BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, JULY 24, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0429E SUNSET:  1912E A COOLER DAY WITH MOSTLY CLEAR SKIES AND GOOD VISIBILITY.... Today we observed mostly clear skies save a few cumulus that seemed to be building slightly at the 1 P.M. observation. Visibility was a good 70 miles, which is higher than usual for this time of summer. Wind is on the lighter side, but has shifted from NW to E over the course of the day. The daily highest speed as of yet is 15 mph. The high so far today is 79F, 3 degrees below the daily normal maximum of 82F. The low so far today is 59F, which is 5 degrees below the daily normal minimum of 64F. ----------------------------------------------- Today's Observations: 7 A.M. Weather: Clear Temperature: 65F; Dew Point: 57F; Relative Humidity: 74% Wind: SSW @ 8 kts Sea-level pressure: 30.09 in. Hg; rising steadily Visibility: 70 miles, thin smoke layer 6-hr Max temp: 65F 6-hr Min temp: 59F 24-hr Precip: 0.00 ins. BHO SA 1155 CLR 70 191/65/57/2008/009/ THN K LYR ALQDS/ 53006 10065 20059 10 A.M. Weather: Clear, few cumulus E-NW Temperature: 73F; Dew Point: 58F; Relative Humidity: 59% Wind: SSW @ 6 kts, wind light Sea-level pressure: 30.11 in Hg; rising, then steady Visibility: 70 miles 3-hr Precip: 0.00 ins. BHO SA 1455 CLR 70 199/73/58/2006/011/ FEW CU E-NW WND LGT/ 8/100 53008 1 P.M. Weather: Clear, few cumulus E-N Temperature: 77F, Dew point: 53F; Relative Humidity: 44% Wind: ENE @ 6 kts, wind light   Sea-level pressure: 30.08 in Hg; Falling, then falling more rapidly Visibility: 70 miles 6-hr Max temp: 77F 6-hr Min temp: 65F 6-hr Precip: 0.00 ins. BHO SA 1755 CLR 70 190/77/53/0706/008/ FEW CU E-N WND LGT/ 8/100 58009 10077 20065 SUMMARY FOR FRIDAY, JULY 23, 2021 TEMPERATURE (DEGREES F) MAX.......79     NORMAL.....82 MIN.......62     NORMAL.....64 MEAN......71     NORMAL.....73 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL..........-2 TOTAL DEPARTURE FOR THE MONTH.....................-86 [-3.9 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...............26  DEPARTURE.......+21 TOTAL HEATING UNITS FOR THE SEASON..............26  DEPARTURE.......+21 TOTAL HEATING UNITS LAST SEASON TO DATE..........1  DEPARTURE.......+25 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY................6  DEPARTURE........-3 TOTAL COOLING UNITS FOR THE MONTH..............114  DEPARTURE.......-67 TOTAL COOLING UNITS FOR THE SEASON.............340  DEPARTURE.......+20 TOTAL COOLING UNITS LAST SEASON TO DATE........370  DEPARTURE.......-30 PEAK WIND GUST (MPH):                      Official...................22 S   @  6:08 P.M.                      AEROVANE (south tower).....21 S   @  6:08 P.M.                      VECTOR #2 (south tower)....23     @  6:08 P.M.                      DAVIS #2 (south tower).....23 S   @  6:08 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..................14 S   @  6:08 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............15     @  6:05 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............16 S   @  6:05 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...... 6.8 NW [163 total miles]                      VECTOR #2................ 7.6                      DAVIS #2................. 7.2 NNW                      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.......0.00  DEPARTURE....-0.11 TOTAL PRECIPITATION FOR THE MONTH............10.68  DEPARTURE....+8.13 TOTAL PRECIPITATION FOR THE YEAR.............34.06  DEPARTURE....+4.54 PRELIMINARY CLIMATE SUMMARY FOR JULY 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 07/01   80/65/73/+2/0.74/155/17           22 W   AERO 20 WSW  RMY 21 07/02   65/55/60/-11/1.49/000/00          37 NE  AERO 36 NE   RMY 39 07/03   56/54/55/-17/1.98/000/00          41 NE  AERO 44 NE   RMY 45 TSTM 07/04   66/54/60/-12/0.16/191/21          26 ENE AERO 23 ENE  RMY 26 07/05   74/53/64/-8/0.01/546/60           26 SSW AERO 28 SSW  RMY 27 07/06   87/66/77/+5/0.26/255/28           37 W   AERO 48 W    RMY 38 TSTM 07/07   88/88/77/+5/0.77/699/77           63 NW  AERO 75 NW   RMY 70 TSTM 07/08   67/59/63/-9/0.38/109/12           46 W   AERO 46 W    RMY 51 TSTM 07/09   73/62/68/-5/3.02/163/18           40 WNW AERO 44 WNW  RMY 43 07/10   71/63/67/-6/0.07/109/12           23 NE  AERO 21 NNE  RMY 22 07/11   81/61/71/-2/T/325/36              21 SW  AERO 19 S    RMY N/A 07/12   67/61/64/-9/1.01/000/00           31 ENE AERO 31 ENE  RMY N/A 07/13   66/60/63/-10/0.02/000/00          19 E   AERO 18 E    RMY N/A 07/14   80/62/71/-2/0.01/.../..           19 S   AERO 18 S    RMY N/A 07/15   88/67/78/+5/0.00/.../..           19 WSW AERO 18 SSW  RMY N/A 07/16   90/70/80/+7/0.04/.../..           36 NNW AERO 39 NNW  RMY N/A TSTM 07/17   78/64/71/-2/0.34/.../..           26 ENE AERO 25 ENE  RMY N/A TSTM 07/18   74/63/69/-4/0.15/.../..           22 NE  AERO 22 NE   RMY N/A TSTM 07/19   71/63/67/-6/0.07/.../..           17 ENE AERO 17 ENE  RMY N/A 07/20   83/64/74/+1/0.00/.../..           23 NW  AERO 23 NW   RMY N/A 07/21   79/62/71/-2/..../.../..           26 NNW AERO 23 NNW  RMY N/A TSTM 07/22   79/58/69/-4/..../.../..           20 WNW AERO 20 WNW  RMY N/A TSTM 07/23   79/62/71/-2/..../.../..           22 S   AERO 21 S    RMY N/A TSTM 07/24 The low since midnight is 59F, the daily normal low is 64F RECORDS FOR JULY: JULY 2: Record daily precipitation of 1.49",         Surpasses previous record of 1.42" set in 1986 JULY 3: Record daily precipitation of 1.98",         Surpasses previous record of 1.36" set in 1985 JULY 7: Record peak gust of 63 MPH,         Surpasses previous record of 55 MPH set in 1989 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR JULY 24 HIGH 96F IN 1987 LOW 49F IN 1893,1912 PRECIP 2.27 INS IN 2008 PEAK GUST 46 MPH NE IN 2009 RECORDS FOR JULY 25 HIGH 96F IN 2016 LOW 51F IN 1901,1953 PRECIP 2.25 INS IN 1990 PEAK GUST 88 MPH NW IN 1972 TODAY'S REPORT PREPARED BY: Benjamin Turner