BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, OCTOBER 20, 2017   ALL TIMES ARE IN EASTERN STANDARD TIME SOUTHWEST WINDS CONTINUE TO BRING DRY WARM  AIR TO GREAT BLUE HILL  With high pressure stalling in the area, clear  and dry conditions continue. Sky remained mostly  clear with a few cirrus clouds at each observation.  The air is drier compared to yesterday, which  made the visibility today near perfect at 80 miles at 10:00 AM EST and 1:00 PM EST. A distant fog  which left the area before 10:00 AM EST kept visibility down to 70 miles at the 7:00 AM EST  observation.  With winds coming from the southwest temperatures  continue to be above seasonable with a high of 67F  by 1:00 PM EST this is 8 degrees above the normal  of 59F for this day. Winds from the SSW have been  light to moderate with gust up to 20 kts (23 MPH.)    Today's Observations: 7 A.M. Weather: Clear, few cirrus in all directions Temperature: 55F; Dew Point: 44F; Wind: W at 12 kts Sea-level pressure: 30.06ins. Hg, rising, then more quickly Visibility: 70 miles distant fog in all directions  6-hr Max temp: 55F 6-hr Min temp: 53F 24-hr precip: 0.00 ins.  BHO SA 1155 CLR 70 179/55/44/2812/006/ FEW CI ALQDS  DSNT FG ALQDS/ 8/001 53015 10055 20053 10 A.M. Weather: Few cirrus SSE  Temperature: 61F; Dew Point: 40F; Wind: NW at 10 kts Sea-level pressure: 30.08 ins. Hg, rising then falling Visibility: 80 miles  BHO SA 1455 CLR 80 185/61/40/3110/008/ FEW CI SSE/  8/001 50006  1 P.M.  Weather: Clear, few cirrus SSE-S  Temperature: 66F; Dew Point: 39F; Wind: WNW at 12G18 kts Sea-level pressure: 30.02 ins. Hg, falling, then more slowly Visibility: 80 miles   6-hr Max temp: 67F  6-hr Min temp: 55F BHO SA 1755 CLR 80 167/66/39/3012G18/002/ FEW CI SSE-S/ 8/001 58018 10067 20055 SUMMARY FOR THURSDAY, OCTOBER 19, 2017   TEMPERATURE (DEGREES F) MAX.....72   NORMAL.....59 MIN.....52   NORMAL.....42 MEAN....62   NORMAL.....50 DEPARTURE FROM 30-YEAR NORMAL........................+12 TOTAL DEPARTURE FOR THE MONTH.......................+137 [+7.0 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE...........0 TOTAL COOLING UNITS FOR THE MONTH..............20   DEPARTURE.........+16 TOTAL COOLING UNITS FOR THE SEASON............727   DEPARTURE........+126 TOTAL COOLING UNITS LAST SEASON TO DATE.......894   DEPARTURE........-167 HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............3   DEPARTURE.........-12 TOTAL HEATING UNITS FOR THE MONTH..............98   DEPARTURE........-123 TOTAL HEATING UNITS FOR THE SEASON............191   DEPARTURE........-172 TOTAL HEATING UNITS LAST SEASON TO DATE.......223   DEPARTURE.........-32 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY...................31  SSW  AT 3:27 P.M.                     AERO........................30  SSW  AT 3:25 P.M.                    ASOS........................34  SSW  AT 3:26 P.M.                    DAVIS.......................33  SSW  AT 2:53 P.M.  RMY 32  FASTEST MILE FOR YESTERDAY.....................25  SSW  AT 3:24 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................24  SSW  AT 7:33 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................25  SSW  AT 3:25 P.M. AVERAGE WIND SPEED AND DIRECTION.............15.1  SSW                    ASOS......................15.1                    DAVIS.....................14.6  SW  [216 DEG.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.50  DEPARTURE......-2.33                          ASOS..............0.50 TOTAL PRECIPITATION FOR THE YEAR..........42.36  DEPARTURE......+0.45                          ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings 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 10/1  65/42/54/-3/0.00/697/99           18 WNW AERO 16 NW  RMY N/A 10/2  65/46/56/-1/0.00/687/98           21 NNW AERO 21 NNW RMY 21 10/3  67/50/59/+3/0.00/677/97           21 S   AERO 21 S   RMY N/A 10/4  75/50/63/+7/0.00/660/95           30 SSW AERO 30 SW  RMY 32 10/5  79/60/70/+14/0.00/429/62          28 SW  AERO 26 SW  RMY N/A 10/6  73/57/65/+10/T/352/51             15 NW  AERO 14 NW  RMY 15 10/7  75/59/67/+12/T/344/50             29 S   AERO 30 SSW RMY N/A 10/8  71/67/69/+15/0.23/007/01          33 S   AERO 36 SSW RMY 37 10/9  71/68/70/+16/0.22/000/00          43 S   AERO 41 S   RMY 45 10/10 76/61/69/+15/0.00/637/94          21 WNW AERO 20 WNW RMY 21  10/11 68/55/62/+9/0.00/122/18           29 ENE AERO 25 ENE RMY 29  10/12 58/48/50/0/T/.../..               30 NE  AERO 28 ENE RMY 30  10/13 64/48/56/+3/0.00/.../..           20 E   AERO 16 E   RMY 17 10/14 66/54/60/+8/.../.../..            15 SSE AERO 13 SSE RMY 13  10/15 72/58/65/+13/.../.../..           39 SSW AERO 36 SSW RMY 40  10/16 66/39/53/+2/.../.../..            28 NNW AERO 25 NNW RMY 29 10/17 57/35/46/-5/0.00/.../..           25 S   AERO 22 S   RMY 25 10/18 70/45/58/+7/0.00/../..            25 SW  AERO 23 SW  RMY 22  10/19 72/52/62/+12/0.00/../..           31 SSW AERO 30 SSW RMY 32 10/20 Low temp since midnight is 53F; normal low is now 42F DAILY RECORDS FOR OCTOBER 10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,          BREAKS PREVIOUS RECORD OF 60F SET IN 1944 10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,          BREAKS PREVIOUS RECORD OF 61F SET IN 2011 10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,          BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990          AND TIED ON OCTOBER 8, 2017 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):       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 RECORDS FOR OCTOBER 21 HIGH 79F IN 1979 LOW 24F IN 1974 PRECIP 2.39 INCHES IN 1944 SNOWFALL TRACE IN 1895,1907,1940 PEAK GUST 69e MPH S IN 1976 TODAY'S REPORT PREPARED BY: Kaitlin Geagan