BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, AUGUST 12, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME DAY FOUR OF HEAT WAVE ON TOP OF GREAT BLUE HILL.... Today was another abnormally hot day on top of Great Blue, making day four of our heat wave. The high temperature so far was 92F right around the 1 o'clock EST observation, matching yesterday's high temperature. Visibility today was better than it has been with Monadnock visible after the 10 o'clock EST observation. Humidity has been dropping through the day which corresponded with a decrease in haze in all directions. After 1 o'clock, cumulus clouds have been gaining height, improving chances for a shower or storm later on today. Cloud cover has also increased as the day progressed. PRELIMINARY STATS FOR JULY 2020 TEMPERATURE, Deg. F Avg. Max. 83.5 [+2.7] Avg. Min. 66.0 [+3.1] Mean      74.8 [+2.9] 24-hour corrected mean: 73.6 Max. for month: 95F on the 28th Min. for month: 57F on the 16th COOLING DEGREE DAYS Total cooling units:    303  [+81] Total for the season:   487  [+136] Total for last season:  411 PRECIPITATION, Inches Total: 1.72 [-2.30] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 9.1 mph Avg. corrected wind speed:   9.8 mph Prevailing wind direction:   S [12%] Peak gust and direction:     39 S on the 11th SUNSHINE: Campbell-Stokes card minutes: 15300 minutes of a possible 26682 or 57% Astronomical total minutes: 15879 minutes of a possible 27720 or 57% Today's Observations: 7 A.M. Weather: Few cumulus S-SE, scattered altocumulus, scattered cirrostratus Temperature: 76F; Dew Point: 70F; Relative Humidity: 82% Wind: SW at 7 kts Sea-level pressure: 30.01 ins. Hg: Falling then steady Visibility: 30 miles, hazy 6-hr Max temp: 76F 6-hr Min temp: 74F 24-hr Precip: 0.00 ins. BHO SA 1155 140 SCT 300 SCT 30 164/76/70/2607/001/ FEW CU S-SE HAZY/ 8/136 53015 10076 20074 10 A.M. Weather: Scattered altocumulus, scattered cirrostratus Temperature: 86F; Dew Point: 65F; Relative Humidity: 73% Wind: W at 6 kts Sea-level pressure: 30.01 ins. Hg: Rising then falling Visibility: 70 miles 3-hr Precip: 0.00 ins. BHO SA 1455 150 SCT 250 SCT 70 164/86/65/2606/001/ FEW CU ALQDS/ 8/136 50000 1 P.M. Weather: Broken stratocumulus, broken altocumulus, broken cirrostratus Temperature: 92F; Dew Point: 71F; Relative Humidity: 51% Wind: WNW at 8 kts Sea-level pressure: 30.01 ins. Hg: Falling, then steady Visibility: 70 miles 6-hr Max temp: 92F 6-hr Min temp: 76F 6-hr Precip: 0.00 ins. BHO SA 1755 90 BKN 150 BKN 250 BKN 70 162/92/71/2908/001/ 8/435 56002 10092 20076 SUMMARY FOR TUESDAY, AUGUST 11, 2020 TEMPERATURE (DEGREES F) MAX.....92   NORMAL.....80 MIN.....72   NORMAL.....63 MEAN....82   NORMAL.....71 DEPARTURE FROM 30-YEAR NORMAL.................+11 TOTAL DEPARTURE FOR THE MONTH.................+66 [+5.8 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY.................17  DEPARTURE......+10                       TOTAL COOLING UNITS FOR THE MONTH................141  DEPARTURE......+63 TOTAL COOLING UNITS FOR THE SEASON...............628  DEPARTURE.....+199 TOTAL COOLING UNITS LAST SEASON TO DATE..........493  DEPARTURE.....+135 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................31 SSW AT  4:29 P.M.                      AERO.........................35 SSW AT  4:29 P.M.                    ASOS.........................33 S   AT  4:30 P.M.                    DAVIS........................33 S   AT  3:56 P.M                    RMY 31  MERLIN 32 FASTEST MILE FOR YESTERDAY......................24 SSW AT  4:30 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................23 S   AT  3:57 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................22 S   AT  3:57 P.M. AVERAGE WIND SPEED AND DIRECTION............... 12.3 SSW                              ASOS........................ 12.1                    DAVIS....................... 11.2 SSW [204 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.13                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.23  DEPARTURE......-1.36                          ASOS..............0.23 TOTAL PRECIPITATION FOR THE YEAR..........29.30  DEPARTURE......-3.28                          ASOS.............30.04 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  76/63/70/0/0.00/228/25              16 E    AERO 14 E    RMY 14  TSTM 07/02  86/61/74/4/0.00/803/88              30 WSW  AERO 25 WSW  RMY 33 07/03  73/60/67/-4/0.00/091/10             30 NE   AERO 28 NE   RMY 30 07/04  79/60/70/-1/0.00/565/62             16 S    AERO 16 S    RMY 16 07/05  83/63/73/+2/0.54/373/41             24 NW   AERO 30 NW   RMY 26  TSTM 07/06  73/60/67/-4/0.00/482/53             20 ENE  AERO 16 NNE  RMY 18 07/07  78/60/69/-2/0.00/454/50             25 S    AERO 25 S    RMY 26 07/08  83/64/74/+2/0.00/227/25             32 SSW  AERO 32 SSW  RMY 32 07/09  89/70/80/+8/0.00/834/92             24 S    AERO 23 S    RMY 22 07/10  83/70/77/+5/0.05/109/12             30 SSE  AERO 32 SSE  RMY N/A 07/11  85/70/78/+6/0.00/614/68             39 S    AERO 39 S    RMY 38 07/12  86/70/78/+6/0.00/830/92             28 WSW  AERO 28 WSW  RMY 29 07/13  82/69/76/+4/0.23/306/34             30 SSE  AERO 31 SSE  RMY 30  TSTM 07/14  78/63/71/-1/0.00/369/41             26 ENE  AERO 25 ENE  RMY 26   07/15  72/59/66/-6/0.00/539/60             21 NE   AERO 21 NE   RMY N/A 07/16  73/57/65/-7/0.00/815/91             21 E    AERO 21 E    RMY 19 07/17  71/57/64/-8/0.19/027/03             24 SSW  AERO 24 SSW  RMY 25 07/18  89/66/78/+6/0.00/822/92             18 W    AERO 17 W    RMY 19 07/19  92/69/81/+9/0.00/722/81             28 S    AERO 28 S    RMY 26 07/20  91/72/82/+10/T/481/54               25 SSW  AERO 25 SSW  RMY N/A 07/21  88/68/78/+6/0.00/799/90             25 W    AERO 25 W    RMY 24 07/22  80/67/74/+2/..../275/31             16 ENE  AERO M  M    RMY 16 07/23  88/68/78/+6/0.48/203/23             31 N    AERO 32 N    RMY 31  TSTM 07/24  81/68/75/+3/0.00/476/54             15 ENE  AERO 15 ENE  RMY 16 07/25  88/67/78/+6/0.00/845/96             18 W    AERO 18 WNW  RMY N/A 07/26  89/70/80/+8/0.00/632/72             27 W    AERO 28 W    RMY 27 07/27  94/72/83/+11/0.00/823/94            23 SW   AERO 25 SW   RMY N/A 07/28  95/74/85/+13/0.01/621/71            28 WSW  AERO 25 WSW  RMY 25 07/29  90/68/79/+7/0.00/698/80             23 SSW  AERO 25 SSW  RMY 24 07/30  88/71/80/+8/0.00/252/29             29 W    AERO 28 W    RMY 29   07/31  84/69/77/+5/0.00/564/65             14 ENE  AERO 14 ENE  RMY 15 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  87/66/77/+5/0.00/.../..             18 S    AERO 21 S    RMY 19 08/02  85/69/77/+5/0.02/.../..             36 S    AERO 37 S    RMY 38 08/03  91/75/83/+11/0.00/.../..            36 WSW  AERO 38 SW   RMY 36 08/04  83/71/77/5/0.21/.../..              67 SSE  AERO 71 S    RMY 70 08/05  90/68/79/+7/0.00/.../..             28 SW   AERO 30 SW   RMY 29 08/06  84/65/75/3/0.00/.../..              20 W    AERO 17 W    RMY 19 08/07  79/65/72/0/T/.../..                 16 NE   AERO 16 NE   RMY N/A 08/08  83/64/74/+2/0.00/.../..             20 S    AERO 20 S    RMY 19 08/09  90/65/78/+6/0.00/.../..             26 SSW  AERO 26 SSW  RMY 26 08/10  94/69/82/+11/0.00/.../..            22 W    AERO 20 W    RMY 20 08/11  92/72/82/+11/0.00/.../..            31 SSW  AERO 35 SSW  RMY 31  TSTM 08/12  The low since midnight is 74F, the daily normal low is 62F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR AUGUST 12 HIGH 99F IN 1944 LOW 48F IN 1930 PRECIP 1.89 INCHES IN 1979 PEAK GUST 50 MPH NE IN 1983 RECORDS FOR AUGUST 13 HIGH 98F IN 1944, 2002 LOW 47F IN 1902, 1957 PRECIP 2.92 INCHES IN 1989 PEAK GUST 52 MPH SSE IN 1963 TODAY'S REPORT PREPARED BY: Samantha Richard