BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, JUNE 20, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME TEMPERATURES QUICKLY RISE AFTER WIND SHIFT BRINGS WIND FROM THE SOUTH-SOUTHWEST... The morning began comfortably with light wind, low humidity and seasonable temperatures. The overnight low of 58F is 1 degree below the daily normal of 59F. The wind shifted just before 7:00 A.M. from northwest to south-southwest and temperatures quickly began to rise. So far today we reached a max temperature of 81F by 1:00 P.M. This is 5 degrees above the daily normal of 76F. The visibility was best at the 7:00 A.M. observation with 80 miles. Commonly when we have wind from the south a haze is observed, today it only slightly obscured visibility with 70 miles at each other observation. The cloud cover and wind increased throughout the day today due to the falling pressure which began to fall just after 7:00 A.M. Today's Observations: 7 A.M. Weather: Scattered altocumulus Temperature: 68F; Dew Point: 48F; Wind: S at 3 kts, Wind: Light Sea-level pressure: 29.94 ins. Hg, rising, then more rapidly Visibility: 80 miles 6-hr Max temp: 68F 6-hr Min temp: 58F 24-hr Precip: 0.00 ins. BHO SA 1155 160 SCT 80 140/68/48/1703/994/ WND LGT/ 8/030 53015 10068 20058 10 A.M. Weather: Scattered altocumulus, scattered cirrus, few distant cumulus SSE-S Temperature: 76F; Dew Point: 50F; Wind: S at 8G13 kts Sea-level pressure: 29.90 ins. Hg, falling, then more rapidly Visibility: 70 miles, thin distant haze in all directions 3-hr Precip: 0.00 ins BHO SA 1455 160 SCT 250 SCT 70 125/76/50/1908G13/990/ FEW CU DSNT SSE-S THN DSNT HZ ALQDS/ 8/132 58015 1 P.M. Weather: Scattered altocumulus, broken cirrus, few distant cumulus E-SSW Temperature: 79F; Dew Point: 50F; Wind: WSW at 11G16 kts Sea-level pressure: 29.84 ins. Hg, rising, then falling Visibility: 70 miles, thin distant haze in all directions 6-hr Max temp: 81F 6-hr Min temp: 68F 6-hr precip: 0.00 ins. BHO SA 1755 160 SCT 250 BKN 70 104/79/50/2511G16/984/ FEW CU DSNT E-SSW THN DSNT HZ ALQDS/ 8/132 58021 10081 20068 SUMMARY FOR TUESDAY, JUNE 19, 2018 TEMPERATURE (DEGREES F) MAX.....81 NORMAL.....76 MIN.....64 NORMAL.....58 MEAN....73 NORMAL.....67 DEPARTURE FROM 30-YEAR NORMAL.........................+6 TOTAL DEPARTURE FOR THE MONTH.........................-5 [-0.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............0 DEPARTURE...........-2 TOTAL HEATING UNITS FOR THE MONTH.............62 DEPARTURE............0 TOTAL HEATING UNITS FOR THE SEASON..........5909 DEPARTURE.........-456 TOTAL HEATING UNITS LAST SEASON TO DATE.....5724 DIFFERENCE........+185 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............8 DEPARTURE..........+4 TOTAL COOLING UNITS FOR THE MONTH..............48 DEPARTURE..........-3 TOTAL COOLING UNITS FOR THE SEASON............110 DEPARTURE.........+35 TOTAL COOLING UNITS LAST SEASON TO DATE.......130 DEPARTURE.........-20 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................31 WSW AT 12:27 A.M. AERO.........................32 WSW AT 12:27 A.M. ASOS.........................33 SW AT 12:27 A.M. DAVIS........................35 M AT 12:27 A.M.** RMY 32 FASTEST MILE FOR YESTERDAY......................22 NW AT 10:36 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................21 NW AT 10:38 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................22 M AT 12:30 A.M.** AVERAGE WIND SPEED AND DIRECTION..............12.7 NW ASOS.......................12.2 DAVIS......................11.8 **Davis direction malfunctioning PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.13 DEPARTURE......-1.88 ASOS..............1.15 TOTAL PRECIPITATION FOR THE YEAR..........28.45 DEPARTURE......+2.96 ASOS.............30.02 PRELIMINARY CLIMATE SUMMARY FOR JUNE 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 6/01 78/62/70/+8/T/009/01 21 S AERO 21 S RMY N/A 6/02 79/54/67/+5/T/353/39 26 ENE AERO 25 ENE RMY 27 6/03 59/45/52/-10/0.00/816/90 28 ENE AERO 25 ENE RMY N/A 6/04 52/45/49/-14/0.82/000/00 29 ENE AERO 26 ENE RMY 29 6/05 64/47/56/-7/0.19/173/19 24 N AERO 21 N RMY 23 TSTM 6/06 66/50/58/-5/0.00/373/41 23 S AERO 21 S RMY 22 6/07 69/50/60/-4/0.00/282/31 25 S AERO 25 S RMY 27 6/08 79/52/66/+2/0.00/.../.. 20 SW AERO 17 SW RMY 18 6/09 79/58/69/+5/0.00/.../.. 22 W AERO 21 W RMY 22 6/10 72/56/64/-1/0.00/.../.. 20 S AERO 18 S RMY 17 6/11 68/51/60/-5/0.00/.../.. 21 ENE AERO 20 SSW RMY N/A 6/12 77/49/63/-2/0.00/.../.. 37 SW AERO 37 SW RMY 39 6/13 74/56/65/0/T/.../.. 35 SW AERO 36 SW RMY 36 6/14 77/61/69/+3/0.00/.../.. 35 W AERO 36 WNW RMY 37 6/15 68/53/61/-5/0.01/.../.. 17 NNW AERO 16 WNW RMY 19 6/16 83/54/69/+3/0.00/.../.. 25 NNW AERO 24 NNW RMY 25 6/17 86/63/75/+8/0.00/.../.. 23 S AERO 22 S RMY N/A 6/18 86/64/75/+8/0.10/.../.. 37 SSW AERO 37 SSW RMY 40 TSTM 6/19 81/64/73/+6/0.01/.../.. 31 WSW AERO 32 WSW RMY 32 6/20 Low temp since midnight is 58F; normal low is now 59F DAILY RECORDS FOR JUNE 2018 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 20 HIGH 94F IN 1953 LOW 41F IN 1918 PRECIP 2.62 INS 1945 PEAK GUST 63 MPH NE IN 1967, SSW IN 2010 RECORDS FOR JUNE 21 HIGH 94F IN 2012 LOW 42F IN 1940 PRECIP 1.40 INS 1903 PEAK GUST 51 MPH SSW IN 2000 TODAY'S REPORT PREPARED BY: Kaitlin Geagan