BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, SEPTEMBER 18, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0528E SUNSET:  1748E   CLOUDS HANGING TOUGH SO FAR, BUT SKY IS STARTING TO BRIGHTEN... We started the day in the clouds here on the summit with only 1/8th mile visibility. Drizzle developed late yesterday afternoon and continued through the overnight and into mid-morning this morning. 0.05" of measurable water resulted from the drizzle, 0.04" of which falling prior to 7 A.M. and 0.01" coming after. Clouds have been hanging tough into early this afternoon, but the cloud heights have lifted allowing for 40 miles of visibility. While no breaks in the overcast are showing, brightening of the sky is occurring, so it's just a matter of time before we get at least a little sun later this afternoon. The high so far today is 68F, this is 4 degrees below the daily normal maximum of 72F. The low so far today is 62F, which is 7 degrees above the daily normal minimum of 55F. -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Sky Obscured, Vertical Visibility 200 feet, light drizzle Temperature: 63F; Dew Point: 63F; Relative Humidity: 100% Wind: NNE @ 4 kts, wind light Sea-level pressure: 1019.9 mb; 30.12 in. Hg; falling, then rising Visibility: 1/8 mile, fog   6-hr Max temp: 63F 6-hr Min temp: 62F 24-hr Precip: 0.04 ins. BHO SA 1155 X W2 1/8L-F 199/63/63/0204/012/ WND LGT/ 8//// 53003 6002/ 70004 10063 20062 10 A.M. Weather: Sky Obscured, Vertical Visibility 300 feet Temperature: 65F; Dew Point: 65F; Relative Humidity: 100% Wind: ENE @ 6 kts Sea-level pressure: 1018.6 mb; 30.08 in Hg; falling, then more rapidly Visibility: 1 mile, fog   3-hr Precip: 0.01 ins. BHO SA 1455 X W3 1F 186/65/65/0606/008/ 8//// 58013 6001/ 1 P.M. Weather: Overcast Stratus Temperature: 67F, Dew point: 66; Relative Humidity: 96% Wind: WNW @ 3 kts, wind light and variable Sea-level pressure: 1017.4 mb; 30.04 in Hg; rising, then falling Visibility: 40 miles 6-hr Max temp: 68F 6-hr Min temp: 63F 6-hr Precip: 0.01 ins. BHO SA 1755 E6 OVC 40 174/67/66/3003/004/ WND L/V/ 8/6// 58012 6001/ 10068 20063 SUMMARY FOR FRIDAY, SEPTEMBER 17, 2021 TEMPERATURE (DEGREES F) MAX.......66     NORMAL.....72 MIN.......60     NORMAL.....55 MEAN......63     NORMAL.....64 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL.............-1 TOTAL DEPARTURE FOR THE MONTH.........................+2 [-0.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY................2  DEPARTURE........-1 TOTAL HEATING UNITS FOR THE MONTH...............12  DEPARTURE.......-20 TOTAL HEATING UNITS FOR THE SEASON..............40  DEPARTURE.......-10 TOTAL HEATING UNITS LAST SEASON TO DATE.........29  DEPARTURE.......+11 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY................0  DEPARTURE........-2 TOTAL COOLING UNITS FOR THE MONTH...............41  DEPARTURE.......-17 TOTAL COOLING UNITS FOR THE SEASON.............691  DEPARTURE.......+37 TOTAL COOLING UNITS LAST SEASON TO DATE........807  DEPARTURE......-116 PEAK WIND GUST (MPH):                      Official...................22 NE  @  9:46 A.M.                      AEROVANE (south tower).....23 NE  @  8:20 A.M.                      VECTOR #2 (south tower)....24     @  9:46 A.M.                      DAVIS #2 (south tower).....22 ENE @  8:20 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 NE   @  9:49 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............15      @  9:47 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............16 ENE  @ 12:34 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 *LAST OF TWO OCCURRENCES AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL....... 8.7 NE  [208 total miles]                      VECTOR #2................. 9.2                      DAVIS #2.................. 9.1 ENE                      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.......0.04  DEPARTURE....-0.11 TOTAL PRECIPITATION FOR THE MONTH.............5.35  DEPARTURE....+3.23 TOTAL PRECIPITATION FOR THE YEAR.............45.69  DEPARTURE....+9.22 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/.../..          24 WNW AERO 25 WNW RMY N/A 09/07   78/57/68/+1/0.00/.../..          23 WSW AERO 22 WSW RMY N/A 09/08   81/61/71/+4/0.00/.../..          43 S   AERO 45 S   RMY N/A 09/09   71/64/68/+1/0.90/.../..          33 S   AERO 36 S   RMY N/A 09/10   74/55/65/-1/0.04/.../..          31 NW  AERO 32 WNW RMY N/A 09/11   75/51/63/-3/0.00/.../..          24 SW  AERO 24 SW  RMY N/A 09/12   79/60/70/+4/0.00/.../..          33 SW  AERO 32 SW  RMY N/A 09/13   77/62/70/+5/0.06/.../..          22 NW  AERO 23 NW  RMY N/A 09/14   75/59/67/+2/0.00/.../..          23 S   AERO 25 S   RMY N/A 09/15   82/65/74/+9/T/.../..             32 SSW AERO 35 SSW RMY N/A 09/16   69/61/65/+1/0.27/.../..          24 ENE AERO 24 ENE RMY N/A TSTM       09/17   66/60/63/-1/0.02/.../..          22 NE  AERO 23 NE  RMY N/A 09/18   The low since midnight is 62F, the daily normal low is 55F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR SEPTEMBER 18 HIGH 88F IN 1906 LOW 36F IN 1919 PRECIP 4.25 INCHES IN 1996 PEAK GUST 77e MPH WNW IN 1948 RECORDS FOR SEPTEMBER 19 HIGH 87F IN 1906,1983 LOW 37F IN 1929 PRECIP 3.69 INCHES IN 1936 PEAK GUST 55 MPH S IN 2012 TODAY'S REPORT PREPARED BY: Matt Douglas