BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER 15, 2016 ALL TIMES ARE IN EASTERN STANDARD TIME COOL BUT DRY CONDITIONS CONTINUE WITH ONGOING HIGH PRESSURE Below average temperatures continued today, reaching a high of 58F by the 1:00PM observation and slowly decreasing from there. Despite thin, high cirrus, it was still a very sunny and pleasant day. A high pressure system continued to bring dry conditions with dew points in the low 40s. Winds remained light out of the NNE-ENE. 7 A.M. Weather: Few cumulus NE-SE, few cirrus NW-ESE, patches of steam fog dissipating over pond SE, inversion present Temperature: 43F; Dew Point: 36F; Wind: NNE at 8 kts Sea-level pressure: 30.45 ins. Hg, rising, then more quickly Visibility: 50 miles 6-hr Max temp: 43F 6-hr Min temp: 38F 24-hr precip: 0.00 in. BHO SA 1155 CLR 50 310/43/36/0208/045/ FEW CU NE-SE FEW CI NW-ESE PTCHS STEAM FG DSSPTG OVR POND VC SE INVSN PRSNT/ 8/101 53013 10043 20038 10 A.M. Weather: Few cumulus in all directions, scattered thin cirrus, few cirrostratus W-E Temperature: 55F; Dew Point: 38F; Wind: NNE at 6 kts, Wind Speed: Light Sea-level pressure: 30.46 ins. Hg, rising, then falling Visibility: 70 miles BHO SA 1455 250 -SCT 70 316/55/38/0306/046/ FEW CU ALQDS FEW CS W-E WND LGT/ 8/105 50006 1 P.M. Weather: Few cumulus in all directions, scattered cirrus, broken thin cirrus Temperature: 55F; Dew Point: 42F; Wind: ENE at 7 kts Sea-level pressure: 30.41 ins. Hg, falling, then more quickly Visibility: 70 miles 6-hr Max. temp: 58F 6-hr Min. temp: 43F BHO SA 1755 250 SCT E300 -BKN 70 298/55/42/0607/041/ FEW CU ALQDS/ 8/102 58018 10058 20043 SUMMARY FOR FRIDAY, OCTOBER 14, 2016 TEMPERATURE (DEGREES F) MAX.....58 NORMAL.....62 MIN.....41 NORMAL.....43 MEAN....50 NORMAL.....52 DEPARTURE FROM 30-YEAR NORMAL........................-2 TOTAL DEPARTURE FOR THE MONTH.......................+22 [+1.4 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0 DEPARTURE...........0 TOTAL COOLING UNITS FOR THE MONTH...............0 DEPARTURE..........-4 TOTAL COOLING UNITS FOR THE SEASON............894 DEPARTURE........+293 TOTAL COOLING UNITS LAST SEASON TO DATE.......810 DIFFERENCE........+84 HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............15 DEPARTURE..........+2 TOTAL HEATING UNITS FOR THE MONTH.............123 DEPARTURE.........-28 TOTAL HEATING UNITS FOR THE SEASON............198 DEPARTURE.........-95 TOTAL HEATING UNITS LAST SEASON TO DATE.......178 DIFFERENCE........+20 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................26 NNW AT 3:16 A.M. ASOS........................28 NW AT 3:16 A.M. DAVIS.......................26 NW AT 2:01 A.M. RMY 25 FASTEST MILE FOR YESTERDAY.....................18 NW AT 2:01 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................18 NW AT 2:15 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................18 NW AT 2:03 A.M. AVERAGE WIND SPEED AND DIRECTION..............9.3 NW ASOS.......................9.6 DAVIS......................8.4 NNW [330 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..........3.30 DEPARTURE......+1.23 ASOS..............3.31 TOTAL PRECIPITATION FOR THE YEAR..........30.62 DEPARTURE.....-10.53 ASOS.............30.95 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 57/52/55/-2/1.22/000/00 33 NNE AERO M RMY 34 10/2 55/52/54/-3/0.19/.../.. 23 N AERO M RMY N/A 10/3 69/53/61/+5/0.00/.../.. 21 ENE AERO M RMY 20 10/4 61/47/54/-2/T/.../.. 26 NE AERO M RMY 27 10/5 61/44/53/-3/0.00/.../.. 22 NE AERO M RMY 21 10/6 71/46/59/+4/0.00/.../.. 16 SW* AERO M RMY 15 10/7 75/54/65/+10/0.00/.../.. 16 S AERO M RMY 16 10/8 69/53/61/+7/0.00/.../.. 23 SSW AERO M RMY 23 10/9 63/44/54/0/1.89/.../.. 28 N AERO M RMY 34 10/10 57/40/49/-5/0.00/.../.. 32 NW AERO M RMY 32 10/11 62/39/51/-2/0.00/.../.. 17 N AERO M RMY N/A 10/12 68/49/59/+6/0.00/.../.. 17 S AERO M RMY 17 10/13 71/52/62/+9/T/.../.. 24 SSW AERO M RMY 28 10/14 58/41/50/-2/0.00/.../.. 26 NNW AERO M RMY 25 10/15 Low temp since midnight is 38F; normal low is now 43F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 15 HIGH 83F IN 1897 LOW 29F IN 1887,1937 PRECIP 4.58 INCHES IN 2005 SNOWFALL TRACE IN 1961,1972 PEAK GUST 69 MPH W IN 2003 RECORDS FOR OCTOBER 16 HIGH 86F IN 1897 LOW 28F IN 1886 PRECIP 2.82 INCHES IN 1974 SNOWFALL TRACE IN 2009 PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL) TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle and Lizzy Suzedell