BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, NOVEMBER 30, 2017   ALL TIMES ARE IN EASTERN STANDARD TIME COOLER TEMPERATURES RETURN AFTER AN ABOVE SEASONABLY WARM DAY YESTERDAY....  A cold front with winds from the northwest passed Blue Hill Observatory causing temperatures to drop 32 degrees overnight. Yesterday we had a unseasonably warm high of 58F. This is 13 degrees above the daily normal of 45F. The overnight minimum was 26F which is 3 degrees below the daily normal of 29F. We are back to temperatures that are slightly below normal with a high of 42F by 1:00 P.M. today. This is also 3 degrees below the normal daily high maximum of 45F.  The wind picked you yesterday afternoon with a peak gust of 46 MPH from the west. Today the wind has  been light and variable, shifting to a southern wind just after 10:00 A.M. Cloud cover increased as pressure began to drop throughout the day. The morning started clear with only a few dense cirrus clouds. By 10:00 A.M.  the cirrus/ cirrostratus clouds were scattered and finally by 1:00 P.M. the sky was overcast cirrostratus.  A distance haze kept visibility to 70 miles all day.  Today's Observations: 7 A.M. Weather: Clear, few dense cirrus ESE-W, patches of  cirrocumulus S-SW Temperature: 27F; Dew Point: 20F; Wind: NW at 9 kts Sea-level pressure: 30.36 ins. Hg, falling then rising Visibility: 70 miles 6-hr Max temp: 33F 6-hr Min temp: 26F 24-hr precip: 0.00 ins. BHO SA 1155 CLR 70 282/27/20/3109/036/ FEW DNS CI ESE-W  PTCHS CC S-SW/ 8/002 53015 10033 20026   10 A.M. Weather: Scattered cirrostratus, few cirrus in all  directions Temperature: 37F; Dew Point: 24F; Wind: S at 3 kts, Wind: Light Sea-level pressure: 30.35 ins. Hg, rising then falling Visibility: 70 miles, thin smoke layer along horizon, distant haze  3-hr precip: 0.00 ins.  BHO SA 1455 250 SCT 70 278/37/24/E1903/035/ FEW CI ALQDS  THN K LYR ALG HRZN WSW-N LGT DSNT HZ WND LGT/ 8/006 58004  1 P.M. Weather: Overcast cirrostratus, parhelion   Temperature: 42F; Dew Point: 28F; Wind: SSE at 9 kts Sea-level pressure: 30.26 ins. Hg, falling unsteadily   Visibility: 70 miles distant haze 6-hr Max temp: 42F 6-hr Min temp: 27F 6-hr precip: 0.00 ins. BHO SA 1755 E250 OVC 70 247/42/28/1609/026/ PARHELION  DSNT HZ/ 8/007 56031 10042 20027  SUMMARY FOR WEDNESDAY, NOVEMBER 29, 2017   TEMPERATURE (DEGREES F) MAX.....58   NORMAL.....45 MIN.....34   NORMAL.....29 MEAN....46   NORMAL.....37 DEPARTURE FROM 30-YEAR NORMAL...........................+9 TOTAL DEPARTURE FOR THE MONTH...........................-2 [-0.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY............19  DEPARTURE..........-9 TOTAL HEATING UNITS FOR THE MONTH...........671  DEPARTURE..........+1 TOTAL HEATING UNITS FOR THE SEASON..........939  DEPARTURE........-294 TOTAL HEATING UNITS LAST SEASON TO DATE....1016  DIFFERENCE........-77 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY...................46 W   AT 2:09 P.M.                     AERO........................47 W   AT 2:10 P.M.                    ASOS........................47 WNW AT 2:10 P.M.                    DAVIS.......................45 W   AT 2:10 P.M. RMY 46 FASTEST MILE FOR YESTERDAY.....................35 W   AT 2:08 P.M.     MAXIMUM 2-MINUTE ASOS AVERAGE..................36 W   AT 2:11 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................37 WNW AT 2:11 P.M. AVERAGE WIND SPEED AND DIRECTION.............17.4 SSW                     ASOS......................17.0                    DAVIS.....................16.6 W   [266 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..........2.04  DEPARTURE......-2.56                          ASOS..............2.00 TOTAL PRECIPITATION FOR THE YEAR..........49.84  DEPARTURE......+1.47                          ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings  PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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 11/1  53/39/46/0/0.00/167/27           25 SE  AERO 24 SE  RMY 25 11/2  71/49/60/+14/0.00/000/00         28 SSE AERO 25 SSE RMY 27 11/3  74/47/61/+15/T/350/57            35 WNW AERO 35 WNW RMY 38  11/4  54/39/47/+2/0.00/545/89          31 NW  AERO 31 NW  RMY N/A  11/5  61/46/54/+9/0.01/006/01          26 S   AERO 24 S   RMY N/A 11/6  64/47/56/+11/0.05/000/00         32 S   AERO 28 SSW RMY 35 11/7  46/35/41/-4/0.11/145/24          26 NNW AERO 23 N   RMY 26 11/8  43/34/39/-5/0.08/295/49          26 N   AERO 23 N   RMY 27  11/9  50/31/41/-3/0.01/480/80          25 S   AERO 23 S   RMY N/A  11/10 45/20/33/-11/0.00/586/98         46 WNW AER0 44 WNW RMY 46  11/11 36/18/27/-16/0.00/589/99         28 WNW AERO 26 WNW RMY 28  11/12 44/27/36/-7/0.00/302/51          13 E   AERO  9 S   RMY 14 11/13 40/35/38/-5/0.26/000/00          20 NNW AERO 17 NNW RMY 20 11/14 40/33/37/-5/T/000/00             18 N   AERO 15 N   RMY 18 11/15 43/31/37/-5/0.00/417/71          20 NE  AERO 15 NE  RMY N/A 11/16 51/37/44/+2/0.21/012/02          32 SE  AERO 32 SE  RMY N/A TSTM 11/17 42/30/36/-5/0.00/565/97          41 WNW AERO 43 WNW RMY 47 11/18 49/26/38/-3/0.08/168/29          35 SSW AERO 35 SSW RMY 39 11/19 58/34/46/+5/0.36/231/40          50 W   AERO 50 W   RMY 54 11/20 39/31/35/-5/0.00/462/80          48 WNW AERO 50 WNW RMY 44  11/21 57/35/46/+6/0.00/506/88          46 SSW AERO 46 SSW RMY 48  11/22 53/35/44/+4/0.87/000/00          37 NW  AERO 38 NW  RMY 41  11/23 40/26/33/-6/0.00/571/100         26 NW  AERO 25 NW  RMY N/A  11/24 49/29/39/0/0.00/.../..           28 SSW AERO 26 SSW RMY 29  11/25 57/38/48/+9/0.00/.../..          29 SSW AERO 28 SSW RMY 31 11/26 46/33/40/+2/0.00/.../..          39 WNW AERO 41 WNW RMY 41  11/27 44/24/34/-4/0.00/.../..          37 W   AERO 39 W   RMY 36  11/28 45/19/32/-6/0.00/.../..          35 S   AERO 37 S   RMY N/A 11/29 58/34/46/+9/0.00/.../..          46 W   AERO 47 W   RMY 46  11/30 Low temp since midnight is 26F; normal low is now 29F DAILY RECORDS FOR NOVEMBER 2017 11/10/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 20F,           TIES WITH PREVIOUS RECORD SET IN 2004 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):       RECORDS FOR NOVEMBER 30 HIGH 67 IN 2006 LOW 7 IN 1887, 1929 PRECIP 2.42 INCHES IN 1944 SNOWFALL 10.2 INS IN 1945 PEAK GUST 90 SSW IN 1963 RECORDS FOR DECEMBER 1 HIGH 70 IN 2001 LOW 3 IN 1887 PRECIP 1.46 INS. IN 1917 SNOW 2.0 INS. IN 1902 PEAK GUST 72 MPH NW IN 1964 TODAY'S REPORT PREPARED BY: Kaitlin Geagan