BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, SEPTEMBER 10, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME WARM, MUDDY AND OVERCAST... The 2 big stories here at the hill today are the warmth and humidity: We have only managed to hit 69 degrees as the low temperature since midnight today. If this holds through the end of the day, this would tie for 2nd highest minimum temperature on record for this date. For interest, 71 degrees remains the top spot - occurring in 2016. The other headline is the anomalously oppressive dew points. They have slowly inched their way upwards from 71 degrees at 7AM to a peak of 73 degrees by late morning. While we do not maintain strict dew point records here at the Observatory, Boston does. Since records commenced there in 1936, a max dew point of 74 degrees today would tie the highest reading so late in the season. 75 degrees would break it. If you are wondering, 77 degrees is the highest September dew point on record for KBOS set on September 3rd, 1993. The average dew point this time of year is 55 degrees -give or take- so we are well beyond that point! Skies have remained predominantly overcast with limited visibility. A sprinkle here and there have been felt in between observations. Winds continue from the south peaking so far at 19 MPH. The high so far today is 80F, 6 degrees above the daily normal max of 74F. The low since midnight is 69F, which is 12 degrees above the normal low of 57F. 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: N/A 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: Vertical visibility 300 feet, sky obscured Temperature: 71F; Dew Point: 71F; Relative Humidity: 100% Wind: S at 7 kts Sea-level pressure: 30.29 ins. Hg: rising unsteadily Visibility: 1/8 mile, fog 6-hr Max temp: 71F 6-hr Min temp: 70F 24-hr Precip: 0.00 ins. BHO SA 1155 W3 X 1/8F 257/71/71/1907/029/ 8/// 52002 10071 20070 10 A.M. Weather: Overcast Stratus Temperature: 76F; Dew Point: 73F; Relative Humidity: 92% Wind: SSW at 7 kts Sea-level pressure: 30.28 ins. Hg: rising, then falling Visibility: 25 miles (distant fog) 3-hr Precip: Trace BHO SA 1455 E11 OVC 25 254/76/73/2107/028/ THN F ALQDS/ 8/6// 58003 6/// 1 P.M. Weather: Scattered Cumulus, Broken Altocumulus, Broken Cirrus Temperature: 79F; Dew Point: 72F; Relative Humidity: 79% Wind: SSW at 7 kts Sea-level pressure: 30.22 ins. Hg: rising, then more rapidly Visibility: 45 miles, hazy 6-hr Max temp: 80F 6-hr Min temp: 71F 6-hr Precip: Trace BHO SA 1755 19 SCT E65 BKN E200 BKN 45 232/79/72/2007/022/ HAZY/ 8/231 58022 6/// 10080 20071 SUMMARY FOR WEDNESDAY, SEPTEMBER 9, 2020 TEMPERATURE (DEGREES F) MAX.....80   NORMAL.....74 MIN.....62   NORMAL.....57 MEAN....71   NORMAL.....66 DEPARTURE FROM 30-YEAR NORMAL................  +5 TOTAL DEPARTURE FOR THE MONTH................ +20 [+2.0 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY............  6  DEPARTURE......+3                   TOTAL COOLING UNITS FOR THE MONTH............ 38  DEPARTURE......+8 TOTAL COOLING UNITS FOR THE SEASON...........795  DEPARTURE....+228 TOTAL COOLING UNITS LAST SEASON TO DATE......634  DEPARTURE....+161 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................16 S  AT  9:59 P.M.                      AERO.........................15 S  AT  8:08 P.M.                    ASOS.........................16 S  AT  8:25 P.M.                    DAVIS........................15 S  AT  8:13 P.M.                    RMY 16  MERLIN 15 FASTEST MILE FOR YESTERDAY......................12 S  AT 10:01 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................13 S  AT 10:01 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................12 S  AT  9:55 P.M. AVERAGE WIND SPEED AND DIRECTION...............6.5 S                             ASOS........................7.3                    DAVIS.......................6.2 SSW [202 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE....-0.12                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.23  DEPARTURE....-0.86                          ASOS..............0.24 TOTAL PRECIPITATION FOR THE YEAR..........33.04  DEPARTURE....-3.07                          ASOS.............33.82 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/..../000/00             26 ENE  AERO 28 ENE  RMY 26 08/17  73/59/66/-5/..../339/41             25 NE   AERO 24 NE   RMY N/A 08/18  84/63/74/+3/..../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 The low since midnight is 69F, the daily normal low is 57F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR SEPTEMBER 10 HIGH 90F IN 1931,1989 LOW 41F IN 1956 PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER) PEAK GUST 48 MPH NW IN 1972 RECORDS FOR SEPTEMBER 11 HIGH 93F IN 1983, 2013 LOW 37F IN 1917 PRECIP 5.23 INCHES IN 1954 (HURRICANE EDNA) PEAK GUST 101 MPH NW IN 1954 (HURRICANE EDNA) TODAY'S REPORT PREPARED BY: Andrew Swanson