BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, SEPTEMBER 13, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME MEASURABLE RAINFALL TOTALS 0.04 FOR THE DAY AS LOTS OF MOISTURE BRING LIGHT DRIZZLE AND HEAVY FOG FOR THE DAY BLUE HILL OBSERVATORY ASKS FOR YOUR SUPPORT FOR OUR KICKSTARTER FUNDRAISER FOR A NEW AEROVANE ANEMOMETER- PLEASE SUPPORT BY VISITING: https://www.kickstarter.com/projects/1451380431/fund-the-future-of-climate-science-at-blue-hill-ob Fog and Drizzle have been present all day here at the top of the hill and rain continues to fall with an additional .01 inches since the 7 AM observation. The fog is beginning to lift just before the 1 PM observation but visibility will remain low. Today's Observations: 7 A.M. Weather: Obscurement dense fog and light drizzle Temperature: 60F; Dew Point: 60F; Wind: E at 8 kts, Sea-level pressure: 29.77 ins. Hg, falling, then rising and higher Visibility: 1/8 of a mile, dense fog and drizzle 6-hr Max temp: 61F 6-hr Min temp: 60F 24-hr precip: 0.04 in. BHO SA 1155 W3 X 1/8L-F 081/60/60/0908/977/ 8//// 53010 ASOS 70003 MANUAL 70004 10061 20060 10 A.M. Weather: Obscurement dense fog and light drizzle Temperature: 62F; Dew Point 62F; Wind: E at 5 kts, estimated, Wind: Light Sea-level pressure: 29.79 ins. Hg, rising, then falling slightly Visibility: 1/16 miles, dense fog and drizzle BHO SA 1455 W2 X 1/16L-F 088/62/62/E0905/979/ WND LGT/ 8//// 53007 MANUAL 60001 1 P.M. Weather: Obscurement dense fog and light drizzle Temperature: 65F; Dew Point: 65F; Wind: ESE at 7 kts Sea-level pressure: 29.77 ins. Hg, falling, then steady Visibility: 6 mi, dense fog 6-hr Max: 65F 6-hr Min: 60F 6-hr precip: 0.02 inch BHO SA 1755 W4 X 6L-F 081/65/65/1107/977/ 8//// 56007 MANUAL 60002 10065 20060 SUMMARY FOR SATURDAY, SEPTEMBER 12, 2015 TEMPERATURE (DEGREES F) MAX.....75 NORMAL.....73 MIN.....58 NORMAL.....56 MEAN....67 NORMAL.....64 DEPARTURE FROM 30-YEAR NORMAL.........................+3 TOTAL DEPARTURE FOR THE MONTH.......................+76 [+6.5 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............2 DEPARTURE..........-1 TOTAL COOLING UNITS FOR THE MONTH..............92 DEPARTURE.........+54 TOTAL COOLING UNITS FOR THE SEASON............758 DEPARTURE........+183 TOTAL COOLING UNITS LAST SEASON TO DATE.......565 DIFFERENCE.......+193 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................18 SSE AT 4:34 P.M. ASOS........................20 S AT 4:08 P.M. DAVIS.......................19 SSE AT 4:37 P.M. RMY 25 FASTEST MILE FOR YESTERDAY.................... 15 SE AT 4:33 P.M MAXIMUM 2-MINUTE ASOS AVERAGE..................15 ESE AT 4:09 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................13 SE AT 4:09 P.M. AVERAGE WIND SPEED AND DIRECTION.............. 6.3 ESE ASOS........................6.5 DAVIS.......................5.7 SSE [147 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.04 DEPARTURE.....-0.09 ASOS...............0.03 TOTAL PRECIPITATION FOR THE MONTH...........0.95 DEPARTURE.....-0.53 ASOS...............0.94 TOTAL PRECIPITATION FOR THE YEAR...........31.20 DEPARTURE.....-5.29 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 92/63/78/+12/0.00/.../.. 23 WSW RMY 24 9/8 97/70/84/+18/0.00/.../.. 22 WSW RMY 24 9/9 92/70/81/+15/0.00/.../.. 30 SSW RMY 33 9/10 73/62/68/+3/..../.../.. 29 NE RMY N/A 9/11 70/59/65/0/..../.../.. 33 NE RMY N/A 9/12 75/58/67/2/..../.../.. 18 SSE RMY 25 FOG 9/13 low since midnight is 60F; normal low is now 56F DAILY RECORDS FOR SEPTEMBER 2015 **9/7 DAILY RECORD MAXIMUM TEMPERATURE OF 92F TIES PREVIOUS RECORD SET IN 2007** **9/8 DAILY RECORD MAXIMUM TEMPERATURE OF 97F BREAKS PREVIOUS RECORD OF 93F SET IN 2007** **9/8 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F BREAKS PREVIOUS RECORD OF 69F SET IN 1999** **9/9 DAILY RECORD MAXIMUM TEMPERATURE OF 92F BREAKS PREVIOUS RECORD OF 91F SET IN 2002** **9/9 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F BREAKS PREVIOUS RECORD OF 69F SET IN 1999** DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 13 HIGH 91F IN 1957 LOW 40F IN 1985 PRECIP 3.10 INCHES IN 1987 PEAK GUST 44 MPH WNW IN 1986 RECORDS FOR SEPTEMBER 14 HIGH 90F IN 1931 LOW 34F IN 1911 PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944) PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944) TODAY'S REPORT PREPARED BY: Robert Millette