BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, SEPTEMBER 12, 2018  ALL TIMES ARE IN EASTERN STANDARD TIME OVERCAST DAY WITH INTERMITTENT SHOWERS AND BELOW NORMAL HIGH TEMPERATURE... The high temperatures of 67F so far today is 6 degrees  below normal. There was not much divergence in temperature varying between 66-63F during today's observations. The humidity remained between 99-100% all day making for thick air and dense foggy conditions on top of Great Blue Hill.  The wind was light and variable for most of the day yesterday  but has been moderate and from the NE today. Skies remained  overcast all day with a constant drizzle and multiple heavier  rain showers. So far we have measured 0.05 ins overnight and  an additional 0.13 ins. by 1:00 P.M. A few of thunderstorms  have moved over the hill in the past 24 hrs. The first was  south of the observatory yesterday afternoon around 3:00 P.M.  EST. Another two storms passed by this afternoon ending before 2:00 P.M.  The month of September so far is still running above normal for both temperatures and precipitation.   Today's Observations: 7 A.M. Weather: Very light drizzle and fog, overcast nimbostratus   Temperature: 66F; Dew Point: 66F; Wind: ENE at 10G15 kts Sea-level pressure: 30.27 ins. Hg, rising, then more slowly       Visibility: 1/8 mile, fog  6-hr Max temp: 69F 6-hr Min temp: 66F 24-hr Precip: 0.05 ins.   BHO SA 1155 W3 X 1/8L-F 249/66/66/0610G15/027/ PCPN VRY LGT/  8//// 51011 MANUAL 70005 ASOS 70005 10069 20066 10 A.M. Weather: Light rain and fog, overcast nimbostratus   Temperature: 65F; Dew Point: 65F; Wind: ENE at 10G17 kts Sea-level pressure: 30.16 ins. Hg, rising, then more rapidly Visibility: 3/4 mile, fog  3-hr Precip: 0.05 ins.   BHO SA 1455 E4 OVC 3/4R-F 261/65/65/0710G17/030/ 8/02/  53021 MANUAL 70005 ASOS 70006   1 P.M. Weather: Light rain and fog, overcast nimbostratus  Temperature: 63F; Dew Point: 63F; Wind: NE at 8G14 kts Sea-level pressure: 30.30 ins. Hg, falling then steady      Visibility: 1/2 mile, fog  6-hr Max temp: 67F 6-hr Min temp: 63F 6-hr Precip: 0.13 ins.  BHO SA 1755 E6 OVC 1/2R-F 261/63/63/0408G14/030/  TSE45/ 8/02/ 51000 MANUAL 6013/ ASOS 60013 10067 20063    SUMMARY FOR TUESDAY, SEPTEMBER 11, 2018  TEMPERATURE (DEGREES F) MAX.....75   NORMAL.....73 MIN.....61   NORMAL.....56 MEAN....68   NORMAL.....65 DEPARTURE FROM 30-YEAR NORMAL.......................+3 TOTAL DEPARTURE FOR THE MONTH......................+37 [+3.2 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0  DEPARTURE..........-2 TOTAL COOLING UNITS FOR THE MONTH..............69  DEPARTURE.........+34 TOTAL COOLING UNITS FOR THE SEASON............822  DEPARTURE........+250 TOTAL COOLING UNITS LAST SEASON TO DATE.......621  DEPARTURE........+201 HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............3   DEPARTURE...........0 TOTAL HEATING UNITS FOR THE MONTH..............21   DEPARTURE...........2 TOTAL HEATING UNITS FOR THE SEASON.............21   DEPARTURE.........-23 TOTAL HEATING UNITS LAST SEASON TO DATE........44   DEPARTURE.........+57 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY.....................23 E   AT 12:04 A.M.                    AERO..........................21 E   AT 12:04 A.M.                    ASOS..........................22 E   AT 12:04 A.M.                    DAVIS.........................22 ENE AT 12:04 A.M. RMY N/A FASTEST MILE FOR YESTERDAY.......................16 E   AT 12:05 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE....................17 E   AT 12:08 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...................17 E   AT 12:05 A.M. AVERAGE WIND SPEED AND DIRECTION................4.5 E                    ASOS.........................4.6                     DAVIS........................4.9 S [DEG 190]    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05  DEPARTURE......-0.08                          ASOS..............0.05 TOTAL PRECIPITATION FOR THE MONTH..........1.99  DEPARTURE......+0.64                          ASOS..............1.98  TOTAL PRECIPITATION FOR THE YEAR..........39.94  DEPARTURE......+3.75                          ASOS.............41.50 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 75/58/67/-1/0.00/.../..        17 NE  AERO 15 NE  RMY 16        9/02 83/61/72/+4/0.00/.../..        20 SSW AERO 18 SSW RMY N/A  9/03 92/68/80/+13/0.00/.../..       24 WSW AERO 22 WSW RMY 25 9/04 88/70/79/+12/0.00/.../..       17 W   AERO 16 W   RMY 17  9/05 89/67/78/+11/0.00/.../..       23 SSW AERO 23 SSW RMY 25  9/06 92/70/81/+14/0.56/.../..       29 NNW AERO 29 NNW RMY N/A 9/07 70/63/67/+1/0.01/.../..        24 NE  AERO 22 NE  RMY N/A  9/08 68/54/61/-5/0.00/.../..        22 NE  AERO 18 NE  RMY 21 9/09 61/53/57/-9/0.00/.../..        23 NE  AERO 21 NE  RMY N/A 9/10 62/56/59/-6/..../.../..        30 E   AERO 28 E   RMY 28 9/11 75/61/68/+3/..../.../..        23 E   AERO 21 E   RMY N/A TSTM  9/12 Low temp since midnight is 63F; normal low is now 56F DAILY RECORDS FOR SEPTEMBER 09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,           BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959 09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,           TIES PREVIOUS RECORD OF 92F SET IN 1900  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: Kaitlin Geagan