BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, OCTOBER 18, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME COLD TEMPERATURES AND HIGH PRESSURE WITH A PERSISTING WESTERLY WIND.... Pressure rose steadily throughout the observation period, with 1 P.M. marking a trend towards lower readings. Meanwhile, high pressure has enforced clear skies with just a few cumulus clouds lingering in the sky throughout the day. Temperatures have remained cold, with the low registering just before sunrise this morning. Temperatures remain below seasonal averages despite the absence of cloud cover. The high so far today is 44 F with the low running at 33 F. These readings are well below the average max of 60 F and the average min of 42 F. Winds remain elevated, with westerlies over 10 mph enduring into the afternoon. Today's Observations: 7 A.M. Weather: Few distant cumulus in all directions Temperature: 35F; Dew Point: 30F; Wind: WNW at 13G21 kts Sea-level pressure: 30.16 ins. Hg, rising steadily Visibility: 75 miles 6-hr Max temp: 39F 6-hr Min temp: 33F 24-hr Precip: 0.01 ins. BHO SA 1155 CLR 75 213/35/30/2913G21/016/ FEW DSNT CU ALQDS/ 8/100 70001 52034 10039 20033 10 A.M. Weather: Few cumulus in all directions Temperature: 40F; Dew Point: 18F; Wind: W at 11G20 kts, Peak wind: 31 mph (27 kts) W at 9:25 A.M. Sea-level pressure: 30.21 ins. Hg, rising steadily Visibility: 75 miles 3-hr Precip: 0.00 ins. BHO SA 1455 CLR 75 230/40/18/2811G20/021/ FEW CU ALQDS PK WND 2827/25/ 8/100 70001 51017 1 P.M. Weather: Few distant cumulus in all directions Temperature: 44F; Dew Point: 21F; Wind: W at 15G20 kts, Sea-level pressure: 30.19 ins. Hg, dropping slowly Visibility: 80 miles 6-hr Max temp: 44F 6-hr Min temp: 35F 6-hr Precip: 0.00 ins. BHO SA 1755 CLR 80 225/44/21/2615G20/019/ FEW DSNT CU ALQDS/ 8/100 58005 10044 20035 SUMMARY FOR WEDNESDAY, OCTOBER 17, 2018 TEMPERATURE (DEGREES F) MAX.....60 NORMAL.....60 MIN.....39 NORMAL.....42 MEAN....50 NORMAL.....51 DEPARTURE FROM 30-YEAR NORMAL.......................-1 TOTAL DEPARTURE FOR THE MONTH......................+48 [+2.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............15 DEPARTURE.........+1 TOTAL HEATING UNITS FOR THE MONTH.............147 DEPARTURE........-45 TOTAL HEATING UNITS FOR THE SEASON............234 DEPARTURE.......-100 TOTAL HEATING UNITS LAST SEASON TO DATE.......181 DIFFERENCE.......+53 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0 DEPARTURE...........0 TOTAL COOLING UNITS FOR THE MONTH..............11 DEPARTURE..........+6 TOTAL COOLING UNITS FOR THE SEASON............874 DEPARTURE........+272 TOTAL COOLING UNITS LAST SEASON TO DATE.......727 DIFFERENCE.......+147 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................48 W AT 4:12 P.M. AERO.........................50 W AT 4:15 P.M. ASOS.........................52 WNW AT 4:15 P.M. DAVIS........................52 NW AT 4:15 P.M. RMY 53 FASTEST MILE FOR YESTERDAY......................39 W AT 4:12 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................36 WNW AT 4:15 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................39 WNW AT 4:15 P.M. AVERAGE WIND SPEED AND DIRECTION...............14.8 W ASOS........................14.3 DAVIS.......................15.1 W [266 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE......-0.14 ASOS..............0.03 TOTAL PRECIPITATION FOR THE MONTH..........2.76 DEPARTURE......+0.24 ASOS..............2.76 TOTAL PRECIPITATION FOR THE YEAR..........49.96 DEPARTURE......+8.54 ASOS.............51.68 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 10/01 65/53/59/+2/..../042/06 21 ENE AERO 18 SSW RMY N/A 10/02 64/53/59/+2/..../000/00 33 S AERO 32 S RMY 35 TSTM 10/03 60/52/56/0/..../000/00 18 NNE AERO 14 NNE RMY 14 10/04 69/57/63/+7/..../209/30 29 SSW AERO 29 SSW RMY 32 10/05 64/47/56/0/..../638/92 25 NE AERO 21 NE RMY 24 10/06 64/45/55/0/0.00/276/40 23 SSW AERO 23 SSW RMY 25 10/07 75/56/66/+11/..../076/11 28 NE AERO 24 ENE RMY 27 10/08 56/53/55/+1/..../000/00 22 ENE AERO 20 ENE RMY N/A 10/09 75/56/66/+12/..../211/31 26 WSW AERO 28 SW RMY 29 10/10 82/65/74/+20/..../496/73 24 WSW AERO 23 WSW RMY 25 10/11 70/56/63/+10/..../.../.. 48 NNE AERO 47 NNE RMY 50 10/12 59/44/52/-1/..../.../.. 32 NW AERO 32 NW RMY 33 10/13 49/40/45/-8/..../.../.. 21 WNW AERO 20 WNW RMY 20 10/14 55/37/46/-6/..../.../.. 21 W AERO 18 W RMY 21 10/15 66/44/55/+3/..../.../.. 46 W AERO 46 W RMY N/A 10/16 56/41/49/-2/..../.../.. 48 W AERO 48 W RMY N/A 10/17 60/39/50/-1/..../.../.. 48 W AERO 50 W RMY 53 10/18 Low temp since midnight is 33F; normal low is 42F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 18 HIGH 82F IN 1908 LOW 26F IN 1939 PRECIP 2.79 INCHES IN 1975 SNOWFALL 3.0 INCHES IN 2009 PEAK GUST 66 MPH S IN 1967 RECORDS FOR OCTOBER 19 HIGH 81F IN 1945 LOW 21F IN 1922 PRECIP 3.64 INCHES IN 1932 SNOWFALL 1.0 INCHES IN 1972 PEAK GUST 66 MPH SSW IN 1967 TODAY'S REPORT PREPARED BY: Nate Iannuccillo & Benjamin Turner