BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JUNE 13, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME PLEASANT WEATHER TODAY BEHIND COLD FRONT Despite a cold frontal passage last night, it's been another warm day today, with a high temperature for the day so far of 79F. Only a trace of rainfall was recorded with the frontal passage, and our yearly precipitation deficit now exceeds 3.50 inches. The skies have been variably cloudy for most of the day, with mostly cloudy skies early this morning, but we've had sunshine observed through some high cloudiness for the late morning and into the afternoon. Visibility was a spectacular 85 miles at the 7:00 EST observation this morning, a very rare value for this time of year. It has dropped to 70 miles by afternoon. Winds were brisk from the S last evening, and remained a little gusty from the NW early this morning, but they have died down as the day has gone on, allowing a NE sea breeze to develop. Today's Observations: 7 A.M. Weather: Broken stratocumulus, broken cirrus, few altocumulus distant NNE-E Temperature: 70F; Dew Point: 61F; Wind: NNW at 12G20 kts Sea-level pressure: 29.85 ins. Hg, rising Visibility: 85 miles 6-hr Max temp: 71F 6-hr Min temp: 69F 24-hr precip: Trace BHO SA 1155 E20 BKN 250 BKN 85 110/70/61/3412G20/985/ FEW AC DSNT NNE-E/ 8/571 52031 MANUAL 6000/ 10071 20069 10 A.M. Weather: Scattered stratocumulus, scattered cirrus, few dense cirrus mostly S Temperature: 73F; Dew Point: 62F; Wind: NE at 7 kts Sea-level pressure: 29.93 ins. Hg, rising then rising more slowly Visibility: 70 miles BHO SA 1455 30 SCT 250 SCT 70 137/73/62/0507/993/ FEW DNS CI MSTLY S/ 8/501 51027 1 P.M. Weather: Scattered cirrus, broken cirrus (higher level), few small stratocumulus SW-N Temperature: 78F; Dew Point: 57F; Wind: estimated NNE at 2 kts, Wind: Light and variable Sea-level pressure: 29.94 ins. Hg, rising slightly Visibility: 70 miles 6-hr Max temp: 79F 6-hr Min temp: 67F BHO SA 1755 220 SCT E250 BKN 70 138/78/57/E0302/994/ FEW SML SC SW-N WND L/V/ 8/501 53001 10079 20067 SUMMARY FOR FRIDAY, JUNE 12, 2015 TEMPERATURE (DEGREES F) MAX.....86 NORMAL.....74 MIN.....65 NORMAL.....56 MEAN....76 NORMAL.....65 DEPARTURE FROM 30-YEAR NORMAL.......................+11 TOTAL DEPARTURE FOR THE MONTH.......................-37 [-3.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............0 DEPARTURE...........-3 TOTAL HEATING UNITS FOR THE MONTH..............78 DEPARTURE..........+32 TOTAL HEATING UNITS FOR THE SEASON...........6482 DEPARTURE.........+133 TOTAL HEATING UNITS LAST SEASON TO DATE......6419 DIFFERENCE.........+63 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY.............11 DEPARTURE..........+8 TOTAL COOLING UNITS FOR THE MONTH.............28 DEPARTURE..........+1 TOTAL COOLING UNITS FOR THE SEASON............77 DEPARTURE.........+26 TOTAL COOLING UNITS LAST SEASON TO DATE.......39 DIFFERENCE........+38 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................26 S AT 9:17 P.M. ASOS.......................29 S AT 9:33 P.M. DAVIS......................28 S AT 9:17 P.M. RMY 29 FASTEST MILE FOR YESTERDAY....................21 S AT 9:32 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................22 S AT 9:33 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................20 S AT 9:33 P.M. AVERAGE WIND SPEED AND DIRECTION..............9.5 SSW ASOS.......................9.7 DAVIS......................7.9 SW [221 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace DEPARTURE....-0.16 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........1.58 DEPARTURE....-0.39 ASOS...............1.60 TOTAL PRECIPITATION FOR THE YEAR.......... 20.95 DEPARTURE....-3.55 ASOS...............N/A *** *** ASOS annual totals not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP//SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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 6/1 48/46/47/-15/0.69/000/00 32 NE RMY 34 6/2 47/44/46/-16/..../000/00 28 NNE RMY 28 6/3 59/44/52/-10/0.00/172/19 16 ESE RMY 16 6/4 63/46/55/-8/0.00/445/49 17 E RMY 16 6/5 70/49/60/-3/T/500/55 17 NNE RMY 17 6/6 65/52/59/-4/0.06/382/42 26 ENE RMY 27 6/7 73/49/61/-3/0.00/884/97 28 S RMY 29 6/8 73/50/62/-2/T/310/34 41 SSW RMY 48 6/9 76/61/69/+4/0.03/228/25 29 SSW RMY 32 6/10 82/57/70/+5/0.00/.../.. 24 WSW RMY N/A 6/11 85/61/73/+8/0.00/.../.. 29 SSW RMY 32 6/12 86/65/76/+11/..../.../.. 26 S RMY 29 6/13 low since midnight is 67F; normal low is now 56F DAILY RECORDS FOR JUNE 2015 6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F surpasses previous record of 51F in 2004 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 13 HIGH 93F IN 1988 LOW 43F IN 1982 PRECIP 6.07 INS 1998 [Record for month] PEAK GUST 69 MPH N IN 1956 RECORDS FOR JUNE 14 HIGH 93F IN 1956 LOW 41F IN 1912 PRECIP 1.49 INS 1896 PEAK GUST 55 MPH WNW IN 1958 TODAY'S REPORT PREPARED BY: Jonathan O'Brien