BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, AUGUST 15, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0452E SUNSET:  1845E PLENTY OF SUNSHINE WITH MUCH COOLER AND DRIER AIR... What a difference today compared to the past 4 days. After a stretch of hot and humid weather, today is offering welcomed relief with temperatures in the upper 70s to low 80s. More importantly, the dewpoint is about 15-20 degrees lower today making it feel very refreshing! With the drier air mass in place, visibility has been excellent today holding around 70 miles all day. The wind has been mainly on the light side out of the north, however the direction has become rather variable early this afternoon. The high so far today is 79F, 2 degrees below the daily normal maximum of 81F. The low so far today is 62F, which is 1 degree below the daily normal minimum of 63F. ----------------------------------------------- Today's Observations: 7 A.M. Weather: Clear, few cirrus all quadrants Temperature: 66F; Dew Point: 55F; Relative Humidity: 69% Wind: NNW @ 7 kts Sea-level pressure: 30.21 in. Hg; rising, then more slowly Visibility: 70 miles 6-hr Max temp: 69F 6-hr Min temp: 62F 24-hr Precip: Trace BHO SA 1155 CLR 70 229/66/55/3307/021/ FEW CI ALQDS/ 8/001 51016 70000 10069 20062 10 A.M. Weather: Thin scattered cirrus Temperature: 74F; Dew Point: 55F; Relative Humidity: 51% Wind: N @ 5 kts, wind light Sea-level pressure: 30.21 in Hg; rising, then falling Visibility: 70 miles 3-hr Precip: 0.00 ins. BHO SA 1455 250 -SCT 70 231/74/55/3505/021/ WND LGT/ 8/001 53002 1 P.M. Weather: Thin broken cirrus, few small cumulus distant S-W-N Temperature: 76F, Dew point: 54F; Relative Humidity: 47% Wind: WNW @ 6 kts, wind SW variable NNW Sea-level pressure: 30.20 in Hg; falling steadily Visibility: 70 miles 6-hr Max temp: 79F 6-hr Min temp: 66F 6-hr Precip: 0.00 ins. BHO SA 1755 E250 -BKN 70 227/76/54/2906/020/ FEW SML CU DSNT S-W-N WND 22V33/ 8/101 57004 10079 20066 SUMMARY FOR SATURDAY, AUGUST 14, 2021 TEMPERATURE (DEGREES F) MAX.......87     NORMAL.....81 MIN.......69     NORMAL.....63 MEAN......78     NORMAL.....72 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL.......... +6 TOTAL DEPARTURE FOR THE MONTH......................+12 [+0.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY................0  DEPARTURE.........0 TOTAL HEATING UNITS FOR THE MONTH................0  DEPARTURE........-3 TOTAL HEATING UNITS FOR THE SEASON..............28  DEPARTURE.......+18 TOTAL HEATING UNITS LAST SEASON TO DATE..........1  DEPARTURE.......+27 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY...............13  DEPARTURE........+6 TOTAL COOLING UNITS FOR THE MONTH..............117  DEPARTURE.......+10 TOTAL COOLING UNITS FOR THE SEASON.............496  DEPARTURE........+3 TOTAL COOLING UNITS LAST SEASON TO DATE........672  DEPARTURE......-176 PEAK WIND GUST (MPH):                      Official...................25 W   @  3:09 P.M.                      AEROVANE (south tower).....25 NNW @  8:21 P.M.                      VECTOR #2 (south tower)....27     @  3:09 P.M.                      DAVIS #2 (south tower).....26 W   @  3:10 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..................17 W   @  2:45 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............18     @  3:09 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............18 W   @  3:10 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...... 9.0 W  [217 total miles]                      VECTOR #2................ 9.9                      DAVIS #2................. 9.8 WNW                      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....-0.13 TOTAL PRECIPITATION FOR THE MONTH.............2.76  DEPARTURE....+0.93 TOTAL PRECIPITATION FOR THE YEAR.............37.73  DEPARTURE....+5.46 PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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 08/01   77/58/68/-5/T/589/68             23 SSW AERO 24 SSW RMY N/A 08/02   78/61/70/-3/T/821/95             28 WNW AERO 28 WNW RMY N/A 08/03   76/60/68/-5/0.00/302/35          15 N   AERO 16 N   RMY N/A 08/04   75/61/68/-5/0.71/077/09          21 ESE AERO 21 ESE RMY N/A 08/05   68/61/65/-8/1.68/000/00          28 NE  AERO 28 NE  RMY N/A 08/06   85/62/74/+1/0.00/727/85          19 S   AERO 20 WSW RMY N/A 08/07   88/66/77/+4/0.00/520/61          23 SW  AERO 23 SW  RMY N/A 08/08   80/67/74/+2/T/128/15             16 SW  AERO 16 WNW RMY N/A 08/09   75/64/70/-2/0.25/076/09          22 ENE AERO 21 NE  RMY N/A 08/10   78/63/71/-1/0.12/.../..          19 S   AERO 20 S   RMY N/A 08/11   89/70/80/+8/0.00/.../..          29 SSW AERO 28 SSW RMY N/A 08/12   91/71/81/+9/T/.../..             36 WSW AERO 37 WSW RMY N/A TSTM 08/13   92/73/83/+11/0.00/.../..         18 WSW AERO 18 WSW RMY N/A 08/14   87/69/78/+6/T/.../..             25 W   AERO 25 NNW RMY N/A 08/15   The low since midnight is 62F, the daily normal low is 63F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR AUGUST 15 HIGH 95F IN 1928 LOW 47F IN 1964 PRECIP 1.89 INCHES IN 2011 PEAK GUST 44e MPH S IN 1941 RECORDS FOR AUGUST 16 HIGH 95F IN 1944 LOW 50F IN 1927 PRECIP 1.31 INCHES IN 1951 PEAK GUST 45e MPH N IN 1951 TODAY'S REPORT PREPARED BY: Matt Douglas