BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, OCTOBER 18, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME A COOLER DAY WITH MOSTLY CLOUDY SKIES AND GREAT VISIBILITY.... Today we observed mostly cloudy skies covered by a translucent layer of cirrostratus clouds, which left an uninterrupted burn on the sun card. Wind is south- easterly, with a max gust of 20 mph and an average speed barely exceeding 10 mph. Visibility was between 75 and 80 miles on average, while pressure is very steadily decreasing between the 10 A.M. and 1 P.M. observations. The high so far today is 60F, the same as the daily normal minimum. The low since midnight is 46F, 4 degrees above the normal low of 42F. PRELIMINARY STATS FOR SEPTEMBER 2020 TEMPERATURE, Deg. F Avg. Max. 73.2 [+1.6] Avg. Min. 54.9 [+0.3] Mean      64.1 [+1.0] 24-hour corrected mean: 63.6 Max. for month: 82F on the 8th Min. for month: 39F on the 22nd HEATING DEGREE DAYS Total heating units:    95 [-22] Total for the season:   98 [-44] Total for last season:  93 COOLING DEGREE DAYS Total cooling units:     73  [+13] Total for the season:   830  [+233] Total for last season:  680 PRECIPITATION, Inches Total: 1.61 [-2.45] Greatest in 24 hrs: 1.02 ins. on 29th-30th WIND, mph Avg. uncorrected wind speed: 10.6 mph Avg. corrected wind speed:   11.1 mph Prevailing wind direction:   S [20%] Peak gust and direction:     71 S on the 30th SUNSHINE: Campbell-Stokes card minutes: 12150 minutes of a possible 21582 or 56% Astronomical total minutes: 12593 minutes of a possible 22403 or 56% Today's Observations: 7 A.M. Weather: Broken cirrostratus Temperature: 48F; Dew Point: 34F; Relative Humidity: 57% Wind: SE at 7 kts Sea-level pressure: 30.55 ins. Hg: rising, then more slowly Visibility: 80 miles 6-hr Max temp: 48F 6-hr Min temp: 46F 24-hr Precip: 0.03 ins. BHO SA 1155 250 BKN 80 344/48/34/1407/055/ 8/008 70003 53013 10048 20046 10 A.M. Weather: Broken cirrostratus Temperature: 57F; Dew Point: 37F; Relative Humidity: 47% Wind: SSE at 8G17 kts Sea-level pressure: 30.56 ins. Hg: falling then rising Visibility: 75 miles 3-hr Precip: 0.00 ins. BHO SA 1455 250 BKN 75 347/57/37/1508G17/056/ 8/008 50003 1 P.M. Weather: Broken cirrostratus Temperature: 59F; Dew Point: 34F; Relative Humidity: 38% Wind: ESE at 8G15 kts Sea-level pressure: 30.51 ins. Hg: falling steadily Visibility: 75 miles 6-hr Max temp: 60F 6-hr Min temp: 48F 6-hr Precip: 0.00 inches BHO SA 1755 250 BKN 75 331/59/34/1108G15/051/ 8/008 58016 10060 20048   SUMMARY FOR SATURDAY, OCTOBER 17, 2020 TEMPERATURE (DEGREES F) MAX.....56   NORMAL.....60 MIN.....39   NORMAL.....42 MEAN....48   NORMAL.....51 DEPARTURE FROM 30-YEAR NORMAL.................-3 TOTAL DEPARTURE FOR THE MONTH................+40 [+2.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY.............17  DEPARTURE..... +3 TOTAL HEATING UNITS FOR THE MONTH............147  DEPARTURE.....-45 TOTAL HEATING UNITS FOR THE SEASON...........245  DEPARTURE.....-89 TOTAL HEATING UNITS LAST SEASON TO DATE......276  DEPARTURE.....-31 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY............. 0  DEPARTURE...... 0                   TOTAL COOLING UNITS FOR THE MONTH............. 1  DEPARTURE..... -4 TOTAL COOLING UNITS FOR THE SEASON...........831  DEPARTURE....+229 TOTAL COOLING UNITS LAST SEASON TO DATE......682  DEPARTURE....+149 PEAK WIND GUST FOR YESTERDAY (MPH)                    420C/Official...............35 WNW AT  12:20 P.M.                      AEROVANE (south tower)......40 WNW AT   9:56 A.M.                    ASOS........................35 NW  AT   2:46 A.M.                    DAVIS #1....................36 WNW AT  12:02 P.M.                    DAVIS #2 (south tower)......37 WNW AT   9:58 A.M.                    RMY.........................37                    MERLIN......................34 FASTEST MILE FOR YESTERDAY.....................25 WNW AT  12:03 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................23 WNW AT  12:23 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE..............25 WNW AT  12:23 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE..............26 WNW AT   8:16 A.M. AVERAGE WIND SPEED AND DIRECTION.............12.7 NNW [305 total miles]                            ASOS......................12.2                    DAVIS #1..................12.8 NW  [316 deg.]                    DAVIS #2..................13.2 NW  [320 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03  DEPARTURE....-0.12                          ASOS..............0.03 TOTAL PRECIPITATION FOR THE MONTH..........4.14  DEPARTURE....+1.62                          ASOS..............4.13 TOTAL PRECIPITATION FOR THE YEAR..........38.56  DEPARTURE....-3.04                          ASOS.............39.34 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  76/59/68/0/0.00/698/88              22 SSE  AERO 21 SE   RMY 20 09/02  69/59/64/-4/0.18/102/13             23 SSE  AERO 23 SSE  RMY 24 09/03  75/66/71/+4/0.04/000/00             22 SSW  AERO 21 SSW  RMY N/A 09/04  82/62/72/+5/0.00/763/98             26 WNW  AERO 26 WNW  RMY 25 09/05  76/55/66/-1/0.00/760/98             25 W    AERO 25 W    RMY 24 09/06  78/58/68/+1/0.00/356/46             24 W    AERO 24 W    RMY N/A 09/07  79/61/70/+4/0.00/632/82             27 SSE  AERO 30 SSE  RMY 28 09/08  82/61/72/+6/0.00/545/71             17 S    AERO 16 S    RMY 17 09/09  80/62/71/+5/0.00/214/28             16 S    AERO 15 S    RMY 16 09/10  81/69/75/+10/0.28/015/02            21 SSW  AERO 21 SSW  RMY N/A 09/11  72/55/64/-1/0.01/152/20             25 N    AERO 25 N    RMY N/A 09/12  68/51/60/-5/0.00/666/88             21 ENE  AERO 21 ENE  RMY 21 09/13  74/53/64/0/0.00/611/81              26 SSW  AERO 26 SSW  RMY 26 09/14  74/50/62/-2/0.00/511/68             29 NNW  AERO 33 NNW  RMY 30 09/15  64/44/54/-10/0.00/583/78            18 S    AERO 18 S    RMY N/A 09/16  72/49/61/-2/0.00/603/81             31 SSW  AERO 31 SSW  RMY 31 09/17  76/57/67/+4/0.00/453/61             26 WSW  AERO 28 W    RMY N/A 09/18  64/48/56/-6/0.00/163/22             28 NE   AERO 30 NNW  RMY N/A 09/19  59/42/51/-11/0.00/722/98            23 N    AERO 23 N    RMY N/A 09/20  58/40/49/-13/0.00/602/82            25 NE   AERO 25 NE   RMY 27 09/21  61/41/51/-10/0.00/694/95            29 NE   AERO 27 NE   RMY 29 09/22  63/39/51/-10/0.00/022/03            28 NNW  AERO 30 NNW  RMY 29 09/23  78/50/64/+4/0.00/617/85             31 NW   AERO 32 WNW  RMY 32 09/24  76/57/67/+7/0.00/347/48             20 SW   AERO 18 WSW  RMY 19 09/25  77/57/67/+7/0.00/655/91             18 ENE  AERO 18 WSW  RMY N/A 09/26  77/57/67/+8/0.00/516/72             21 S    AERO 21 S    RMY 21 09/27  79/64/72/+13/0.01/121/17            24 S    AERO 25 S    RMY 24 09/28  78/64/71/+13/0.07/199/28            24 SSE  AERO 24 S    RMY 25 09/29  76/62/69/+11/0.01/234/33            30 S    AERO 30 S    RMY N/A 09/30  72/56/64/+6/1.01/395/56             71 S    AERO 88 S    RMY N/A PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/01  75/56/66/+9/0.00/.../..             28 SW   AERO 28 SW   RMY N/A 10/02  63/49/56/-1/0.02/.../..             20 NW   AERO 21 NW   RMY 20 10/03  65/45/55/-1/0.00/.../..             19 WNW  AERO 19 WNW  RMY 19 10/04  65/45/55/-1/0.00/.../..             17 ESE  AERO 18 ESE  RMY 18 10/05  62/52/57/+1/0.00/.../..             17 ENE  AERO 17 ENE  RMY N/A 10/06  69/51/60/+5/0.00/.../..             28 S    AERO 28 S    RMY 29 10/07  73/50/62/+7/0.14/.../..             76 W    AERO 74 W    RMY 70  TSTM 10/08  61/42/52/-2/0.00/.../..             41 W    AERO 41 W    RMY N/A 10/09  60/37/49/-5/0.00/.../..             25 SSW  AERO 28 SSW  RMY N/A 10/10  75/52/64/+10/0.00/.../..            40 SSW  AERO 40 SSW  RMY 38 10/11  64/47/56/+3/0.00/.../..             32 NNW  AERO 35 NNW  RMY N/A 10/12  52/48/50/-3/T/.../..                28 E    AERO 27 E    RMY N/A 10/13  57/49/53/0/1.74/.../..              32 E    AERO 33 E    RMY N/A 10/14  67/47/57/+5/0.00/.../..             23 WNW  AERO 25 WNW  RMY N/A 10/15  71/50/61/+9/0.00/.../..             43 S    AERO 46 S    RMY 42 10/16  68/48/58/+7/..../.../..             28 S    AERO 30 S    RMY N/A 10/17  56/39/48/-3/..../.../..             35 WNW  AERO 40 WNW  RMY 37 10/18 The low since midnight is 46F, the daily normal low is 42F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR OCTOBER 18 HIGH 82F IN 1908 LOW 26F IN 1939 PRECIP 2.79 INCHES IN 1975 SNOWFALL 3.0 INCHES IN 2009 PEAK GUST 66 MPH S IN 1967 RECORDS FOR OCTOBER 19 HIGH 81F IN 1945 LOW 21F IN 1922 PRECIP 3.64 INCHES IN 1932 SNOWFALL 1.0 INCHES IN 1972 PEAK GUST 66 MPH SSW IN 1967 TODAY'S REPORT PREPARED BY: Benjamin Turner