BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, OCTOBER 2, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME FOGGY CONDITIONS CONTINUE ON GREAT BLUE HILL.... Fog increased between the 7 A.M. and the 10 A.M. observations, decreasing visibility from a 1/2 mile to a 1/16 mile. A light drizzle persisted throughout the day, leaving 0.05 inches in the rain gauge at 1 P.M. We also measured 0.43 inches of rain this morning at 7 A.M. Wind remained light and from the east. The maximum temperature so far today is 58F, 7 degrees below the normal of 65F. The low since midnight is 53F, 7 degrees above the daily normal minimum of 48F. Today's Observations: 7 A.M. Weather: Fog, drizzle Temperature: 55F; Dew Point: 55F; Wind: E at 5 kts, Wind: Light Sea-level pressure: 30.27 ins. Hg, rising then falling Visibility: 1/2 mile, fog 6-hr Max temp: 55F 6-hr Min temp: 53F 24-hr Precip: 0.43 ins. BHO SA 1155 W3 X 1/2LF 250/55/55/0705/027/ WND LGT L CTD/ 8//// 70043 50002 10055 20053 10 A.M. Weather: Fog, drizzle Temperature: 55F; Dew Point: 55F; Wind: ENE at 6G14 kts, Wind: Light Sea-level pressure: 30.25 ins. Hg, falling steadily Visibility: 1/16 mile, fog 3-hr Precip: 0.03 ins. BHO SA 1455 W3 X 1/16LF 245/55/55/0606G14/025/ WND LGT L CTD/ 8//// 60003 58005 1 P.M. Weather: Fog, light drizzle Temperature: 57F; Dew Point: 57F; Wind: E at 5 kts, Wind: Light Sea-level pressure: 30.16 ins. Hg, falling, then more rapidly Visibility: 1/16 mile, fog 6-hr Max temp: 58F 6-hr Min temp: 54F 6-hr Precip: 0.05 ins. BHO SA 1755 W3 X 1/16L-F 214/57/57/0805/016/ WND LGT L-CTD/ 8//// 60005 58031 10058 20054 SUMMARY FOR MONDAY, OCTOBER 1, 2018 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....66 MIN.....53 NORMAL.....49 MEAN....59 NORMAL.....57 DEPARTURE FROM 30-YEAR NORMAL.......................+2 TOTAL DEPARTURE FOR THE MONTH........................2 [+1.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............6 DEPARTURE.........-2 TOTAL HEATING UNITS FOR THE MONTH...............6 DEPARTURE.........-2 TOTAL HEATING UNITS FOR THE SEASON.............93 DEPARTURE........-58 TOTAL HEATING UNITS LAST SEASON TO DATE.......104 DIFFERENCE.......-11 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0 DEPARTURE..........-1 TOTAL COOLING UNITS FOR THE MONTH...............0 DEPARTURE..........-1 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....................21 ENE AT 1:35 P.M. AERO.........................18 SSW AT 7:07 A.M. ASOS.........................21 SSW AT 7:07 A.M. DAVIS........................21 SSW AT 7:48 A.M. RMY 21 FASTEST MILE FOR YESTERDAY......................17 SSW AT 7:28 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................16 SSW AT 7:41 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................16 SW AT 7:28 A.M. AVERAGE WIND SPEED AND DIRECTION...............9.3 NE ASOS........................9.9 DAVIS.......................9.6 E [77 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.43 DEPARTURE......+0.27 ASOS..............0.43 TOTAL PRECIPITATION FOR THE MONTH..........0.43 DEPARTURE......+0.27 ASOS..............0.43 TOTAL PRECIPITATION FOR THE YEAR..........47.51 DEPARTURE......+8.45 ASOS.............49.35 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 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 PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/1 65/53/59/+2/..../.../.. 21 ENE AERO 18 SSW RMY N/A 10/2 Low temp since midnight is 48F; normal low is now 49F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR OCTOBER 3 HIGH 82F IN 1922 LOW 28F IN 1899 PRECIP 1.76 INCHES IN 1979 PEAK GUST 62 MPH WNW IN 1964 TODAY'S REPORT PREPARED BY: Benjamin Turner