BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, SEPTEMBER 13, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME ANOTHER COOL AND FAIR WEATHER DAY WITH WIND PICKING UP SLIGHTLY IN THE AFTERNOON.... Today we observed mostly cloudy skies, which opened up a little more in the afternoon. Visibility was limited to 10 miles this morning from fog, but increased to 65 miles by the 1 P.M. observation. Pressure has dropped by more than 5 millibars in the past 6 hours, which is odd considering there are less clouds now than earlier. It is surely drier at the hill now, with a dew point in the mid 50's and a relative humidity of 50%. The high since midnight is 74F, a degree above the daily normal max of 73F. The low since midnight is 53F, which is 3 degrees below the normal low of 56F. PRELIMINARY STATS FOR AUGUST 2020 TEMPERATURE, Deg. F Avg. Max. 82.5 [+3.3] Avg. Min. 64.3 [+2.5] Mean      73.4 [+2.9] 24-hour corrected mean: 72.3 Max. for month: 94F on the 10th Min. for month: 54F on the 31st HEATING DEGREE DAYS Total heating units:     2 [-14] Total for the season:    3 [-22] Total for last season:  12 COOLING DEGREE DAYS Total cooling units:    270  [+84] Total for the season:   757  [+220] Total for last season:  622 PRECIPITATION, Inches Total: 3.74 [-0.29] Greatest in 24 hrs: 2.21 ins. on the 23rd WIND, mph Avg. uncorrected wind speed: 10.0 mph Avg. corrected wind speed:   10.6 mph Prevailing wind direction:   SSW [12%] Peak gust and direction:     67 SSE on the 4th SUNSHINE: Campbell-Stokes card minutes: 15366 minutes of a possible 24780 or 62% Astronomical total minutes: 15940 minutes of a possible 25709 or 62% Today's Observations: 7 A.M. Weather: Broken stratocumulus and cirrus Temperature: 57F; Dew Point: 56F; Relative Humidity: 95% Wind: NNE at 3 kts, light and variable Sea-level pressure: 30.24 ins. Hg: rising, then falling Visibility: 10 miles, thin fog 6-hr Max temp: 57F 6-hr Min temp: 53F 24-hr Precip: 0.00 ins. BHO SA 1155 35 BKN 250 BKN 10 242/57/56/1503/024/ THN FG ALQDS WND L/V/ 8/701 55001 10057 20053 10 A.M. Weather: Broken cumulus and cirrus Temperature: 67F; Dew Point: 57F; Relative Humidity: 71% Wind: SSE at 7 kts Sea-level pressure: 30.19 ins. Hg: falling steadily Visibility: 35 miles 3-hr Precip: 0.00 ins. BHO SA 1455 35 BKN 250 BKN 35 227/67/57/1607/019/ HAZY/ 8/701 57015 1 P.M. Weather: Scattered cumulus, scattered cirrostratus Temperature: 73F; Dew Point: 55F; Relative Humidity: 54% Wind: S at 11G18 kts Sea-level pressure: 30.10 ins. Hg: falling, then more rapidly Visibility: 65 miles 6-hr Max temp: 74F 6-hr Min temp: 57F 6-hr Precip: 0.00 ins. BHO SA 1755 35 SCT 250 SCT 65 197/73/55/1911G18/010/ 8/105 58030 10074 20057 SUMMARY FOR SATURDAY, SEPTEMBER 12, 2020 TEMPERATURE (DEGREES F) MAX.....68   NORMAL.....73 MIN.....51   NORMAL.....56 MEAN....60   NORMAL.....65 DEPARTURE FROM 30-YEAR NORMAL................ -5 TOTAL DEPARTURE FOR THE MONTH................ +19 [+2.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............5  DEPARTURE......+2 TOTAL HEATING UNITS FOR THE MONTH..............7  DEPARTURE.....-17 TOTAL HEATING UNITS FOR THE SEASON............10  DEPARTURE.....-39 TOTAL HEATING UNITS LAST SEASON TO DATE.......32  DEPARTURE.....-23 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY............  0  DEPARTURE......-2                   TOTAL COOLING UNITS FOR THE MONTH............ 48  DEPARTURE.....+11 TOTAL COOLING UNITS FOR THE SEASON...........805  DEPARTURE....+237 TOTAL COOLING UNITS LAST SEASON TO DATE......642  DEPARTURE....+163 PEAK WIND GUST FOR YESTERDAY (MPH)                    420C/Official................21 ENE AT 11:04 A.M.                      AERO.........................21 ENE AT 11:12 A.M.                    ASOS.........................22 ENE AT 10:12 A.M.                    DAVIS........................22 E   AT 11:02 A.M.                    RMY 21  MERLIN 21 FASTEST MILE FOR YESTERDAY......................16 ENE AT 10:16 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................16 ENE AT 10:12 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................16 E   AT 10:12 A.M. AVERAGE WIND SPEED AND DIRECTION...............9.5 NNE                             ASOS........................9.5                    DAVIS.......................10.1 E [86 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..........0.52  DEPARTURE....-0.96                          ASOS..............0.51 TOTAL PRECIPITATION FOR THE YEAR..........33.33  DEPARTURE....-3.17                          ASOS.............34.09 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/+5/0.00/866/100            18 S    AERO 21 S    RMY 19 08/02  85/69/77/+5/0.02/320/37             36 S    AERO 37 S    RMY 38 08/03  91/75/83/+11/0.00/715/83            36 WSW  AERO 38 SW   RMY 36 08/04  83/71/77/5/0.21/094/11              67 SSE  AERO 71 S    RMY 70 08/05  90/68/79/+7/0.00/668/78             28 SW   AERO 30 SW   RMY 29 08/06  84/65/75/3/0.00/701/82   20 W    AERO 17 W    RMY 19 08/07  79/65/72/0/T/136/16                 16 NE   AERO 16 NE   RMY N/A 08/08  83/64/74/+2/0.00/612/72             20 S    AERO 20 S    RMY 19 08/09  90/65/78/+6/0.00/661/78             26 SSW  AERO 26 SSW  RMY 26 08/10  94/69/82/+11/0.00/727/86            22 W    AERO 20 W    RMY 20 08/11  92/72/82/+11/0.00/708/84            31 SSW  AERO 35 SSW  RMY 31  TSTM 08/12  93/74/84/+13/0.00/647/77            22 SSW  AERO 22 SW   RMY 19 08/13  88/71/80/+9/0.00/528/63             18 ENE  AERO 18 NE   RMY 18 08/14  82/67/75/+4/0.00/618/74             23 ENE  AERO 23 ENE RMY N/A 08/15  67/62/65/-6/T/000/00                33 NNE  AERO 32 NNE  RMY N/A 08/16  69/62/66/-5/0.34/000/00             26 ENE  AERO 28 ENE  RMY 26 08/17  73/59/66/-5/0.04/339/41             25 NE   AERO 24 NE   RMY N/A 08/18  84/63/74/+3/0.23/784/95             23 W    AERO 23 W    RMY 24 08/19  81/59/70/0/0.03/526/64              26 W    AERO 28 W    RMY 27 08/20  80/56/68/-2/0.00/804/98             22 W    AERO 21 W    RMY 22 08/21  88/61/75/+5/0.00/719/88             28 SW   AERO 26 SW   RMY 28 08/22  85/66/76/+6/0.26/521/64             18 NNE  AERO 16 S    RMY 16 08/23  89/63/76/+6/2.21/552/68             60 WNW  AERO 53 WNW  RMY 58  TSTM HAIL 08/24  87/67/77/+7/0.00/493/61             18 S    AERO 18 S    RMY 19  TSTM 08/25  86/65/76/+7/0.01/492/61             35 NNW  AERO 37 NNW  RMY 35 08/26  74/56/65/-4/0.00/780/97             29 NW   AERO 32 NW   RMY N/A 08/27  68/57/63/-6/0.33/008/01             18 SSE  AERO 20 SSE  RMY 20  TSTM 08/28  80/59/70/+1/0.00/559/70             20 W    AERO 20 W    RMY N/A 08/29  74/65/70/+1/0.06/000/00             32 W    AERO 32 W    RMY N/A 08/30  75/57/66/-2/0.00/793/100            36 W    AERO 36 W    RMY N/A 08/31  75/54/65/-3/0.00/569/72             20 S    AERO 20 S    RMY 20 DAILY RECORDS FOR AUGUST 2020 8/23/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 89F,          BREAKS PREVIOUS RECORD of 88F SET IN 1918, 1947, 1949, 1996 8/23/20: DAILY RECORD PRECIPITATION OF 2.21 INS,          BREAKS PREVIOUS RECORD OF 2.09 INS SET IN 2010 8/23/20: DAILY RECORD PEAK WIND GUST OF 60 MPH,          TIES PREVIOUS RECORD OF 60 MPH SET IN 1940 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  76/59/68/0/0.00/.../..              22 SSE  AERO 21 SE   RMY 20 09/02  69/59/64/-4/.../.../..              23 SSE  AERO 23 SSE  RMY 24 09/03  75/66/71/+4/.../.../..              22 SSW  AERO 21 SSW  RMY n/a 09/04  82/62/72/+5/0.00/.../..             26 WNW  AERO 26 WNW  RMY 25 09/05  76/55/66/-1/0.00/.../..             25 W    AERO 25 W    RMY 24 09/06  78/58/68/+1/0.00/.../..             24 W    AERO 24 W    RMY n/a 09/07  79/61/70/+4/0.00/.../..             27 SSE  AERO 30 SSE  RMY 28 09/08  82/61/72/+6/0.00/.../..             17 S    AERO 16 S    RMY 17 09/09  80/62/71/+5/0.00/.../..             16 S    AERO 15 S    RMY 16 09/10  81/69/75/+10/0.29/.../..            21 SSW  AERO 21 SSW  RMY n/a 09/11  72/55/64/-1/0.01/.../..             25 N    AERO 25 N    RMY N/A 09/12  68/51/60/-5/0.00/.../..             21 ENE  AERO 21 ENE  RMY 21 09/13 The low since midnight is 53F, the daily normal low is 56F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR SEPTEMBER 13 HIGH 91F IN 1957 LOW 40F IN 1985 PRECIP 3.10 INCHES IN 1987 PEAK GUST 44 MPH WNW IN 1986 RECORDS FOR SEPTEMBER 14 HIGH 90F IN 1931 LOW 34F IN 1911 PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944) PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944) TODAY'S REPORT PREPARED BY: Benjamin Turner