BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, SEPTEMBER 17, 2015  ALL TIMES ARE IN EASTERN STANDARD TIME RECORD HEAT BUILDS TODAY AS WARM, DRY STRETCH CONTINUES - DAILY RECORD TIED AT 1:00 PM EST OBSERVATION   **BLUE HILL OBSERVATORY NEEDS YOUR SUPPORT FOR A NEW AEROVANE ANEMOMETER- STILL MORE THAN $5,000 AWAY PLEASE SUPPORT OUR KICKSTARTER FUNDRAISER BY VISITING:** www.kickstarter.com/projects/1451380431/fund-the-future-of-climate-science-at-blue-hill-ob Yesterday's maximum temperature of 84F ended up being seven degrees lower than the daily record for the 16th; however, as heat built today, the daily record of 86F, set in 1915, 1941 and 1991, was tied by the 1:00 PM EST observation.  Dry conditions have prevailed once more today, with a monthly precipitation deficit nearing 3/4 of an inch after yesterday. Additionally, the annual deficit crept close to 5.50 inches drier than normal.  Today's Observations: 7 A.M. Weather: Clear, few cirrus distant N-WSW Temperature: 66F; Dew Point: 58F; Wind: WSW at 10 kts, Sea-level pressure: 30.17 ins. Hg, rising, then falling and lower Visibility: 60 miles, light distant haze, light smoke layer in all directions 6-hr Max temp: 66F   6-hr Min temp: 64F 24-hr precip: 0.00 in. BHO SA 1155 CLR 60 217/66/58/2510/017/ FEW CI DSNT N-WSW LGT K LYR ALQDS LGT DSNT HZ ALQDS/ 8/001 58001 10066 20064 10 A.M. Weather: Clear, few cirrus distant SE-SW Temperature: 79F; Dew Point 60F; Wind: estimated W at 5 kts, Wind Speed: Light Sea-level pressure: 30.17 ins. Hg, steady, then falling slightly Visibility: 50 miles, light distant haze BHO SA 1455 CLR 50 216/79/60/E2705/017/ FEW CI DSNT SE-SW LGT DSNT HZ ALQDS WND LGT/ 8/001 58001  1 P.M. Weather: Clear, few cirrus distant ESE-SW Temperature: 86F; Dew Point: 57F; Wind: SSW at 7 kts Sea-level pressure: 30.11 ins. Hg, falling, then more quickly Visibility: 60 miles, light distant haze 6-hr Max: 86F  6-hr Min: 66F BHO SA 1755 CLR 60 195/86/57/2107/011/ FEW CI DSNT ESE-SW LGT DSNT HZ ALQDS/ 8/001 58021 10086 20066 SUMMARY FOR WEDNESDAY, SEPTEMBER 16, 2015     TEMPERATURE (DEGREES F) MAX.....84   NORMAL.....72  MIN.....62   NORMAL.....55  MEAN....73   NORMAL.....63    DEPARTURE FROM 30-YEAR NORMAL.......................+10 TOTAL DEPARTURE FOR THE MONTH.......................+88  [+5.3 DEGREES/DAY]   COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............8   DEPARTURE..........+6 TOTAL COOLING UNITS FOR THE MONTH.............104   DEPARTURE.........+59 TOTAL COOLING UNITS FOR THE SEASON............770   DEPARTURE........+188 TOTAL COOLING UNITS LAST SEASON TO DATE.......565   DIFFERENCE.......+205   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................17  NW  AT  1:38 A.M.*                      ASOS........................18  NW  AT  1:28 A.M.                       DAVIS.......................17  NW  AT  1:38 A.M. RMY N/A FASTEST MILE FOR YESTERDAY.................... 14  NW  AT  1:14 A.M.   MAXIMUM 2-MINUTE ASOS AVERAGE..................14  NW  AT  1:28 A.M.    MAXIMUM 2-MINUTE DAVIS AVERAGE.................13  WNW AT 12:10 A.M.    AVERAGE WIND SPEED AND DIRECTION...............7.6 SSW                    ASOS........................8.0                      DAVIS.......................6.8 WNW [290 DEG]  PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00  DEPARTURE.....-0.14                          ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........1.35  DEPARTURE.....-0.67                          ASOS...............1.33 TOTAL PRECIPITATION FOR THE YEAR...........31.60  DEPARTURE.....-5.43                          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/+5/0.00/766/97               20 SSW RMY 20 9/2  89/64/77/+9/0.00/732/93               20 SW  RMY 21   9/3  85/66/76/+9/T/612/78                  17 E   RMY N/A TSTM  9/4  72/58/65/0/0.00/297/38                31 ENE RMY N/A 9/5  77/55/66/-1/0.00/748/96               14 SW  RMY 18 9/6  87/57/72/+5/0.00/753/97               21 SSW RMY 22 9/7  92/63/78/+12/0.00/727/94              23 WSW RMY 24 9/8  97/70/84/+18/0.00/693/90              22 WSW RMY 24 9/9  92/70/81/+15/0.00/683/89              30 SSW RMY 33 9/10 73/62/68/+3/..../000/00               29 NE  RMY N/A 9/11 70/59/65/0/..../084/11                33 NE  RMY N/A 9/12 75/58/67/2/..../.../..                18 SSE RMY 25  9/13 66/60/63/-1/..../000/00               25 E   RMY N/A 9/14 70/53/62/-2/0.00/.../..               33 W   RMY 35 9/15 82/56/69/+5/0.00/.../..               23 W   RMY N/A 9/16 84/62/73/+10/0.00/.../..              17 NW  RMY N/A 9/17 low since midnight is 64F; normal low is now 54F   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 17 HIGH 86F IN 1915,1941,1991 LOW 38F IN 1959 PRECIP 2.73 INCHES IN 1933 PEAK GUST 60 MPH WNW IN 1999 RECORDS FOR SEPTEMBER 18 HIGH 88F IN 1906 LOW 36F IN 1919 PRECIP 4.25 INCHES IN 1996 PEAK GUST 77e MPH WNW IN 1948 TODAY'S REPORT PREPARED BY: Brian Fitzgerald