BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, JULY 10, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0417E SUNSET:  1922E OVERCAST WITH A COOL BREEZE FOLLOWING A DAY OF RECORD RAINFALL.... Today we measured an additional 2.89 inches of rainfall for the 24 hours ending at 7 AM this morning, partly due to Tropical Storm Elsa yesterday. This amount brings the monthly total to 8.88 inches, 7.90 inches above the current average through the 9th. Drought fears are a distant memory, as the yearly total of 32.26 inches exceeds the normal by almost 4 and a half inches. The peak wind gust during Elsa was 40 mph from the WNW at 2:54 PM EST after the center of the storm passed to the asst. Today we observed overcast skies with a limited visibility of 30 miles. While cool, humidity remains a factor with dew points in the upper 50's. A steady northeast wind persists with an average speed of 10 mph and a gust of 21 mph. Here's some more context for the tropical rain yesterday including the list of most rainfall on July 9th and the list of wettest calendar days in July.  Only one other day on these lists appears to have been from a tropical cyclone. BHO Highest July 9 Precipitation, inches (1885-2021): 1) 3.74 on July 9, 1921 2) 3.02 on July 9, 2021 3) 1.37 on July 9, 1964 4) 1.17 on July 9, 1962 5) 1.10 on July 9, 1895 6) 0.92 on July 9, 1930 BHO Highest July Calendar Day Precipitation, inches (1885-2021): 1) 4.46 on July 1, 1915 2) 4.01 on July 27, 1979 3) 3.74 on July 9, 1921 4) 3.54 on July 13, 1996 [T.S. Bertha] 5) 3.32 on July 28, 1911 6) 3.14 on July 13, 1898 7) 3.02 on July 9, 2021 [T.S. Elsa] 8) 2.92 on July 27, 1988 ~via BHO Chief Scientist Mike Iacono The high so far today is 70F, 12 degrees below the daily average of 82F. The low so far today is 60F, 4 degrees below the daily average of 64F. ----------------------------------------------- PRELIMINARY STATS FOR JUNE 2021 TEMPERATURE, Deg. F Avg. Max. 80.9 [+5.9] Avg. Min. 60.4 [+3.3] Mean      70.7 [+4.6] 24-hour corrected mean: 70.0 Max. for month: 95F on the 29th Min. for month: 50F on the 1st HEATING DEGREE DAYS Total heating units:     19 [-54] Total for the season:  5597 [-725] Total for last season: 5852 COOLING DEGREE DAYS Total cooling units:     197 [+92] Total for the season:    226 [+97] Total for last season:   184 PRECIPITATION, Inches Total: 2.72 [-1.59] Greatest in 24 hrs: 0.68 inches on the 22nd WIND, mph Avg. uncorrected wind speed: 10.4 mph Avg. corrected wind speed:   10.9 mph Prevailing wind direction:   SSW [22%] Peak gust and direction:     51 NW on the 30th SUNSHINE: Campbell-Stokes card minutes: 16230 minutes of a possible 26376 or 62% Astronomical total minutes: 16866 minutes of a possible 27415 or 62% Today's Observations: 7 A.M. Weather: Scattered stratocumulus, broken altocumulus Temperature: 66F; Dew Point: 64F; Relative Humidity: 93% Wind: NE @ 05G12kts Sea-level pressure: 29.98 in. Hg; rising, then more rapidly Visibility: 20 miles, thin fog 6-hr Max temp: 69F 6-hr Min temp: 64F 24-hr Precip: 2.89 ins. BHO SA 1155 30 SCT 90 BKN 20 152/66/64/0505G12/998/ BINOVC THN F ALQDS/ 8/870 70289 51014 10069 20064 10 A.M. Weather: Scattered stratocumulus, overcast altocumulus Temperature: 65F; Dew Point: 59F; Relative Humidity: 80% Wind: ENE @ 10G19 kts Sea-level pressure: 30.01 in Hg; rising steadily Visibility: 30 miles, hazy 3-hr Precip: 0.00 ins. BHO SA 1455 30 SCT 90 OVC 30 162/65/59/0610G19/001/ HAZY/ 8/870 53010 1 P.M. Weather: Overcast stratocumulus Temperature: 69F, Dew point: 57F; Relative Humidity: 65% Wind: ENE @ 6G14 kts Sea-level pressure: 30.02 in Hg; falling steadily Visibility: 35 miles, hazy 6-hr Max temp: 71F 6-hr Min temp: 65F 6-hr Precip: 0.00 ins. BHO SA 1755 30 OVC 35 165/69/57/0606G14/002/ HAZY/ 8/8// 53003 10071 20065 SUMMARY FOR FRIDAY, JULY 9, 2021 TEMPERATURE (DEGREES F) MAX.......73     NORMAL.....82 MIN.......62     NORMAL.....64 MEAN......68     NORMAL.....73 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL..........-5 TOTAL DEPARTURE FOR THE MONTH.....................-50 [-5.8 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...............23  DEPARTURE.......+20 TOTAL HEATING UNITS FOR THE SEASON..............23  DEPARTURE.......+20 TOTAL HEATING UNITS LAST SEASON TO DATE..........0  DEPARTURE.......+23 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY................3  DEPARTURE.......-5 TOTAL COOLING UNITS FOR THE MONTH...............35  DEPARTURE......-30 TOTAL COOLING UNITS FOR THE SEASON.............261  DEPARTURE......+57 TOTAL COOLING UNITS LAST SEASON TO DATE........243  DEPARTURE......+18 PEAK WIND GUST (MPH):                      420C/Official..............40 WNW @ 2:54 P.M.                      VECTOR #1..................42     @ 2:53 P.M.                      RMY........................43     @ 2:46 P.M.                      MERLIN.....................38                      AEROVANE (south tower).....44 WNW @ 3:03 P.M.                      VECTOR #2 (south tower)....42     @ 3:18 P.M.                      DAVIS #1...................37 WNW @ 2:37 P.M.                                           DAVIS #2 (south tower).....37 W   @ 2:37 P.M.                      ASOS...........OUT OF SERVICE D/T RENOVATIONS                       FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................28 NW  @ 2:54 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..............26     @ 2:58 P.M. MAXIMUM 2-MINUTE RMY AVERAGE....................25 NNW @ 3:03 P.M MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............28     @ 2:43 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............28 WNW @ 2:39 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............27 NW  @ 2:39 P.M. AVERAGE WIND SPEED AND DIRECTION:                      CONTACTING/OFFICIAL......12.0 ESE [288 total miles]                      VECTOR #1................12.5                      DAVIS #1.................12.5                                           DAVIS #2.................14.0                      RMY......................11.5 NW                      ASOS.....................OUT OF SERVICE D/T RENOVATIONS                       PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......2.89  DEPARTURE....+2.78 TOTAL PRECIPITATION FOR THE MONTH.............8.88  DEPARTURE....+7.90 TOTAL PRECIPITATION FOR THE YEAR.............32.26  DEPARTURE....+4.31       PRELIMINARY CLIMATE SUMMARY FOR JUNE 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 06/01   74/50/62/0/0.00/425/47            20 WSW  AERO 24 WSW  RMY 22 06/02   80/55/68/+6/0.00/553/61           28 S    AERO 25 S    RMY 28 06/03   73/56/65/+3/0.01/073/08           29 SSW  AERO 29 SSW  RMY 29 06/04   77/61/69/+6/0.02/054/06           23 SW   AERO 25 WSW  RMY 25 TSTM 06/05   87/60/74/+11/0.00/801/88          32 SSW  AERO 37 SSW  RMY 35 06/06   91/69/80/+17/0.00/819/90          30 WSW  AERO 31 WSW  RMY 32 06/07   92/69/81/+17/0.00/838/92          31 SSW  AERO 35 SSW  RMY 34 06/08   92/69/81/+17/0.06/456/50          24 WSW  AERO 25 WSW  RMY 27 TSTM 06/09   88/70/79/+15/0.02/530/58          21 N    AERO 23 NNW  RMY 23 06/10   70/53/62/-3/0.00/795/87           28 NE   AERO 28 NE   RMY 28 06/11   70/51/61/-4/0.13/411/45           21 SSE  AERO 22 SSE  RMY 22 06/12   72/53/63/-2/0.43/430/47           20 WSW  AERO 18 WSW  RMY 20 06/13   82/56/69/+4/0.00/860/94           26 SSW  AERO 29 SSW  RMY 29 06/14   65/56/61/-5/0.63/027/03           28 S    AERO 30 SSE  RMY 29 06/15   77/61/69/+3/T/357/39              18 NE   AERO 20 NE   RMY 18 TSTM 06/16   73/56/65/-1/0.00/769/84           27 NNW  AERO 31 NNW  RMY 27 06/17   77/52/65/-2/0.00/880/96           21 WNW  AERO 21 NW   RMY 23 06/18   82/56/69/+2/T/789/86              26 WSW  AERO 28 WSW  RMY 30 06/19   86/63/75/+8/0.09/504/55           30 SW   AERO 32 SW   RMY 32 06/20   85/63/74/+6/0.00/816/89           24 S    AERO 25 SSW  RMY 25 06/21   83/65/74/+6/0.00/514/56           37 SSW  AERO 39 SSW  RMY 39 06/22   84/58/71/+3/0.68/229/25           30 NW   AERO 31 NW   RMY 31 TSTM 06/23   73/52/63/-5/0.00/807/88           25 NW   AERO 24 NW   RMY 26 06/24   76/58/67/-2/T/899/98              25 SE   AERO 24 SE   RMY 25 06/25   71/57/64/-5/0.11/046/05           23 S    AERO 23 S    RMY 23 06/26   81/61/71/+2/0.00/376/41           36 SSW  AERO 37 SSW  RMY 38 06/27   85/70/78/+9/0.00/476/52           38 SW   AERO 39 SW   RMY 42 06/28   93/70/82/+12/0.00/851/93          28 SW   AERO 28 SW   RMY 28 06/29   95/73/84/+14/T/750/82             26 W    AERO 30 W    RMY 27 TSTM 06/30   94/69/82/+12/0.54/731/80          51 NW   AERO 53 NW   RMY 56 TSTM RECORDS FOR JUNE: JUNE 7: Record high minimum temperature of 69F,         Surpasses previous record of 66F set in 1922 and 1953 JUNE 29: Record high maximum temperature of 95F,         Surpasses previous record of 94F set in 1933 JUNE 29: Record high minimum temperature of 73F,         Surpasses previous record of 71F set in 1999 JUNE 30: Record high maximum temperature of 94F,         Ties previous record of 94F set in 1964 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/.../..           22 W   AERO 20 WSW  RMY 21 07/02   65/55/60/-11/1.49/.../..          37 NE  AERO 36 NE   RMY 39 07/03   56/54/55/-17/1.98/.../..          41 NE  AERO 44 NE   RMY 45 TSTM 07/04   66/54/60/-12/0.16/.../..          26 ENE AERO 23 ENE  RMY 26 07/05   74/53/64/-8/0.01/.../..           26 SSW AERO 28 SSW  RMY 27 07/06   87/66/77/+5/0.26/.../..           37 W   AERO 48 W    RMY 38 TSTM 07/07   88/88/77/+5/0.77/.../..           63 NW  AERO 75 NW   RMY 70 TSTM 07/08   67/59/63/-9/0.38/.../..           46 W   AERO 46 W    RMY 51   07/09   73/62/68/-5/3.02/.../..           40 WNW AERO 44 WNW  RMY 43 07/10   The low since midnight is 64F, 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 10 HIGH 99F IN 1911 LOW 46F IN 1890 PRECIP 1.95 INS IN 2015 WIND 75 MPH W IN 1985 RECORDS FOR JULY 11 HIGH 98F IN 1911 LOW 49F IN 1890 PRECIP 1.87 INS IN 1959 WIND 53 MPH NW IN 1988 TODAY'S REPORT PREPARED BY: Benjamin Turner