BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, SEPTEMBER 30, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0540E SUNSET:  1730E   CLOUDY AND COOL ATOP GREAT BLUE HILL.... Today consisted of cool, fall-like weather with an average visibility of 80 miles. Wind was northwesterly with an average speed of 10 mph. The highest gust so far today is 18 mph. Cloud cover increased around noontime, covering up almost all of the sky. Today was dry with dew points in the mid 40's. This makes for another nice fall day. The high so far today is 60F, 7 degrees below the normal max of 67F. The low since midnight is 48F, 2 degrees below the normal low of 50F. -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Scattered stratocumulus, broken altocumulus Temperature: 50F; Dew Point: 47F; Relative Humidity: 89% Wind: NNW @ 10 kts Sea-level pressure: 1017.4 mb; 30.04 in. Hg; rising, then more rapidly Visibility: 70 miles   6-hr Max temp: 51F 6-hr Min temp: 48F 24-hr Precip: 0.01 ins. BHO SA 1155 50 SCT 120 BKN 70 174/50/47/3410/004/ 8/550 70001 53009 10051 20048 10 A.M. Weather: Scattered Cumulus Temperature: 57F; Dew Point: 45F; Relative Humidity: 64% Wind: WNW @ 10G15 kts Sea-level pressure: 1017.1 mb; 30.03 in Hg; rising then falling Visibility: 80 miles 3-hr Precip: 0.00 ins. BHO SA 1455 40 SCT 80 171/57/45/3010G15/003/ 8/200 55003 1 P.M. Weather: Broken stratocumulus Temperature: 57F, Dew point: 43F; Relative Humidity: 59% Wind: N @ 9G16 kts Sea-level pressure: 1017.2 mb; 30.03 in Hg; rising then falling Visibility: 80 miles 6-hr Max temp: 60F 6-hr Min temp: 49F 6-hr Precip: 0.00 ins. BHO SA 1755 60 BKN 80 172/57/43/3409G16/003/ 8/800 50001 10060 20049 SUMMARY FOR WEDNESDAY, SEPTEMBER 29, 2021 TEMPERATURE (DEGREES F) MAX.......63     NORMAL.....67 MIN.......45     NORMAL.....50 MEAN......54     NORMAL.....59 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL............. -5 TOTAL DEPARTURE FOR THE MONTH.........................+46 [+1.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY...............11  DEPARTURE........+4 TOTAL HEATING UNITS FOR THE MONTH...............34  DEPARTURE.......-59 TOTAL HEATING UNITS FOR THE SEASON..............62  DEPARTURE.......-49 TOTAL HEATING UNITS LAST SEASON TO DATE.........97  DEPARTURE.......-35 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE........-1 TOTAL COOLING UNITS FOR THE MONTH...............62  DEPARTURE.......-12 TOTAL COOLING UNITS FOR THE SEASON.............712  DEPARTURE.......+43 TOTAL COOLING UNITS LAST SEASON TO DATE........826  DEPARTURE......-118 PEAK WIND GUST (MPH):                      Official...................25 NNW @ 12:23 A.M.                      AEROVANE (south tower).....25 NNW @ 12:23 A.M.                      VECTOR #2 (south tower)....26     @ 12:23 A.M.                      DAVIS #2 (south tower).....22 NNW @ 12:23 A.M.                      ASOS...........OUT OF SERVICE D/T RENOVATIONS                      VECTOR #1......OUT OF SERVICE D/T RENOVATIONS                      DAVIS #1.......OUT OF SERVICE D/T RENOVATIONS                      RMY............OUT OF SERVICE D/T RENOVATIONS                        MERLIN.........OUT OF SERVICE D/T RENOVATIONS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................15 NNW  @  1:05 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............15      @ 12:59 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............15 N    @  1:00 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE RMY AVERAGE........OUT OF SERVICE D/T RENOVATIONS AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL........8.0 NNW [191 total miles]                      VECTOR #2..................8.7                      DAVIS #2...................8.3 N                      RMY.................OUT OF SERVICE D/T RENOVATIONS                      ASOS................OUT OF SERVICE D/T RENOVATIONS                      VECTOR #1...........OUT OF SERVICE D/T RENOVATIONS                      DAVIS #1............OUT OF SERVICE D/T RENOVATIONS    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.01  DEPARTURE....-0.14 TOTAL PRECIPITATION FOR THE MONTH.............6.64  DEPARTURE....+2.74 TOTAL PRECIPITATION FOR THE YEAR.............46.98  DEPARTURE....+8.73 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/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 09/01   68/56/62/-7/1.47/000/00          34 NNE AERO 37 NNE RMY N/A     09/02   71/55/63/-6/2.53/322/41          49 ENE AERO 52 ENE RMY N/A 09/03   72/52/62/-6/0.00/735/94          23 NW  AERO 23 NW  RMY N/A 09/04   76/55/66/-2/0.00/757/97          22 WNW AERO 21 WNW RMY N/A 09/05   72/60/66/-2/0.04/008/01          27 S   AERO 29 S   RMY N/A 09/06   80/61/71/+3/0.00/557/72          24 WNW AERO 25 WNW RMY N/A 09/07   78/57/68/+1/0.00/732/95          23 WSW AERO 22 WSW RMY N/A 09/08   81/61/71/+4/0.00/646/84          43 S   AERO 45 S   RMY N/A 09/09   71/64/68/+1/0.90/000/00          33 S   AERO 36 S   RMY N/A 09/10   74/55/65/-1/0.04/595/78          31 NW  AERO 32 WNW RMY N/A 09/11   75/51/63/-3/0.00/730/96          24 SW  AERO 24 SW  RMY N/A 09/12   79/60/70/+4/0.00/591/78          33 SW  AERO 32 SW  RMY N/A 09/13   77/62/70/+5/0.06/559/74          22 NW  AERO 23 NW  RMY N/A 09/14   75/59/67/+2/0.00/444/59          23 S   AERO 25 S   RMY N/A 09/15   82/65/74/+9/T/539/72             32 SSW AERO 35 SSW RMY N/A 09/16   69/61/65/+1/0.27/037/05          24 ENE AERO 24 ENE RMY N/A TSTM       09/17   66/60/63/-1/0.02/000/00          22 NE  AERO 23 NE  RMY N/A 09/18   74/62/68/+5/0.04/207/28          17 WNW AERO 18 WNW RMY N/A TSTM 09/19   71/57/64/+1/0.15/619/84          23 NNE AERO 24 NNE RMY N/A 09/20   71/55/63/0/0.00/588/80           20 SE  AERO 20 SE  RMY N/A 09/21   75/55/65/+3/0.00/.../..          19 SSE AERO 20 SSE RMY N/A 09/22   75/65/70/+8/0.02/.../..          30 S   AERO 30 S   RMY N/A 09/23   78/65/72/+10/0.08/.../..         36 SSE AERO 37 SSE RMY N/A 09/24   75/62/69/+8/0.02/.../..          43 SSE AERO 45 SSE RMY N/A 09/25   74/59/67/+6/0.02/.../..          14 N   AERO 14 NNW RMY N/A 09/26   73/54/64/+4/0.57/.../..          33 WNW AERO 32 WNW RMY N/A 09/27   73/52/63/+3/T/.../..             30 SW  AERO 30 SW  RMY N/A 09/28   67/52/60/+1/0.40/.../..          27 SSW AERO 25 SSW RMY N/A TSTM 09/29   63/45/54/-5/..../.../..          25 NNW AERO 25 NNW RMY N/A 09/30   The low since midnight is 48F, the daily normal low is 50F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR SEPTEMBER 30 HIGH 84F IN 1986 LOW 31F IN 1992 PRECIP 2.44 INCHES IN 2015 PEAK GUST 71 MPH S IN 2020 RECORDS FOR OCTOBER 1 HIGH 85F IN 1927 LOW 30F IN 1992 PRECIP 1.63 INCHES IN 2014 PEAK GUST 68e MPH SSE IN 1977 TODAY'S REPORT PREPARED BY: Benjamin Turner