BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, AUGUST 21, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME LIMITED VISIBILITY WITH BUILDING CUMULUS IN THE AFTERNOON.... Visibility was limited throughout the day, with 35 miles on average due to a distant haze. Conditions were increasingly cloudy, with some cumulonimbus clouds being seen during the 1 P.M. observation. A couple rumbles of thunder were heard to the southwest. Wind has been southerly, with speeds up to 26 mph. The high so far today is 85F, 6 degrees above the daily normal maximum of 79F. The low since midnight is 67F, 6 degrees above the average daily minimum of 61F.   Today's Observations: 7 A.M. Weather: Scattered altocumulus, broken cirrus Temperature: 74F; Dew Point: 70F; Wind: S at 9 kts Sea-level pressure: 30.03 ins. Hg, rising then falling Visibility: 30 miles, hazy 6-hr Max temp: 74F 6-hr Min temp: 67F 24-hr Precip: 0.00 ins. BHO SA 1155 110 SCT E250 BKN 30 169/74/70/1909/003/ HAZY/ 8/078 55001 10074 20067 10 A.M. Weather: Broken altocumulus, overcast cirrostratus Temperature: 79F; Dew Point: 71F; Wind: S at 8 kts Sea-level pressure: 29.98 ins. Hg, falling, then more rapidly Visibility: 35 miles, hazy 3-hr Precip: 0.00 ins. BHO SA 1455 E110 BKN 250 OVC 35 154/79/71/1708/998/ HAZY/ 8/078 58015 1 P.M. Weather: Scattered cumulus with cumulonimbus to the SW, Overcast cirrostratus Temperature: 82F; Dew Point: 71F; Wind: S at 1913G19 kts Sea-level pressure: 29.92 ins. Hg, falling steadily Visibility: 35 miles, hazy 6-hr Max temp: 85F 6-hr Min temp: 74F 6-hr Precip: 0.00 ins. BHO SA 1755 40 SCT E230 OVC 35 135/82/71/1913G19/992/ DSNT CB SW HAZY/ 8/208 58019 10085 20074 SUMMARY FOR TUESDAY, AUGUST 20, 2019 TEMPERATURE (DEGREES F) MAX.....87   NORMAL.....79 MIN.....66   NORMAL.....62 MEAN....77   NORMAL.....70 DEPARTURE FROM 30-YEAR NORMAL......................+7 TOTAL DEPARTURE FOR THE MONTH.....................+30 [+1.3 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............12   DEPARTURE.........+7 TOTAL COOLING UNITS FOR THE MONTH.............157   DEPARTURE........+24 TOTAL COOLING UNITS FOR THE SEASON............568   DEPARTURE........+84 TOTAL COOLING UNITS LAST SEASON TO DATE.......663   DEPARTURE........-95 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................18 W   AT  3:10 P.M.                    AERO.........................14 SSW AT 11:06 P.M.                    ASOS.........................17 SW  AT  3:10 P.M.                    DAVIS........................16 W   AT 12:04 A.M. RMY N/A FASTEST MILE FOR YESTERDAY......................12 SSW AT 11:06 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................12 SSW AT 11:10 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................13 W   AT 12:02 A.M. AVERAGE WIND SPEED AND DIRECTION..............6.8 W                    ASOS.......................7.3                    DAVIS......................7.2 W [266 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..........0.86  DEPARTURE......-1.90                          ASOS..............0.85 TOTAL PRECIPITATION FOR THE YEAR..........36.18  DEPARTURE......+2.43                          ASOS.............36.13 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 8/01  84/66/75/+3/0.00/755/87               18 NNW AERO 20 NW  RMY 17 8/02  83/61/72/0/0.00/804/93                18 WSW AERO 18 WSW RMY 18 8/03  84/66/75/+3/0.00/302/35               25 SW  AERO 26 SW  RMY 25 8/04  83/66/75/+3/0.00/732/85               21 NE  AERO 23 SW  RMY 25 8/05  81/58/70/-2/0.00/842/98               20 S   AERO 18 S   RMY 19 8/06  79/63/71/-1/0.00/282/33               15 S   AERO 14 S   RMY 17 8/07  82/66/74/+2/..../367/43               32 SSW AERO 35 SSW RMY 35 8/08  84/67/76/+4/..../588/69               30 SW  AERO 24 WNW RMY 29 8/09  82/63/73/+1/..../815/96               28 NW  AERO 25 NW  RMY 26 8/10  78/59/69/-2/..../669/79               32 NW  AERO 28 NW  RMY 28 8/11  78/55/67/-4/0.00/.../..               28 W   AERO 25 W   RMY 28 8/12  82/60/71/0/0.00/.../..                25 W   AERO 23 W   RMY 26 8/13  77/66/72/+1/0.02/.../..               25 W   AERO 24 WSW RMY 24 8/14  75/62/69/-2/..../.../..               24 ENE AERO 22 ENE RMY 22 8/15  77/59/68/-3/..../.../..               17 ESE AERO 15 SSE RMY 16 8/16  78/61/70/-1/..../../..                20 E   AERO 17 ESE RMY 18 8/17  78/67/73/+2/..../../..                14 SE  AERO 15 SE  RMY 15 8/18  88/70/79/+8/..../.../..               18 SSW AERO 18 SSW RMY 21 8/19  92/69/81/+11/..../.../..              25 WSW AERO 23 WSW RMY 25 8/20  87/66/77/+7/..../.../..               18 W   AERO 14 WSW RMY N/A 8/21 Low temp since midnight is 67F; normal low is 62F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 21 HIGH 92F IN 1937, 1995 LOW 47F IN 1982 PRECIP 2.84 INCHES IN 1888 PEAK GUST 54 MPH WSW IN 2004 RECORDS FOR AUGUST 22 HIGH 90F IN 1939 LOW 42F IN 1894 PRECIP 2.28 INCHES IN 1935 PEAK GUST 44 MPH SSW IN 1987 TODAY'S REPORT PREPARED BY: Benjamin Turner