BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, OCTOBER 1, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME AFTERNOON RAIN AND FOG ATOP GREAT BLUE HILL.... Rain started around noontime today, leaving .03 inches in the gauge by the 1 P.M. observation. Fog has brought visibility down to a half mile. A wind shift from W-NE was observed shortly before the rain. The maximum temperature so far today is 65F, a degree below the normal of 66F. The low since midnight is 55F, 6 degrees above the daily normal minimum of 49F. Today's Observations: 7 A.M. Weather: Broken altocumulus Temperature: 60F; Dew Point: 57F; Wind: SSW at 10G15 kts Sea-level pressure: 30.31 ins. Hg, rising, then more rapidly Visibility: 40 miles 6-hr Max temp: 60F 6-hr Min temp: 55F 24-hr Precip: 0.00 ins. BHO SA 1155 E120 BKN 40 264/60/57/2010G15/031/ 8/070 53007 10060 20055 10 A.M. Weather: Overcast stratus Temperature: 65F; Dew Point: 60F; Wind: W at 8G14 kts Sea-level pressure: 30.32 ins. Hg, rising steadily Visibility: 40 miles 3-hr Precip: 0.00 ins. BHO SA 1455 E20 OVC 40 268/65/60/2708G12/032/ 8/6// 51004 1 P.M. Weather: Fog, light rain becoming drizzle Temperature: 57F; Dew Point: 57F; Wind: NE at 8G14 kts Sea-level pressure: 30.31 ins. Hg, falling, then more slowly Visibility: 1/2 mile, fog 6-hr Max temp: 65F 6-hr Min temp: 56F 6-hr Precip: 0.03 ins. BHO SA 1755 W3 X 1/2L-F 264/57/57/0408G14/031/ R- BCMG LUNK/ 8//// 60003 58004 10065 20056 SUMMARY FOR SUNDAY, SEPTEMBER 30, 2018 TEMPERATURE (DEGREES F) MAX.....68 NORMAL.....66 MIN.....48 NORMAL.....49 MEAN....58 NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL........................0 TOTAL DEPARTURE FOR THE MONTH......................+78 [+2.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............7 DEPARTURE.........-1 TOTAL HEATING UNITS FOR THE MONTH..............87 DEPARTURE........-30 TOTAL HEATING UNITS FOR THE SEASON.............87 DEPARTURE........-55 TOTAL HEATING UNITS LAST SEASON TO DATE........78 DIFFERENCE........-6 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0 DEPARTURE..........-1 TOTAL COOLING UNITS FOR THE MONTH.............110 DEPARTURE.........+50 TOTAL COOLING UNITS FOR THE SEASON............863 DEPARTURE........+266 TOTAL COOLING UNITS LAST SEASON TO DATE.......707 DIFFERENCE.......+156 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................20 W AT 1:18 P.M. AERO.........................16 W AT 1:28 P.M. ASOS.........................19 W AT 1:18 P.M. DAVIS........................19 W AT 1:18 P.M. RMY N/A FASTEST MILE FOR YESTERDAY......................12 NW AT 6:21 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................14 W AT 12:52 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................14 W AT 12:52 P.M. AVERAGE WIND SPEED AND DIRECTION...............8.1 W ASOS........................8.6 DAVIS.......................8.7 WNW [292 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........9.13 DEPARTURE......+5.07 ASOS..............9.40 TOTAL PRECIPITATION FOR THE YEAR..........47.08 DEPARTURE......+8.18 ASOS.............48.92 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 9/01 75/58/67/-1/0.00/521/66 17 NE AERO 15 NE RMY 16 9/02 83/61/72/+4/0.00/684/87 20 SSW AERO 18 SSW RMY N/A 9/03 92/68/80/+13/0.00/650/83 24 WSW AERO 22 WSW RMY 25 9/04 88/70/79/+12/0.00/695/89 17 W AERO 16 W RMY 17 9/05 89/67/78/+11/0.00/638/82 23 SSW AERO 23 SSW RMY 25 9/06 92/70/81/+14/0.56/488/63 29 NNW AERO 29 NNW RMY N/A TSTM 9/07 70/63/67/+1/0.01/000/00 24 NE AERO 22 NE RMY N/A 9/08 68/54/61/-5/0.00/031/04 22 NE AERO 18 NE RMY 21 9/09 61/53/57/-9/0.00/000/00 23 NE AERO 21 NE RMY N/A 9/10 62/56/59/-6/..../000/00 30 E AERO 28 E RMY 28 9/11 75/61/68/+3/..../000/00 23 E AERO 21 E RMY N/A TSTM 9/12 69/63/66/+1/..../000/00 21 ENE AERO 21 ENE RMY 21 TSTM 9/13 68/62/65/+1/..../091/12 21 NE AERO 21 NE RMY N/A TSTM 9/14 75/61/68/+4/..../233/31 13 NE AERO 12 ENE RMY 12 9/15 76/62/69/+5/0.01/218/29 14 SW AERO 13 SW RMY 13 9/16 84/61/73/+10/..../695/93 15 S AERO 14 S RMY N/A 9/17 82/64/73/+10/..../372/50 22 SSW AERO 22 SSW RMY N/A 9/18 74/67/71/+9/..../000/00 31 SSW AERO 30 SSW RMY N/A TSTM 9/19 66/57/62/0/..../007/01 28 NE AERO 25 NE RMY 26 9/20 63/55/59/-3/..../.../.. 22 NE AERO 21 NE RMY 19 9/21 70/55/63/+2/..../.../.. 37 SSW AERO 37 SSW RMY 41 9/22 70/51/61/0/..../.../.. 37 SW AERO 36 SW RMY 30 9/23 60/47/54/-6/..../.../.. 14 N AERO 13 N RMY N/A 9/24 55/50/53/-7/..../.../.. 37 ENE AERO 35 ENE RMY 35 9/25 68/51/60/0/..../.../.. 36 SE AERO 37 SE RMY 38 9/26 79/66/73/+14/..../.../.. 35 SSW AERO 37 SSW RMY 37 9/27 66/56/61/+2/..../.../.. 26 NNE AERO 25 NNE RMY 28 9/28 56/52/54/-4/..../.../.. 24 NNE AERO 21 NNE RMY 23 9/29 71/50/61/+3/..../.../.. 20 NW AERO 18 NW RMY 20 9/30 68/48/58/0/..../.../.. 20 W AERO 16 W RMY N/A 10/1 Low temp since midnight is 48F; normal low is now 49F 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 OCTOBER 1 HIGH 85F IN 1927 LOW 30F IN 1992 PRECIP 1.63 INCHES IN 2014 PEAK GUST 68e MPH SSE IN 1977 RECORDS FOR OCTOBER 2 HIGH 85F IN 1968 LOW 29F IN 1899 PRECIP 1.75 INCHES IN 1984 PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984 TODAY'S REPORT PREPARED BY: Benjamin Turner