BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, OCTOBER 3, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME OVERCAST AND COOL FOLLOWING LAST NIGHT'S RAIN.... Last night's rain left 0.42 inches in the gauge at the 7 A.M. observation. Trace amounts were seen from a passing shower between 11 A.M. and 12 A.M. Wind has remained relatively light throughout the day, shifting from NNE to E. Skies have remained overcast, but visibility is good at around 70 miles. The cold front that passed by yesterday brought temperatures well below normal. The high so far today is 51F, which is 14 degrees below the normal high of 65F. The low this morning was 47F, which is a degree below the normal low of 48F. PRELIMINARY STATS FOR SEPTEMBER 2019 TEMPERATURE, Deg. F Avg. Max. 73.6 [+2.0] Avg. Min. 54.5 [-0.1] Mean 61.4 [-1.7] 24-hour corrected mean: 63.4 Max. for month: 88F on the 23rd Min. for month: 43F on the 19th HEATING DEGREE DAYS Total heating units: 81 [-36] Total for the season: 93 [-49] Total for last season: 87 COOLING DEGREE DAYS Total cooling units: 58 [-2] Total for the season: 680 [+83] Total for last season: 863 PRECIPITATION, Inches Total: 1.27 [-2.79] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 10.3 mph Avg. corrected wind speed: 10.9 mph Prevailing wind direction: SSW [11%] Peak gust and direction: 39 W on the 2nd SUNSHINE: Campbell-Stokes card minutes: N/A Astronomical total minutes: N/A Today's Observations: 7 A.M. Weather: Broken stratocumulus, overcast altocumulus Temperature: 48F; Dew Point: 40F; Wind: NE at 10 kts, gusting to 18 kts Sea-level pressure: 30.20 ins. Hg, rising steadily Visibility: 70 miles 6-hr Max temp: 48F 6-hr Min temp: 47F 24-hr Precip: 0.42 ins. BHO SA 1155 E30 BKN 170 OVC 70 227/48/40/0410G18/020/ 8/87/ 70042 53020 10048 20047 10 A.M. Weather: Broken stratocumulus, overcast altocumulus Temperature: 50F; Dew Point: 40F; Wind: ENE at 12G19 kts Sea-level pressure: 30.20 ins. Hg, rising then falling Visibility: 75 miles 3-hr Precip: 0.00 ins. BHO SA 1455 E30 BKN 110 OVC 75 227/50/40/0712G19/020/ 8/87/ 58000 1 P.M. Weather: Broken stratocumulus, overcast altocumulus Temperature: 48F; Dew Point: 40F; Wind: E at 9 kts Sea-level pressure: 30.17 ins. Hg, rising then falling Visibility: 70 miles 6-hr Max temp: 51F 6-hr Min temp: 47F 6-hr Precip: Trace BHO SA 1755 E30 BKN 110 OVC 70 217/48/40/1009/017/ 8/87/ 600// 58010 10051 20047 SUMMARY FOR WEDNESDAY, OCTOBER 2, 2019 TEMPERATURE (DEGREES F) MAX.....74 NORMAL.....65 MIN.....49 NORMAL.....48 MEAN....62 NORMAL.....57 DEPARTURE FROM 30-YEAR NORMAL......................+5 TOTAL DEPARTURE FOR THE MONTH......................+8 [+3.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............3 DEPARTURE.........-6 TOTAL HEATING UNITS FOR THE MONTH...............8 DEPARTURE.........-3 TOTAL HEATING UNITS FOR THE SEASON............101 DEPARTURE........-58 TOTAL HEATING UNITS LAST SEASON TO DATE........99 DEPARTURE.........+2 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............680 DEPARTURE........+83 TOTAL COOLING UNITS LAST SEASON TO DATE.......863 DEPARTURE.......-183 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................30 ENE AT 10:42 P.M. AERO.........................25 ENE AT 10:42 P.M. ASOS.........................29 NNE AT 10:50 P.M. DAVIS........................29 NE AT 10:49 P.M. RMY 28 FASTEST MILE FOR YESTERDAY......................20 ENE AT 1:32 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................20 NE AT 10:58 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................20 ENE AT 1:30 P.M. AVERAGE WIND SPEED AND DIRECTION...............11.5 ENE ASOS........................11.6 DAVIS.......................12.0 NNE [23 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.42 DEPARTURE......+0.27 ASOS..............0.41 TOTAL PRECIPITATION FOR THE MONTH..........0.48 DEPARTURE......+0.17 ASOS..............0.47 TOTAL PRECIPITATION FOR THE YEAR..........38.90 DEPARTURE......-0.50 ASOS.............38.70 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 73/56/65/-3/0.00/703/89 21 ENE AERO 14 ENE RMY 18 9/02 75/57/66/-2/0.37/165/21 39 W AERO 41 W RMY 41 9/03 77/61/69/+2/0.00/643/82 18 S AERO 16 S RMY N/A 9/04 83/61/72/+5/0.00/375/48 30 SW AERO 28 SW RMY 30 9/05 68/54/61/-6/0.00/513/66 23 NW AERO 17 NW RMY N/A 9/06 65/56/61/-6/0.03/054/07 37 ENE AERO 36 ENE RMY 36 9/07 70/51/61/-5/0.27/325/42 37 N AERO 37 N RMY N/A 9/08 73/53/63/-3/0.00/631/82 25 W AERO 21 W RMY N/A 9/09 71/54/63/-3/0.00/537/70 17 SE AERO 16 SE RMY 16 9/10 73/57/65/0/0.00/207/27 25 S AERO 25 S RMY N/A 9/11 83/63/73/+8/0.00/419/55 31 SW AERO 32 SW RMY N/A 9/12 70/52/61/-4/0.11/015/02 29 ENE AERO 28 ENE RMY 28 9/13 65/49/57/-7/0.00/741/98 29 ENE AERO 27 ENE RMY 27 9/14 69/49/59/-5/0.19/030/04 36 S AERO 37 S RMY 37 9/15 78/62/70/+6/0.00/600/80 24 W AERO 23 W RMY 22 9/16 72/54/63/0/T/673/90 25 WNW AERO 23 WNW RMY 25 9/17 67/49/58/-5/0.00/611/82 23 NW AERO 23 N RMY N/A 9/18 61/49/55/-7/0.00/.../.. 26 NE AERO 25 NE RMY 25 9/19 67/43/55/-7/0.00/.../.. 17 NE AERO 18 NE RMY N/A 9/20 78/50/64/+2/0.00/.../.. 21 W AERO 18 W RMY 20 9/21 83/60/72/+11/0.00/.../.. 21 WNW AERO 18 WNW RMY N/A 9/22 85/62/74/+13/0.00/.../.. 24 SW AERO 23 SW RMY 25 9/23 88/65/77/+17/0.00/.../.. 29 SSW AERO 28 SSW RMY 29 9/24 76/56/66/+6/0.04/.../.. 26 W AERO 26 W RMY 27 9/25 73/50/62/+2/0.00/.../.. 22 W AERO 21 W RMY 21 9/26 79/55/67/+8/0.25/.../.. 38 SW AERO 37 SW RMY 39 9/27 72/50/61/+2/0.00/.../.. 23 S AERO 23 S RMY 22 9/28 78/55/67/+9/0.00/.../.. 31 S AERO 29 S RMY 30 9/29 75/53/64/+6/0.00/.../.. 24 NW AERO 23 NW RMY 23 9/30 62/49/56/-2/0.00/.../.. 23 NNE AERO 16 NNE RMY N/A 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 10/01 67/52/60/+3/0.06/.../.. 28 SW AERO 25 SSW RMY 29 10/02 74/49/62/+5/0.42/.../.. 30 ENE AERO 25 ENE RMY 28 10/03 The low since midnight is 47F, normal daily minimum is 48F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR OCTOBER 4 HIGH 84F IN 2007 LOW 28F IN 1888 PRECIP 1.87 INCHES IN 2011 PEAK GUST 59 MPH SSW IN 1990 TODAY'S REPORT PREPARED BY: Benjamin Turner