BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA MONDAY, OCTOBER 19, 2020 ALL TIMES ARE IN EASTERN STANDARD TIME A NICE FALL DAY WITH LIMITED VISIBILITY ATOP GREAT BLUE HILL.... Today we observed a limited visibility due to some patchy ground fog, then a smoke layer later on in the day. This yielded a visibility of only 30 miles on average. Wind is northeasterly, with a max gust of only 12 mph and an average speed barely exceeding 5 mph. Weather conditions are similar to yesterday, with the sky being covered by primarily translucent and high clouds.   The high so far today is 61F, 2 degrees above the daily normal minimum of 59F. The low since midnight is 47F, 5 degrees above the normal low of 42F. Today's Observations: 7 A.M. Weather: Broken cirrostratus Temperature: 47F; Dew Point: 43F; Relative Humidity: 86% Wind: ESE at 7 kts Sea-level pressure: 30.41 ins. Hg: rising, then more slowly Visibility: 25 miles, patchy fog 6-hr Max temp: 47F 6-hr Min temp: 47F 24-hr Precip: 0.00 ins. BHO SA 1155 250 BKN 25 297/47/43/1207/041/ PTCHY F ALQDS/ 8/008 52004 10047 20047 10 A.M. Weather: Broken cirrostratus Temperature: 57F; Dew Point: 46F; Relative Humidity: 67% Wind: E at 4 kts, light and variable Sea-level pressure: 30.42 ins. Hg: falling then rising Visibility: 30 miles, thin smoke layer 3-hr Precip: 0.00 ins. BHO SA 1455 250 BKN 30 299/57/46/0904/042/ THN K LYR ALQDS WND L/V/ 8/008 51002 1 P.M. Weather: Scattered cumulus and altocumulus, broken cirrostratus Temperature: 60F; Dew Point: 47F; Relative Humidity: 62% Wind: NE at 7 kts Sea-level pressure: 30.37 ins. Hg: falling steadily Visibility: 30 miles, thin smoke layer 6-hr Max temp: 61F 6-hr Min temp: 47F 6-hr Precip: 0.00 inches BHO SA 1755 55 SCT 140 SCT 250 BKN 30 283/60/47/0507/037/ THN K LYR ALQDS/ 8/178 58016 10061 20047 SUMMARY FOR SUNDAY, OCTOBER 18, 2020 TEMPERATURE (DEGREES F) MAX.....60   NORMAL.....60 MIN.....46   NORMAL.....42 MEAN....53   NORMAL.....51 DEPARTURE FROM 30-YEAR NORMAL.................+2 TOTAL DEPARTURE FOR THE MONTH................+42 [+2.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY.............12  DEPARTURE..... -2 TOTAL HEATING UNITS FOR THE MONTH............159  DEPARTURE.....-47 TOTAL HEATING UNITS FOR THE SEASON...........257  DEPARTURE.....-91 TOTAL HEATING UNITS LAST SEASON TO DATE......292  DEPARTURE.....-35 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...............20 ESE AT  10:24 A.M.                      AEROVANE (south tower)......21 ESE AT  10:21 A.M.                    ASOS........................22 ESE AT  10:42 A.M.                    DAVIS #1....................21 S   AT   9:41 A.M.                    DAVIS #2 (south tower)......19 SE  AT   9:22 A.M.                    RMY.........................20                    MERLIN......................21 FASTEST MILE FOR YESTERDAY.....................15 ESE AT  10:24 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................15 ESE AT  10:24 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE..............16 ESE AT  10:24 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE..............15 ESE AT  11:46 A.M. AVERAGE WIND SPEED AND DIRECTION.............8.5 SE [205 total miles]                            ASOS......................8.4                    DAVIS #1..................9.0 SSE  [147 deg.]                    DAVIS #2..................9.3 SSE  [147 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE....-0.16                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........4.14  DEPARTURE....+1.46                          ASOS..............4.13 TOTAL PRECIPITATION FOR THE YEAR..........38.56  DEPARTURE....-3.20                          ASOS.............39.34 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  60/46/53/+2/0.00/.../..             20 ESE  AERO 21 ESE  RMY 20 10/19 The low since midnight is 47F, 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 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 RECORDS FOR OCTOBER 20 HIGH 78F IN 1965,1984 LOW 24F IN 1972 PRECIP 7.10 INCHES IN 1996 (RECORD FOR MONTH) SNOWFALL TRACE IN 1934,1943 PEAK GUST 63 MPH W IN 1966 TODAY'S REPORT PREPARED BY: Benjamin Turner