BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, SEPTEMBER 9, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME EXCELLENT VISIBILITY DAY ON TOP OF GREAT BLUE HILL... Humidity has stayed relatively low, allowing for 80 mile visibility to persist from 7:00 A.M. through 1:00 P.M. today. Temperatures have reached a maximum so far of 61F, 13 degrees lower than our normal high of 74F. Today has been windier than the past few days so far, with frequent gusts over 12 knots all day. Cloudy skies continued through 1:00 P.M., with a consistent overcast layer. Today's Observations: 7 A.M. Weather: Scattered stratocumulus, overcast cirrostratus Temperature: 55F; Dew Point: 47F; Wind: N at 8G13 kts Sea-level pressure: 30.28 ins. Hg, rising, then more slowly Visibility: 80 miles 6-hr Max temp: 55F 6-hr Min temp: 53F 24-hr Precip: 0.00 ins. BHO SA 1155 50 SCT E250 OVC 80 254/55/47/0108G13/028/ 8/506 51014 10055 20053 10 A.M. Weather: Broken altostratus, overcast cirrostratus Temperature: 59F; Dew Point: 47F; Wind: ENE at 11G18 kts Sea-level pressure: 30.31 ins. Hg, rising then falling Visibility: 80 miles 3-hr Precip: 0.00 ins. BHO SA 1455 E160 BKN 250 OVC 80 265/59/47/0611G18/031/ 8/026 50011 1 P.M. Weather: Broken stratocumulus, overcast altostratus sun dimly visible Temperature: 59F; Dew Point: 45F; Wind: NE at 11G18 kts Sea-level pressure: 30.32 ins. Hg, rising then steady Visibility: 80 miles 6-hr Max temp: 61F 6-hr Min temp: 55F 6-hr Precip: 0.00 ins. BHO SA 1755 E180 BKN 220 OVC 80 269/59/45/0511G18/032/ 8/41/ 51004 10061 20055 SUMMARY FOR SATURDAY, SEPTEMBER 8, 2018 TEMPERATURE (DEGREES F) MAX.....68 NORMAL.....74 MIN.....54 NORMAL.....57 MEAN....61 NORMAL.....66 DEPARTURE FROM 30-YEAR NORMAL.......................-5 TOTAL DEPARTURE FOR THE MONTH......................+49 [+5.9 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0 DEPARTURE..........-3 TOTAL COOLING UNITS FOR THE MONTH..............69 DEPARTURE.........+42 TOTAL COOLING UNITS FOR THE SEASON............822 DEPARTURE........+258 TOTAL COOLING UNITS LAST SEASON TO DATE.......621 DEPARTURE........+201 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.....................22 NE AT 10:39 A.M. AERO..........................18 NE AT 10:27 A.M. ASOS..........................22 NE AT 10:10 A.M. DAVIS.........................21 NE AT 10:09 A.M. RMY 21 FASTEST MILE FOR YESTERDAY.......................15 NE AT 12:20 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE....................15 NE AT 11:12 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...................15 NE AT 11:12 A.M. AVERAGE WIND SPEED AND DIRECTION................8.2 N ASOS.........................8.7 DAVIS........................8.6 N [1 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE......-0.11 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.57 DEPARTURE......-0.39 ASOS..............0.53 TOTAL PRECIPITATION FOR THE YEAR..........38.52 DEPARTURE......+2.72 ASOS.............40.05 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 9/1 75/58/67/-1/0.00/.../.. 17 NE AERO 15 NE RMY 16 9/2 83/61/72/+4/0.00/.../.. 20 SSW AERO 18 SSW RMY N/A 9/3 92/68/80/+13/0.00/.../.. 24 WSW AERO 22 WSW RMY 25 9/4 88/70/79/+12/0.00/.../.. 17 W AERO 16 W RMY 17 9/5 89/67/78/+11/0.00/.../.. 23 SSW AERO 23 SSW RMY 25 9/6 92/70/81/+14/..../.../.. 29 NNW AERO 29 NNW RMY N/A 9/7 70/63/67/+1/..../.../.. 24 NE AERO 22 NE RMY N/A 9/8 68/54/61/-5/0.00/.../.. 22 NE AERO 18 NE RMY 21 9/9 Low temp since midnight is 53F; normal low is now 57F DAILY RECORDS FOR SEPTEMBER 09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F, BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959 09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F, TIES PREVIOUS RECORD OF 92F SET IN 1900 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 9 HIGH 92F IN 2015 LOW 41F IN 1938 PRECIP 1.97 INCHES IN 1969 PEAK GUST 52 MPH WNW IN 1969, NW IN 1978 RECORDS FOR SEPTEMBER 10 HIGH 90F IN 1931,1989 LOW 41F IN 1956 PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER) PEAK GUST 48 MPH NW IN 1972 TODAY'S REPORT PREPARED BY: Samantha Richard