRECIP 1.51 IN. IN 1993 SNOWFALL 9.0 IN. IN 1894 PEAK GUST 65e MPH W IN 1978 TODAY'S REPORT PREPARED BY: Benjamin Turner