BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, SEPTEMBER 7, 2015 LABOR DAY ALL TIMES ARE IN EASTERN STANDARD TIME UNSEASONABLE HEAT RETURNS, LABOR DAY MARKS NEARLY TWO WEEKS WITHOUT MEASURABLE PRECIPITATION Yesterday's maximum temperature of 87F, some 12 degrees above the daily normal maximum temperature, continued a longer term trend of above normal temperatures during the transition from meteorological summer to autumn. A significant dry streak has continued through this morning, with no measurable precipitation recorded so far this month, and now two weeks since more than a trace was measured on August 24th. Annual precipitation is now 5.47 inches below normal with very little change in the long term outlook. A small fire was reported in the Blue Hill Reservation yesterday. Heat was building throughout the morning today after an overnight low of 63F. By the 1:00 PM EST observation temperatures had reached 91F, just one degree below today's daily record maximum temperature of 92F set back in 2007. Today's Observations: 7 A.M. Weather: Clear, few cumulus distant SSE-SSW Temperature: 67F; Dew Point: 57F; Wind: SW at 10 kts, Sea-level pressure: 30.09 ins. Hg, falling, then rising and higher Visibility: 35 miles, obscured by dark smoke layer distant in all directions 6-hr Max temp: 67F 6-hr Min temp: 63F 24-hr precip: 0.00 BHO SA 1155 CLR 35 190/67/57/2310/009/ FEW CU DSNT SSE-SSW DRK K LYR ALQDS/ 8/100 53003 10067 20063 10 A.M. Weather: Sky clear Temperature: 82F; Dew Point 62F; Wind: SSW at 8 kts, Sea-level pressure: 30.08 ins. Hg, rising, then falling and lower Visibility: 35 miles. light smoke layer in all directions, hazy BHO SA 1455 CLR 35 185/82/62/2008/008/ SKC LGT K LYR ALQDS HAZY/ 8/000 58005 1 P.M. Weather: Clear, few cumulus and cirrus distant NW Temperature: 91F; Dew Point: 63F; Wind: SW at 10G18 kts Sea-level pressure: 30.03 ins. Hg, falling then more quickly Visibility: 25 miles, light smoke layer in all directions, hazy 6-hr Max: 91F 6-hr Min: 67F BHO SA 1755 CLR 25 168/91/63/2210G18/003/ FEW CU AND CI DSNT NW LGT K LYR ALQDS HAZY/ 8/101 58017 10091 20067 SUMMARY FOR SUNDAY, SEPTEMBER 6, 2015 TEMPERATURE (DEGREES F) MAX.....87 NORMAL.....75 MIN.....57 NORMAL.....58 MEAN....72 NORMAL.....67 DEPARTURE FROM 30-YEAR NORMAL........................+5 TOTAL DEPARTURE FOR THE MONTH.......................+25 [+4.0 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............7 DEPARTURE..........+4 TOTAL COOLING UNITS FOR THE MONTH..............39 DEPARTURE.........+18 TOTAL COOLING UNITS FOR THE SEASON............705 DEPARTURE........+147 TOTAL COOLING UNITS LAST SEASON TO DATE.......555 DIFFERENCE.......+150 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................21 SSW AT 6:25 P.M.* ASOS........................22 S AT 6:24 P.M. DAVIS.......................21 SSW AT 7:06 P.M. RMY 22 FASTEST MILE FOR YESTERDAY.....................17 S AT 6:19 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................17 S AT 6:19 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................17 S AT 6:19 P.M. AVERAGE WIND SPEED AND DIRECTION..............9.7 WSW ASOS.......................9.8 DAVIS......................8.9 WSW [240 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.....-0.13 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........0.00 DEPARTURE.....-0.71 ASOS...............0.00 TOTAL PRECIPITATION FOR THE YEAR...........30.26 DEPARTURE.....-5.47 ASOS................N/A *** *** ASOS annual total not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 9/1 81/65/73/+5/0.00/.../.. 20 SSW RMY 20 9/2 89/64/77/+9/0.00/.../.. 20 SW RMY 21 9/3 85/66/76/+9/T/.../.. 17 E RMY N/A TSTM 9/4 72/58/65/0/0.00/.../.. 31 ENE RMY N/A 9/5 77/55/66/-1/0.00/.../.. 14 SW RMY 18 9/6 87/57/72/+5/0.00/.../.. 21 SSW RMY 22 9/7 low since midnight is 63F; normal low is now 58F DAILY RECORDS FOR SEPTEMBER 2015 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 7 HIGH 92F IN 2007 LOW 40F IN 1888 PRECIP 2.95 INCHES IN 1891 PEAK GUST 58e MPH W IN 1941 RECORDS FOR SEPTEMBER 8 HIGH 93F IN 2007 LOW 42F IN 1978 PRECIP 1.51 INCHES IN 2011 PEAK GUST 45 MPH S IN 2012 TODAY'S REPORT PREPARED BY: Brian Fitzgerald