BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, AUGUST 11, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME COOLER THAN AVERAGE TEMPERATURES WITH EXCELLENT VISIBILITY AND INCREASING AFTERNOON CLOUDS…. We observed excellent visibly throughout the day, with 80 miles on average being seen. Wind reduced before the 10 A.M observation and then became fairly gusty later in the afternoon. The peak gust so far today is 25 mph. Furthermore, Clouds cover increased in the afternoon as a broken cumulus layer was observed. Conditions continued to be dry, with temperatures being cool for late summer. The high so far today is 77F, 3 degrees below the daily normal maximum of 80F. The low since midnight is 56F, 7 degrees below the average daily minimum of 63F. PRELIMINARY STATS FOR JULY 2019 TEMPERATURE, Deg. F Avg. Max. 84.6 [+3.8] Avg. Min. 65.6 [+2.7] Mean 75.1 [+3.2] 24-hour corrected mean: 74.5 Max. for month: 93F on the 20th, 30th Min. for month: 58F on the 1st, 23rd COOLING DEGREE DAYS Total cooling units: 322 [+100] Total for the season: 411 [+60] Total for last season: 455 PRECIPITATION, Inches Total: 5.45 [+1.43] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 8.8 Avg. corrected wind speed: 9.6 Prevailing wind direction: W at 14% Peak gust and direction: 44 W on 17th SUNSHINE: Campbell-Stokes card minutes: 18300 minutes of possible 26682 or 69% Astronomical total minutes: 19049 minutes of possible 27759 or 69% Today's Observations: 7 A.M. Weather:Scattered cirrostratus Temperature: 61F; Dew Point: 53F; Wind: WNW at 9 kts Sea-level pressure: 29.96 ins. Hg, steady, then rising Visibility: 80 miles 6-hr Max temp: 56F 6-hr Min temp: 61F 24-hr Precip: 0.00 ins. BHO SA 1155 250 SCT 80 148/61/53/2909/996/ 8/005 53020 10061 20056 10 A.M. Weather: Scattered cumulus Temperature: 60F; Dew Point: 54F; Wind: WNW at 4 kts Wind: Light Sea-level pressure: 29.95 ins. Hg, rising, then falling Visibility: 80 miles 3-hr Precip: 0.00 ins. BHO SA 1455 50 SCT 80 144/60/54/2904/995/ WND LGT/ 8/100 58004 1 P.M. Weather: Broken cumulus Temperature: 77F; Dew Point: 52F; Wind: WNW at 12G19 kts Sea-level pressure: 29.94 ins. Hg, falling, then steady Visibility: 80 miles 6-hr Max temp: 77F 6-hr Min temp: 61F 6-hr Precip: 0.00 ins. BHO SA 1755 60 BKN 80 142/77/52/2912G19/994/ 8/100 56002 10077 20061 SUMMARY FOR SATURDAY, AUGUST 10, 2019 TEMPERATURE (DEGREES F) MAX.....78 NORMAL.....80 MIN.....59 NORMAL.....63 MEAN....69 NORMAL.....71 DEPARTURE FROM 30-YEAR NORMAL......................-2 TOTAL DEPARTURE FOR THE MONTH.....................+11 [+0.9 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............4 DEPARTURE.........-4 TOTAL COOLING UNITS FOR THE MONTH..............80 DEPARTURE........+9 TOTAL COOLING UNITS FOR THE SEASON............491 DEPARTURE........+69 TOTAL COOLING UNITS LAST SEASON TO DATE.......596 DEPARTURE........-105 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................32 NW AT 12:12 P.M. AERO.........................28 NW AT 9:41 A.M. ASOS.........................31 W AT 12:12 P.M. DAVIS........................31 W AT 12:12 P.M. RMY 28 FASTEST MILE FOR YESTERDAY......................22 NW AT 12:08 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................20 W AT 12:40 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................21 W AT 11:18 A.M. AVERAGE WIND SPEED AND DIRECTION..............12.7 NW ASOS.......................12.7 DAVIS......................13.2 W [283 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..........0.78 DEPARTURE......-0.61 ASOS..............0.81 TOTAL PRECIPITATION FOR THE YEAR..........36.10 DEPARTURE......+3.65 ASOS.............36.09 PRELIMINARY CLIMATE SUMMARY FOR JULY 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 07/01 83/58/71/+1/0.00/896/98 21 NNW AERO 21 NNW RMY N/A 07/02 82/65/74/+4/0.00/329/36 23 W AERO 23 W RMY 23 07/03 89/67/78/+7/0.00/866/95 18 S AERO 18 S RMY 18 07/04 88/68/78/+7/0.00/748/82 17 SSW AERO M M RMY 17 07/05 87/69/78/+7/0.00/829/91 21 SW AERO M M RMY 21 07/06 90/71/81/+10/0.83/646/71 26 WNW AERO M M RMY N/A TSTM 07/07 78/64/71/0/0.00/827/91 30 NE AERO M M RMY N/A 07/08 79/59/69/-3/0.00/763/84 16 N AERO 18 SSW RMY N/A 07/09 85/61/73/+1/0.00/871/96 18 NW AERO 16 NW RMY 18 07/10 88/69/79/+7/0.00/607/67 20 ESE AERO 16 ESE RMY 17 07/11 81/67/74/+2/0.62/000/00 35 S AERO 33 S RMY 36 07/12 84/68/76/+4/0.00/316/35 31 WNW AERO 30 WNW RMY 32 07/13 85/65/75/+3/0.00/812/90 21 W AERO 20 WSW RMY 20 07/14 87/68/78/+6/0.00/702/78 25 W AERO 21 W RMY 23 07/15 82/63/73/+1/0.00/791/88 24 WNW AERO 23 WNW RMY 22 07/16 86/65/76/+4/0.00/682/76 23 W AERO 21 W RMY 21 07/17 90/70/80/+8/1.32/260/29 44 W AERO M M RMY 47 TSTM 07/18 72/61/67/-5/0.04/000/00 33 NE AERO 36 NE RMY 33 07/19 89/61/75/+3/0.00/580/65 24 WSW AERO 26 SW RMY 25 07/20 93/75/84/+12/0.00/802/90 21 WSW AERO 22 WSW RMY N/A 07/21 92/76/84/+12/0.00/729/82 31 W AERO 35 W RMY 31 07/22 81/64/73/+1/1.22/284/32 35 ENE AERO 37 ENE RMY 34 07/23 66/58/62/-10/0.86/009/01 30 NNE AERO 33 NNE RMY 30 07/24 77/60/69/-3/0.01/575/65 14 NE AERO 15 NE RMY N/A 07/25 80/61/71/-1/0.00/732/83 17 SSE AERO 23 N RMY 17 07/26 84/62/73/+1/0.00/730/83 22 SSE AERO 23 SSE RMY 20 07/27 83/64/74/+2/0.00/834/95 21 S AERO 23 S RMY 21 07/28 89/64/77/+5/0.00/710/81 25 WSW AERO 36 WSW RMY 26 07/29 89/71/80/+8/0.01/804/92 23 W AERO 25 W RMY 21 07/30 93/71/82/+10/0.00/767/88 24 S AERO 24 S RMY 23 07/31 90/68/79/+7/0.55/548/63 37 SW AERO 35 SW RMY 38 TSTM DAILY RECORDS FOR JULY 2019 7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F, BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015 7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F, BREAKS PREVIOUS RECORD OF 75F SET IN 1991 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/.../.. 18 NNW AERO 20 NW RMY 17 8/02 83/61/72/0/0.00/.../.. 18 WSW AERO 18 WSW RMY 18 8/03 84/66/75/+3/0.00/.../.. 25 SW AERO 26 SW RMY 25 8/04 83/66/75/+3/0.00/.../.. 21 NE AERO 23 SW RMY 25 8/05 81/58/70/-2/0.00/.../.. 20 S AERO 18 S RMY 19 8/06 79/63/71/-1/0.00/.../.. 15 S AERO 14 S RMY 17 8/07 82/66/74/+2/..../.../.. 32 SSW AERO 35 SSW RMY 35 8/08 84/67/76/+4/..../.../.. 30 SW AERO 24 WNW RMY 29 8/09 82/63/73/+1/..../.../.. 28 NW AERO 25 NW RMY 26 8/10 78/59/69/-2/..../.../.. 32 NW AERO 28 NW RMY 28 8/11 Low temp since midnight is 56F; normal low is 63F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 11 HIGH 97F IN 1944 LOW 49F IN 1972 PRECIP 3.13 INCHES IN 1990 PEAK GUST 44 MPH SW IN 1971 RECORDS FOR AUGUST 12 HIGH 99F IN 1944 LOW 48F IN 1930 PRECIP 1.89 INCHES IN 1979 PEAK GUST 50 MPH NE IN 1983 TODAY'S REPORT PREPARED BY: Nicholas Rousseau