BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, MAY 20, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0418E SUNSET:  1904E A FAIR WEATHER DAY WITH LIGHT WIND AND LIMITED VISIBILITY.... Today was mostly clear save some upper level clouds throughout the day. Visibility was around 50 miles on average, the wind was almost calm. The precipitation deficit continues at 4 inches on the year and about a half inch for the month. The lack of wind in the region is fortunate since there is a lower chance of a brush fire. The high so far today is 75F, which is 7 degrees above the normal high of 68F. The low since midnight is 53F, which is 4 degrees above the daily normal low of 49F. Today's Observations: 7 A.M. Weather: Scattered cirrus Temperature: 64F; Dew Point: 40F; Relative Humidity: 40% Wind: Calm Sea-level pressure: 30.50 in. Hg; rising steadily Visibility: 65 miles, thin smoke layer 6-hr Max temp: 64F 6-hr Min temp: 53F 24-hr Precip: 0.00 ins. BHO SA 1155 250 SCT 65 329/64/40/0000/050/ THN K LYR ALQDS/ 8/001 51018 10064 20053 10 A.M. Weather: Scattered cirrus Temperature: 70F; Dew Point: 35F; Relative Humidity: 27% Wind: ESE @ 4 kts, light and variable Sea-level pressure: 30.51 in Hg; steady, then rising Visibility: 55 miles 3-hr Precip: 0.00 ins. BHO SA 1455 250 SCT 55 331/70/35/1204/051/ WND L/V/ 8/001 50002 1 P.M. Weather: Clear, few cirrus Temperature: 73F, Dew point: 44F; Relative Humidity: 35% Wind: E @ 10G15 kts Sea-level pressure: 30.49 in Hg; falling, then steady Visibility: 60 miles 6-hr Max temp: 75F 6-hr Min temp: 64F 6-hr Precip: 0.00 ins. BHO SA 1755 250 SCT 60 326/73/44/0810G15/049/ 8/001 58005 10075 20064 SUMMARY FOR WEDNESDAY, MAY 19, 2021 TEMPERATURE (DEGREES F) MAX.......75     NORMAL.....67 MIN.......55     NORMAL.....49 MEAN......65     NORMAL.....58 DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.......+7 TOTAL DEPARTURE FOR THE MONTH...................+27 [+1.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL THRU JUN) TOTAL HEATING UNITS FOR YESTERDAY............... 0  DEPARTURE.......-8 TOTAL HEATING UNITS FOR THE MONTH..............159  DEPARTURE......-34 TOTAL HEATING UNITS FOR THE SEASON............5500  DEPARTURE.....-728 TOTAL HEATING UNITS LAST SEASON TO DATE.......5753  DEPARTURE.....-253 COOLING DEGREE DAYS (SEASON JAN THRU DEC) TOTAL COOLING UNITS FOR YESTERDAY............... 0  DEPARTURE.......-1 TOTAL COOLING UNITS FOR THE MONTH............... 4  DEPARTURE.......-5 TOTAL COOLING UNITS FOR THE SEASON.............. 4  DEPARTURE.......-7 TOTAL COOLING UNITS LAST SEASON TO DATE......... 2  DEPARTURE.......+2 PEAK WIND GUST (MPH):                      420C/Official..............25 NE   @  6:28 A.M.                      AEROVANE (south tower).....23 NNE  @  6:17 A.M.                      ASOS.......................26 NE   @  6:29 A.M.                      DAVIS #1...................25 ENE  @  6:29 A.M.                      DAVIS #2 (south tower).....27 ENE  @  6:28 A.M.                      RMY........................27      @  6:24 A.M.                      VECTOR.....................27      @  6:25 A.M.                      MERLIN.....................N/A FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................17 NE  @  6:34 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................17 NE  @  6:55 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............18 ENE @  6:55 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............18 NE  @  6:28 A.M. MAXIMUM 2-MINUTE RMY AVERAGE....................17 ENE @  6:24 A.M. MAXIMUM 2-MINUTE VECTOR AVERAGE.................17     @  6:25 A.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL......9.4 ENE [226 total miles]                      ASOS.....................9.3                      DAVIS #1.................9.8 ENE                      DAVIS #2.................9.7 ENE                      RMY......................9.3 SE                      VECTOR...................9.8 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.14                             ASOS.............0.00 TOTAL PRECIPITATION FOR THE MONTH.............1.80  DEPARTURE....-0.55                              ASOS.............1.74 TOTAL PRECIPITATION FOR THE YEAR.............16.86  DEPARTURE....-4.04                               ASOS...........17.02 PRELIMINARY CLIMATE SUMMARY FOR MAY 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 05/01   62/38/50/-3/0.06/0.0/659/78       31 WNW  AERO 35 WNW  RMY 40 05/02   76/48/62/+9/0.01/0.0/220/26       41 SW   AERO 41 SW   RMY 46 05/03   67/48/58/+5/0.07/0.0/400/47       21 E    AERO 20 E    RMY 20 05/04   50/44/47/-7/0.78/0.0/000/00       36 NNE  AERO 32 NNE  RMY 37 05/05   48/44/46/-8/0.47/0.0/000/00       18 ESE  AERO 14 ESE  RMY 17 05/06   64/45/55/+1/0.00/0.0/780/91       33 NW   AERO 38 NNW  RMY 39 05/07   61/43/52/-3/0.00/0.0/516/60       28 ESE  AERO 22 ESE  RMY 26 05/08   54/40/47/-8/0.00/0.0/069/08       24 SSW  AERO 23 SSW  RMY 25 05/09   66/42/54/-1/T/0.0/579/67          30 SW   AERO 29 SW   RMY 34 05/10   60/45/53/-2/0.39/0.0/.../..       21 W    AERO 20 W    RMY 20 05/11   63/45/54/-2/0.00/0.0/.../..       38 WNW  AERO 41 WNW  RMY 41 05/12   65/41/53/-3/0.00/0.0/.../..       28 NW   AERO M  M    RMY 31 05/13   69/45/57/+1/0.00/0.0/.../..       22 WNW  AERO 21 WNW  RMY 21 05/14   76/49/63/+8/0.00/0.0/.../..       23 WNW  AERO 23 WNW  RMY 25 05/15   75/55/65/+8/0.01/0.0/.../..       24 SSE  AERO 26 SSE  RMY 26 05/16   78/54/66/+9/0.01/0.0/.../..       36 W    AERO 37 W    RMY 42 05/17   77/52/65/+8/0.00/0.0/.../..       20 SSW  AERO 21 SSW  RMY 21 05/18   81/54/68/+10/T/0.0/.../..         32 W    AERO 30 W    RMY 32 05/19   75/55/65/+7/0.00/0.0/.../..       25 NE   AERO 23 NNE  RMY 27 05/20 The low since midnight is 53F, the daily normal low is 49F   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MAY 20 HIGH 91F IN 1975,1996 LOW 37F IN 1948, 2002 PRECIP 1.65 INCHES IN 1969 PEAK GUST 57 MPH S IN 1963, WNW IN 1982 RECORDS FOR MAY 21 HIGH 92F IN 1921 LOW 35F IN 1907 PRECIP 1.61 INS IN 1954 PEAK GUST 74 MPH WSW IN 2006 TODAY'S REPORT PREPARED BY: Benjamin Turner