BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, AUGUST 26, 2017 ALL TIMES ARE IN EASTERN STANDARD TIME BEAUTIFUL LATE SUMMER DAY... Much drier air has moved into New England today, and the low temperature dropped to 55F this morning, the lowest of the month so far. With dew points dropping to the low 40s, the temperature fell to a low of 43F at nearby Norwood Airport this morning. The sky was completely free of clouds early today, though a haze layer aloft has filtered the sun somewhat all day. A few cumulus clouds that began to form by late morning are still just scattered at mid-afternoon. The visibility has been very good today near 70 miles, and the wind has remained generally light. Today's Observations: 7 A.M. Weather: Clear, SKC (sky completely free of clouds), haze aloft all quadrants Temperature: 59F; Dew Point: 48F; Wind: NW at 8 kts Sea-level pressure: 30.26 ins. Hg, rising, then more slowly Visibility: 75 miles 6-hr Max temp: 59F 6-hr Min temp: 55F 24-hr Precip: Trace BHO SA 1155 CLR 75 247/59/47/3208/026/ SKC HZ ALF ALQDS/ 51012 10059 20055 10 A.M. Weather: Clear, few cumulus all quadrants, haze aloft all quadrants Temperature: 69F; Dew Point: 46F; Wind: NW at 8 kts, Sea-level pressure: 30.27 ins. Hg, rising then steady Visibility: 70 miles BHO SA 1455 CLR 70 251/69/46/3108/027/ FEW CU/CUFRA ALQDS HZ ALF ALQDS/ 8/100 51004 1 P.M. Weather: Scattered cumulus and cumulus fractus Temperature: 73F; Dew Point: 42F; Wind: NW at 5 kts Wind: Light and variable Sea-level pressure: 30.25 ins. Hg, falling Visibility: 70 miles 6-hr Max temp: 73F 6-hr Min temp: 59F BHO SA 1755 55 SCT 70 245/73/42/3205/025/ HZ ALF ALQDS WND LGT AND VRB/ 8/100 56006 10073 20059 SUMMARY FOR FRIDAY, AUGUST 25, 2017 TEMPERATURE (DEGREES F) MAX.....75 NORMAL.....78 MIN.....57 NORMAL.....61 MEAN....66 NORMAL.....69 DEPARTURE FROM 30-YEAR NORMAL.........................-3 TOTAL DEPARTURE FOR THE MONTH........................+33 [+1.1 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............1 DEPARTURE..........-4 TOTAL COOLING UNITS FOR THE MONTH.............184 DEPARTURE.........+25 TOTAL COOLING UNITS FOR THE SEASON............605 DEPARTURE.........+95 TOTAL COOLING UNITS LAST SEASON TO DATE.......730 DEPARTURE........-125 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................21 NW AT 12:23 P.M. AERO........................21 NW AT 12:23 P.M. ASOS........................23 NW AT 12:23 P.M. DAVIS.......................20 NW AT 12:22 P.M. RMY 23 FASTEST MILE FOR YESTERDAY.....................14 NW AT 12:23 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................16 NW AT 12:24 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................15 WNW AT 12:23 P.M. AVERAGE WIND SPEED AND DIRECTION..............9.8 NW ASOS.......................9.0 DAVIS......................7.7 NNW [329 DEG.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace DEPARTURE......-0.11 ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........1.44 DEPARTURE......-1.92 ASOS..............1.43 TOTAL PRECIPITATION FOR THE YEAR..........36.20 DEPARTURE......+1.85 ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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 8/1 87/65/76/+4/0.00/762/88 16 ESE*AERO 16 NNW RMY 16 8/2 86/65/76/+4/1.09/372/43 32 W AERO 36 W RMY 34 TSTM 8/3 83/65/74/+2/0.00/552/64 22 S AERO 23 S RMY 24 8/4 84/66/75/+3/0.00/697/81 26 S AERO 30 S RMY 29 8/5 75/63/69/-3/0.10/060/07 23 NW AERO 28 NW RMY 29 8/6 76/57/67/-5/0.00/795/93 30 NW AERO 32 NW RMY 31 8/7 76/60/68/-4/0.01/597/70 28 SSW AERO 28 SSW RMY 29 8/8 74/60/67/-5/0.02/000/00 17 S AERO 16 SSE RMY 16 8/9 83/58/71/-1/0.00/831/98 18 S AERO 18 S RMY 19 8/10 86/63/75/+4/T/643/76 20 S AERO 18 S RMY 20 8/11 82/63/73/+2/0.00/666/79 17 S AERO 16 S RMY 17 8/12 75/57/66/-5/0.17/294/35 22 SSW*AERO 22 SSW RMY 23 8/13 84/67/76/+5/0.00/796/95 26 WNW AERO 24 WNW RMY 26 8/14 82/67/75/+4/0.00/359/43 14 SSW*AERO 14 S RMY 15 8/15 79/64/72/+1/T/058/07 21 S AERO 21 S RMY 23 8/16 83/64/74/+3/0.00/698/84 23 NW* AERO 23 NW RMY 25 8/17 81/58/70/-1/0.00/.../.. 15 SSW AERO 14 SSW RMY N/A 8/18 79/63/71/0/0.01/.../.. 33 S AERO 35 S RMY 35 8/19 89/65/77/+7/0.00/.../.. 23 WSW AERO 23 WSW RMY 25 8/20 84/66/75/+5/0.00/.../.. 23 NW AERO 25 NW RMY 27 8/21 85/63/74/+5/0.00/.../.. 18 SW AERO 20 SW RMY 20 8/22 88/68/78/+8/0.00/.../.. 31 S AERO 35 S RMY 34 8/23 83/64/74/+4/0.04/.../.. 24 WNW*AERO 25 WNW RMY 27 8/24 80/59/70/0/0.00/.../.. 18 WNW*AERO 17 WNW RMY 21 8/25 75/57/66/-3/T/.../.. 21 NW AERO 21 NW RMY 23 8/26 Low temp since midnight is 57F; normal low is now 61F DAILY RECORDS FOR AUGUST None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 26 HIGH 96F IN 1900, 1948 LOW 46F IN 1885 PRECIP 5.85 INCHES IN 1924 PEAK GUST 55e MPH NNW IN 1947 RECORDS FOR AUGUST 27 HIGH 99F IN 1948 LOW 44F IN 1885 PRECIP 2.77 INCHES IN 1946 PEAK GUST 48 MPH NW IN 1983 TODAY'S REPORT PREPARED BY: Mike Iacono