BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, SEPTEMBER 28, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0538E SUNSET:  1730E   SHOWERS AND THUNDERSTORMS OVER THE REGION AHEAD OF A COLD FRONT.... The day started on the dry side, albeit with a lot of cloud cover. Thunderstorms reached the hill by mid morning bringing occasional lightning and a brief wind gust to around 23mph. Rainfall associated with the first thunderstorm didn't amount to much despite a very brief period of heavy rain. 0.06" was measured at the 10 A.M. observation. Periods of rain have continued into the afternoon with an additional 0.15" falling by the 1 P.M. observation. Other than the brief gust with the thunderstorm, the winds have been rather light averaging between 5-10mph most of the day. Humidity levels increased today ahead of the cold front and of course due to the rain. The dew point started in the upper 50s this morning, but has reached the low-mid 60s early this afternoon. Much drier air will be realized once the cold front passes the region this evening. Visibility has been limited with all the rain, starting the day at around 35 miles, but staying generally under 10 miles thereafter. The high so far today is 67F, 1 degree below the normal max of 68F. The low since midnight is 61F, 10 degrees above the normal low of 51F. -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Broken Altocumulus, Broken Altocumulus castellanus, Thin Overcast Cirrus, Few Breaks in Overcast All Quadrants Temperature: 63F; Dew Point: 57F; Relative Humidity: 80% Wind: SSW @ 9 kts Sea-level pressure: 1009.2 mb; 29.80 in. Hg; rising, then falling Visibility: 35 miles   6-hr Max temp: 65F 6-hr Min temp: 62F 24-hr Precip: Trace BHO SA 1155 E100 BKN 130 BKN 250 -OVC 35 092/63/57/2109/980/ FEW BINOVC ALQDS VIRGA N-NNE/ 8/081 50000 70000 10065 20062 10 A.M. Weather: Scattered Cumulonimbus, Broken Altocumulus, Overcast Nimbostratus, Thunderstorm with Light Rain Showers Temperature: 61F; Dew Point: 60F; Relative Humidity: 96% Wind: WSW @ 6 kts Sea-level pressure: 1009.4 mb; 29.81 in Hg; rising unsteadily Visibility: 5 miles, Fog 3-hr Precip: 0.06 ins. BHO SA 1455 45 SCT E65 BKN 100 OVC 5TRW-F 094/61/60/2406/981/ CB OVHD-S-W MVG E OCNL LTGICCCCG VSBY ESE-SE 10 WND 18V28/ 8/37/ 52002 6006/ 1 P.M. Weather: Scattered stratocumulus, Overcast Nimbostratus, Few Stratus Fractus All Quadrants, Light Rain Temperature: 64F, Dew point: 63F; Relative Humidity: 96% Wind: WSW @ 5 kts, Wind Light Sea-level pressure: 1008.7 mb; 29.79 in Hg; falling, then more rapidly Visibility: 8 miles, Thin Fog 6-hr Max temp: 67F 6-hr Min temp: 61F 6-hr Precip: 0.21 ins. BHO SA 1755 60 SCT 100 OVC 8R- 087/64/63/2505/979/ FEW STFRA ALQDS R-B19 WND LGT/ 8/67/ 58007 6021/ 10067 20061 SUMMARY FOR MONDAY, SEPTEMBER 27, 2021 TEMPERATURE (DEGREES F) MAX.......73     NORMAL.....68 MIN.......52     NORMAL.....51 MEAN......63     NORMAL.....60 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL............. +3 TOTAL DEPARTURE FOR THE MONTH.........................+50 [+1.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY................2  DEPARTURE........-4 TOTAL HEATING UNITS FOR THE MONTH...............18  DEPARTURE.......-61 TOTAL HEATING UNITS FOR THE SEASON..............46  DEPARTURE.......-51 TOTAL HEATING UNITS LAST SEASON TO DATE.........97  DEPARTURE.......-51 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.......-10 TOTAL COOLING UNITS FOR THE SEASON.............712  DEPARTURE.......+44 TOTAL COOLING UNITS LAST SEASON TO DATE........820  DEPARTURE......-108 PEAK WIND GUST (MPH):                      Official...................30 SW  @  7:58 P.M.                      AEROVANE (south tower).....30 SW  @  9:08 P.M.                      VECTOR #2 (south tower)....31     @  7:38 P.M.                      DAVIS #2 (south tower).....29 WSW @  7:58 P.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..................23  SW  @  7:34 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............22      @  7:47 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............22  SW  @  7:47 P.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.......12.7 SW [304 total miles]                      VECTOR #2................. N/A                      DAVIS #2..................13.2 WSW                      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......TRACE  DEPARTURE....-0.15 TOTAL PRECIPITATION FOR THE MONTH.............6.23  DEPARTURE....+2.63 TOTAL PRECIPITATION FOR THE YEAR.............46.57  DEPARTURE....+8.62 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   The low since midnight is 61F, the daily normal low is 51F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR SEPTEMBER 28 HIGH 86F IN 2014 LOW 33F IN 1897,1947 PRECIP 2.46 INCHES IN 2004 PEAK GUST 69 MPH NE IN 1962 RECORDS FOR SEPTEMBER 29 HIGH 85F IN 1952 LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD) PRECIP 2.61 INCHES IN 1907 PEAK GUST 62 MPH S IN 2005 TODAY'S REPORT PREPARED BY: Augustin Busschaert/Matt Douglas