BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, AUGUST 23, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME A FAIR WEATHER DAY WITH EXCELLENT VISIBILITY ATOP GREAT BLUE HILL.... Visibility was very good after the fog dissipated this morning, with an average of 85 miles being seen. A light rain earlier on in the day left 0.04 inches in the gauge by 7 A.M.; and ended shortly after. Conditions were cool and dry, with the relative humidity dropping to a little over 40% by noontime. The high so far today is 77F, a degree below the daily normal maximum of 78F. The low since midnight is 61F, the same as the average daily minimum.   Today's Observations: 7 A.M. Weather: Light rain and overcast nimbostratus Temperature: 62F; Dew Point: 61F; Wind: S at 6 kts, Wind: Light Sea-level pressure: 29.97 ins. Hg, rising, then more rapidly Visibility: 40 miles, distant fog 6-hr Max temp: 69F 6-hr Min temp: 61F 24-hr Precip: 0.04 ins. BHO SA 1155 E110 OVC 40R- 149/62/61/3106/997/ DSNT FG ALQDS R-CTD WND LGT/ 8/02/ 51017 10069 20061 10 A.M. Weather: Overcast altocumulus with a few cumulus Temperature: 68F; Dew Point: 62F; Wind: WNW at 5 kts, Wind: Light Sea-level pressure: 29.99 ins. Hg, falling then rising Visibility: 85 miles 3-hr Precip: Trace BHO SA 1455 E110 OVC 85 155/68/62/2905/999/ FEW CU ALQDS WND LGT/ 8/17/ 600// 50006 1 P.M. Weather: Broken altocumulus with a few cumulus Temperature: 77F; Dew Point: 56F; Wind: WNW at 6 kts, Wind: Light Sea-level pressure: 29.96 ins. Hg, falling steadily Visibility: 80 miles 6-hr Max temp: 77F 6-hr Min temp: 62F 6-hr Precip: Trace BHO SA 1755 E130 BKN 80 148/77/56/3006/996/ FEW CU ALQDS WND LGT/ 8/170 600// 56007 10077 20062 SUMMARY FOR THURSDAY, AUGUST 22, 2019 TEMPERATURE (DEGREES F) MAX.....88   NORMAL.....79 MIN.....68   NORMAL.....61 MEAN....78   NORMAL.....70 DEPARTURE FROM 30-YEAR NORMAL......................+8 TOTAL DEPARTURE FOR THE MONTH.....................+45 [+1.8 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............13   DEPARTURE.........+7 TOTAL COOLING UNITS FOR THE MONTH.............182   DEPARTURE........+38 TOTAL COOLING UNITS FOR THE SEASON............593   DEPARTURE........+98 TOTAL COOLING UNITS LAST SEASON TO DATE.......670   DEPARTURE........-77 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................25 W   AT  3:36 P.M.                    AERO.........................21 W   AT  3:36 P.M.                    ASOS.........................25 W   AT  3:37 P.M.                    DAVIS........................26 W   AT  3:35 P.M. RMY 26 FASTEST MILE FOR YESTERDAY......................17 W   AT  2:24 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................17 W   AT  3:38 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 W   AT  3:37 P.M. AVERAGE WIND SPEED AND DIRECTION..............9.2 SW                    ASOS.......................9.9                    DAVIS......................9.5 WSW [252 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.04  DEPARTURE......-0.08                          ASOS..............0.02 TOTAL PRECIPITATION FOR THE MONTH..........1.02  DEPARTURE......-1.91                          ASOS..............0.96 TOTAL PRECIPITATION FOR THE YEAR..........36.34  DEPARTURE......+2.34                          ASOS.............36.24 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  85/68/77/+7/0.12/.../..               33 SW  AERO 32 SW  RMY 33 8/22  88/68/78/+8/0.00/.../..               25 W   AERO 21 W   RMY 26 8/23 Low temp since midnight is 61F; normal low is 62F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 23 HIGH 88F IN 1918, 1947, 1949, 1996 LOW 45F IN 1923 PRECIP 2.09 INCHES IN 2010 PEAK GUST 60e MPH NW IN 1940 RECORDS FOR AUGUST 24 HIGH 92F IN 1947 LOW 43F IN 1971 PRECIP 2.40 INCHES IN 2010 PEAK GUST 54 MPH W IN 1986 TODAY'S REPORT PREPARED BY: Benjamin Turner