BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, SEPTEMBER 12, 2016   ALL TIMES ARE IN EASTERN STANDARD TIME HIGH PRESSURE BRINGS CLEAR DAY WITH SUNNY SKIES Skies have been clear all day with just a few distant clouds during each observation.  Visibility was very clear at 80 miles in the morning and dropped to 70 miles at the 1:00PM EST observation.   The high pressure over the area has also brought very dry conditions.  Dew points have remained in the mid-40s all day.  Today's temperatures have been very  seasonal: the overnight low dropped to 53F, and the maximum temp. by 1:00PM EST reached 74F.    7 A.M.  Weather: Few cumulus NE and E-ESE, few cirrostratus E-SSW Temperature: 57F; Dew Point: 47F; Wind: NW at 6 kts, Wind Speed: Light Sea-level pressure: 30.24 ins. Hg, rising, then more quickly Visibility: 80 miles 6-hr Max temp: 58F 6-hr Min temp: 53F 24-hr precip: 0.10 in.  BHO SA 1155 CLR 80 240/57/47/3206/024/ FEW CU NE AND E-ESE FEW CS E-SSW WND LGT/ 8/105 53014 MANUAL 70010 ASOS 60009 10058 20053 10 A.M. Weather: Few cumulus E-SSE and SW-NW, few cirrostratus E-SSW, and few cirrus SE-S Temperature: 68F; Dew Point: 54F; Wind: estimated NW at 3 kts, Wind: Light and variable Sea-level pressure: 30.26 ins. Hg, rising then steady Visibility: 80 miles BHO SA 1455 CLR 80 247/68/54/E3203/026/ FEW CU E-SSE AND SW-NW FEW CS E-SSW FEW CI SE-S WND L/V/ 8/105 51007 1 P.M.  Weather: Few cumulus in all directions, few cirrus ESE-SSW and WNW-NNW Temperature: 74F; Dew Point: 41F; Wind: estimated W at 3 kts, Wind: Light and variable Sea-level pressure: 30.22 ins. Hg, falling, then more quickly Visibility: 70 miles 6-hr Max. temp: 74F  6-hr Min. temp: 57F BHO SA 1755 CLR 70 233/74/41/E2803/022/ FEW CU ALQDS FEW CI ESE-SSW AND WNW-NNW WND L/V/ 8/101 58014 10074 20057 SUMMARY FOR SUNDAY, SEPTEMBER 11, 2016   TEMPERATURE (DEGREES F) MAX.....79   NORMAL.....73 MIN.....59   NORMAL.....56  MEAN....69   NORMAL.....65 DEPARTURE FROM 30-YEAR NORMAL........................+4 TOTAL DEPARTURE FOR THE MONTH.......................+33 [+2.8 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............4   DEPARTURE..........+2 TOTAL COOLING UNITS FOR THE MONTH..............51   DEPARTURE.........+16 TOTAL COOLING UNITS FOR THE SEASON............843   DEPARTURE........+271 TOTAL COOLING UNITS LAST SEASON TO DATE.......756   DIFFERENCE........+87  HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE..........-3 TOTAL HEATING UNITS FOR THE MONTH...............0   DEPARTURE.........-19 TOTAL HEATING UNITS FOR THE SEASON.............10   DEPARTURE.........-34 TOTAL HEATING UNITS LAST SEASON TO DATE.........1   DIFFERENCE.........+9    PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY...................39 WNW AT  9:34 A.M.                     AEROVANE....................30 WNW AT  9:31 A.M.                     ASOS........................42 WNW AT  9:31 A.M.                     DAVIS.......................41 W   AT  9:34 A.M. RMY 43  FASTEST MILE FOR YESTERDAY.....................28 WNW AT  9:33 A.M.       MAXIMUM 2-MINUTE ASOS AVERAGE..................26 NW  AT  9:34 A.M.  MAXIMUM 2-MINUTE DAVIS AVERAGE.................25 WNW AT  9:34 P.M.  AVERAGE WIND SPEED AND DIRECTION.............15.2 S                      ASOS......................14.6                    DAVIS.....................13.3 WSW [240 Deg.] * Last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.10  DEPARTURE......-0.03                          ASOS..............0.09 TOTAL PRECIPITATION FOR THE MONTH..........1.31  DEPARTURE......-0.04                          ASOS..............1.30 TOTAL PRECIPITATION FOR THE YEAR..........26.28  DEPARTURE.....-10.09                          ASOS.............26.57    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 9/1  72/64/68/0/0.09/.../..                  21 NNW AERO 16 NNW RMY 20 9/2  76/58/67/-1/0.00/.../..                 23 ENE AERO 17 NE  RMY 23 9/3  71/56/64/-3/0.00/.../..                 16 E   AERO 12 E   RMY N/A 9/4  71/58/65/-2/0.00/.../..                 28 NE  AERO 21 NE  RMY 27 9/5  73/57/65/-2/0.52/.../..                 42 NNE AER0 33 NNE RMY 43   9/6  70/61/66/-1/0.54/.../..                 32 N   AERO 23 NNE RMY N/A   9/7  78/66/72/+6/0.05/.../..                 21 NE* AERO 15 NE* RMY 21 9/8  79/65/72/+6/T/.../..                    22 S   AERO 15 S   RMY 23 9/9  90/69/80/+14/T/.../..                   23 W   AERO 24 W   RMY 25   9/10 82/71/77/+12/T/.../..                   25 S   AERO 18 S   RMY 32 9/11 79/59/69/+4/0.10/.../..                 39 WNW AERO 30 WNW RMY 43 9/12 Low temp since midnight is 53F; normal low is now 56F DAILY RECORDS FOR SEPTEMBER 2016 9/10/16: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F,          BREAKS PREVIOUS RECORD OF 69F SET IN 1915, 1931, AND 1989 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):  RECORDS FOR SEPTEMBER 12 HIGH 92F IN 1961 LOW 42F IN 1958,1967,1985 PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA) PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA) RECORDS FOR SEPTEMBER 13 HIGH 91F IN 1957 LOW 40F IN 1985 PRECIP 3.10 INCHES IN 1987 PEAK GUST 44 MPH WNW IN 1986 TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle