BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, SEPTEMBER 17, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME PLEASANTLY FALL-LIKE TODAY WITH A MIX OF SUN AND CLOUDS... Plenty of sunshine this morning has turned into an interplay of sun and clouds this afternoon. Winds have been veering through the day starting out of the northwest early this morning to now being east. This easterly flow is responsible for holding temperatures in the mid 60s thus far. The air has been nice and dry with dew points generally in the low to mid 40s this morning, however with the onshore flow this afternoon, dew points have risen into the low 50s, which is still comfortable. Visibility has been as high as 80 miles during the morning, but has slipped a bit this afternoon to around 65 miles. Our high so far today is 67F, 4 degrees below the normal high of 71F. Our low since midnight is 49F, 5 degrees below the normal of low of 54F. PRELIMINARY STATS FOR AUGUST 2019 TEMPERATURE, Deg. F Avg. Max. 80.4 [+1.2] Avg. Min. 62.1 [+0.3] Mean      71.3 [+0.8] 24-hour corrected mean: 70.5 Max. for month: 92F on the 19th Min. for month: 51F on the 26th COOLING DEGREE DAYS Total cooling units:   211 [+25] Total for the season:  622 [+85] Total for last season: 753 PRECIPITATION, Inches Total: 1.83 [-2.20] Greatest in 24 hrs: 0.81 ins. on the 28th-29th WIND, mph Avg. uncorrected wind speed: 9.1 mph Avg. corrected wind speed:   9.8 mph Prevailing wind direction: N/A Peak gust and direction: N/A   SUNSHINE: Campbell-Stokes card minutes: 16404 minutes of possible 24780 or 66% Astronomical total minutes: 17074 minutes of possible 25768 or 66% Today's Observations: 7 A.M. Weather: Clear, few Cumulus distant ENE-ESE, few Altocumulus distant N-NE Temperature: 54F; Dew Point: 45F; Wind: NW at 11 kts Sea-level pressure: 30.11 ins. Hg, rising steadily Visibility: 70 miles 6-hr Max temp: 54F 6-hr Min temp: 49F 24-hr Precip: 0.00 ins. BHO SA 1155 CLR 70 196/54/45/3211/011/ FEW CU DSNT ENE-ESE FEW AC DSNT N-NE/ 8/280/ 52014 10054 20049 10 A.M. Weather: Scattered Cumulus, few distant Altocumulus ESE-SE Temperature: 63F; Dew Point: 43F; Wind: N at 8 kts, gusting to 16 kts   Sea-level pressure: 30.13 ins. Hg, steady, then rising Visibility: 80 miles 3-hr Precip: 0.00 ins. BHO SA 1455 50 SCT 80 202/63/43/3608G16/013/ FEW AC DSNT ESE-SE 8/280/ 53006 1 P.M. Weather: Broken Cumulus, broken Altocumulus Temperature: 65F; Dew Point: 51F; Wind: E at 10 kts, gusting to 18 kts Sea-level pressure: 30.13 ins. Hg, steady, then rising Visibility: 65 miles 6-hr Max temp: 67F 6-hr Min temp: 54F 6-hr Precip: 0.00 ins. BHO SA 1755 E50 BKN 80 BKN 65 204/65/51/0810G18/013/ 8/250/ 53002 10067 20054   SUMMARY FOR MONDAY, SEPTEMBER 16, 2019 TEMPERATURE (DEGREES F) MAX.....72   NORMAL.....72 MIN.....54   NORMAL.....55 MEAN....63   NORMAL.....63 DEPARTURE FROM 30-YEAR NORMAL...................... 0 TOTAL DEPARTURE FOR THE MONTH.....................-23 [-1.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON AUG TO JUL) TOTAL HEATING UNITS FOR YESTERDAY...............2   DEPARTURE.........-2 TOTAL HEATING UNITS FOR THE MONTH..............36   DEPARTURE.........+1 TOTAL HEATING UNITS FOR THE SEASON.............48   DEPARTURE........-12 TOTAL HEATING UNITS LAST SEASON TO DATE........28   DEPARTURE........+20 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE.........-2 TOTAL COOLING UNITS FOR THE MONTH..............25   DEPARTURE........-20 TOTAL COOLING UNITS FOR THE SEASON............644   DEPARTURE........+62 TOTAL COOLING UNITS LAST SEASON TO DATE.......829   DEPARTURE.......-185 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................25 WNW AT 10:26 A.M.                    AERO.........................23 WNW AT  9:45 A.M.                    ASOS.........................25 WNW AT 10:26 A.M.                    DAVIS........................24 WNW AT  9:43 A.M. RMY 25 FASTEST MILE FOR YESTERDAY......................17 WNW AT  9:43 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................17 NW  AT 10:27 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................18 WNW AT  9:45 A.M. AVERAGE WIND SPEED AND DIRECTION............... 9.4 NW                    ASOS........................ 9.5                    DAVIS....................... 9.8 NW [324 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.98  DEPARTURE......-1.04                          ASOS..............0.96 TOTAL PRECIPITATION FOR THE YEAR..........38.13  DEPARTURE......+1.08                          ASOS.............37.99 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 9/01  73/56/65/-3/0.00/.../..                21 ENE AERO 14 ENE RMY 18 9/02  75/57/66/-2/0.37/.../..                39 W   AERO 41 W   RMY 41 9/03  77/61/69/+2/0.00/.../..                18 S   AERO 16 S   RMY N/A 9/04  83/61/72/+5/0.00/.../..                30 SW  AERO 28 SW  RMY 30 9/05  68/54/61/-6/0.00/.../..                23 NW  AERO 17 NW  RMY N/A 9/06  65/56/61/-6/..../.../..                37 ENE AERO 36 ENE RMY 36 9/07  70/51/61/-5/0.00/.../..                37 N   AERO 37 N   RMY N/A 9/08  73/53/63/-3/0.00/.../..                25 W   AERO 21 W   RMY N/A 9/09  71/54/63/-3/0.00/.../..                17 SE  AERO 16 SE  RMY 16 9/10  73/57/65/0/0.00/.../..                 25 S   AERO 25 S   RMY N/A 9/11  83/63/73/+8/0.00/.../..                31 SW  AERO 32 SW  RMY N/A 9/12  70/52/61/-4/0.11/.../..                29 ENE AERO 28 ENE RMY 28 9/13  65/49/57/-7/0.00/.../..                29 ENE AERO 27 ENE RMY 27 9/14  69/49/59/-5/..../.../..                36 S   AERO 37 S   RMY 37 9/15  78/62/70/+6/0.00/.../..                24 W   AERO 23 W   RMY 22 9/16  72/54/63/0/0.00/.../..                 25 WNW AERO 23 WNW RMY 25 9/17  High so far 67F, Low so far 49F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 17 HIGH 87F IN 2015 LOW 38F IN 1959 PRECIP 2.73 INCHES IN 1933 PEAK GUST 60 MPH WNW IN 1999 RECORDS FOR SEPTEMBER 18 HIGH 88F IN 1906 LOW 36F IN 1919 PRECIP 4.25 INCHES IN 1996 PEAK GUST 77e MPH WNW IN 1948 TODAY'S REPORT PREPARED BY: Matt Douglas