BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, NOVEMBER 7, 2017 ALL TIMES ARE IN EASTERN STANDARD TIME COOLER OVERCAST AUTUMN DAY Temperatures dropped overnight to 37F which is one degree above the normal minimum temperature of 36F for the 7th of November. Also we measured 0.05 inches of precipitation. Scattered altocumulus in the morning were replaced by altostratus through out the day which resulted in overcast by 10 am with a break in overcast overhead. Pressure started to rise at the beginning of the day and later started to fall. Relative humidity were in the range of 61% to 67% which made the visibility 70 miles. PRELIMINARY STATS FOR OCTOBER 2017 TEMPERATURE, Deg. F Avg. Max. 68.0 [+7.7] Avg. Min. 51.7 [+8.8] Mean 59.9 [+8.3] 24-hour corrected mean: 59.2 Max. for month: 79F on 5th Min. for month: 35F on 17th HEATING DEGREE DAYS Total heating units: 175 [-246] Total for the season: 268 [-295] Total for last season: 421 COOLING DEGREE DAYS Total cooling units: 24 [+19] Total for the season: 731 [+129] Total for last season: 901 PRECIPITATION, Inches Total: 5.94 [+1.25] Greatest in 24 hrs: 3.12 on the 29th-30th WIND, mph Avg. uncorrected wind speed: 12.4 Avg. corrected wind speed: 12.8 Prevailing wind direction: S at 14% Peak gust and direction: 73 SE on 30th SUNSHINE: Campbell-Stokes card minutes: 11,520 minutes of possible 19,824 or 58% Astronomical total minutes: 11,928 minutes of possible 20,524 or 58% BHO Warmest Octobers, deg F (1885-2017): 1) 59.2 in 2017 2) 58.4 in 1947 3) 56.9 in 2007 4) 56.6 in 1971 5) 56.5 in 1963 6) 55.7 in 1946 7) 55.5 in 1995 8) 55.3 in 1990 Today's Observations: 7 A.M. Weather: Scattered altocumulus, few stratocumulus NE-SW Temperature: 37F; Dew Point: 28F; Wind: NNW at 10 kts Sea-level pressure: 30.21 ins. Hg, rising, then more slowly Visibility: 50 miles except 30 miles NE-SW 6-hr Max temp: 45F 6-hr Min temp: 37F 24-hr precip: 0.05 BHO SA 1155 100 SCT 50 230/37/28/3410/021/ FEW SC NE-SW VSBY 30 NE-SW/ 8/090/ 51029 MANUAL 70005 ASOS 70005 10045 20037 10 A.M. Weather: Overcast altostratus with a break overhead, few distant altocumulus ESE-S Temperature: 44F; Dew Point: 32F; Wind: NNW at 5 kts, Wind: Light Sea-level pressure: 30.21 ins. Hg, rising, then more slowly Visibility: 70 miles BHO SA 1455 E30 OVC 70 231/44/32/3305/021/ FEW DSNT AC ESE-S BINOVC OVHD WND LGT/ 8/5// 51010 1 P.M. Weather: Overcast altostratus, few distant cumulus N-SE Temperature: 45F; Dew Point: 34F; Wind: SSE at 3 kts, Wind: Light Sea-level pressure: 30.18 ins. Hg, falling then more slowly Visibility: 70 miles 6-hr Max temp: 46F 6-hr Min temp: 38F BHO SA 1755 E30 OVC 70 221/45/34/1503/018/ FEW DSNT CU N-SE WND LGT/ 8/12// 56010 10046 20038 SUMMARY FOR MONDAY, NOVEMBER 6, 2017 TEMPERATURE (DEGREES F) MAX.....64 NORMAL.....53 MIN.....47 NORMAL.....36 MEAN....56 NORMAL.....45 DEPARTURE FROM 30-YEAR NORMAL........................+11 TOTAL DEPARTURE FOR THE MONTH........................+51 [+8.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............9 DEPARTURE..........-9 TOTAL HEATING UNITS FOR THE MONTH..............66 DEPARTURE.........-50 TOTAL HEATING UNITS FOR THE SEASON............334 DEPARTURE........-346 TOTAL HEATING UNITS LAST SEASON TO DATE.......521 DIFFERENCE.......-187 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................26 S AT 11:29 P.M. AERO........................24 S AT 11:31 P.M. ASOS........................28 S AT 11:31 P.M. DAVIS.......................25 S AT 11:53 P.M. RMY N/A FASTEST MILE FOR YESTERDAY.....................21 S AT 11:29 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................22 S AT 11:31 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................19 S AT 11:31 P.M. AVERAGE WIND SPEED AND DIRECTION............12.1 E ASOS.....................11.8 DAVIS....................11.3 SE [134 DEG.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05 DEPARTURE......-0.10 ASOS..............0.05 TOTAL PRECIPITATION FOR THE MONTH..........0.06 DEPARTURE......-0.87 ASOS..............0.06 TOTAL PRECIPITATION FOR THE YEAR..........47.86 DEPARTURE......+3.16 ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings 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 65/42/54/-3/0.00/697/99 18 WNW AERO 16 NW RMY N/A 10/2 65/46/56/-1/0.00/687/98 21 NNW AERO 21 NNW RMY 21 10/3 67/50/59/+3/0.00/677/97 21 S AERO 21 S RMY N/A 10/4 75/50/63/+7/0.00/660/95 30 SSW AERO 30 SW RMY 32 10/5 79/60/70/+14/0.00/429/62 28 SW AERO 26 SW RMY N/A 10/6 73/57/65/+10/T/352/51 15 NW AERO 14 NW RMY 15 10/7 75/59/67/+12/T/344/50 29 S AERO 30 SSW RMY N/A 10/8 71/67/69/+15/0.23/007/01 33 S AERO 36 SSW RMY 37 10/9 71/68/70/+16/0.22/000/00 43 S AERO 41 S RMY 45 10/10 76/61/69/+15/0.00/637/94 21 WNW AERO 20 WNW RMY 21 10/11 68/55/62/+9/0.00/169/25 29 ENE AERO 25 ENE RMY 29 10/12 58/48/50/0/T/545/81 30 NE AERO 28 ENE RMY 30 10/13 64/48/56/+3/0.00/637/95 20 E AERO 16 E RMY 17 10/14 66/54/60/+8/0.04/067/10 15 SSE AERO 13 SSE RMY 13 10/15 72/58/65/+13/0.01/146/22 39 SSW AERO 36 SSW RMY 40 10/16 66/39/53/+2/T/007/01 28 NNW AERO 25 NNW RMY 29 10/17 57/35/46/-5/0.00/659/100 25 S AERO 22 S RMY 25 10/18 70/45/58/+7/0.00/649/99 25 SW AERO 23 SW RMY 22 10/19 72/52/62/+12/0.00/614/94 31 SSW AERO 30 SSW RMY 32 10/20 68/53/61/+11/0.00/651/100 28 WNW AERO 25 WNW RMY 29 10/21 77/52/65/+15/0.00/648/100 21 NW AERO 20 NW RMY 18 10/22 73/54/64/+15/0.00/561/80 21 ENE AERO 16 ENE RMY 17 10/23 69/50/60/+11/T/103/16 24 SSE AERO 24 SSE RMY N/A 10/24 73/64/69/+20/0.25/032/05 50 SSE AERO 51 S RMY N/A 10/25 69/57/63/+14/1.57/000/00 50 SSW AERO 50 SSW RMY N/A 10/26 60/44/52/+4/0.50/000/00 40 W AERO 41 W RMY 39 10/27 60/42/51/+3/0.00/632/100 28 W AERO 25 W RMY N/A 10/28 66/47/57/+9/0.00/548/87 24 S AERO 23 S RMY 26 10/29 62/55/59/+12/1.47/000/00 62 ESE AERO 63 ESE RMY N/A 10/30 63/48/56/+9/1.65/193/31 73 SE AERO 68 SE RMY N/A 10/31 56/43/50/+3/0.00/622/100 35 WSW AERO 33 WSW RMY 35 DAILY RECORDS FOR OCTOBER 10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F, BREAKS PREVIOUS RECORD OF 60F SET IN 1944 10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F, BREAKS PREVIOUS RECORD OF 61F SET IN 2011 10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F, BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990 AND TIED ON OCTOBER 8, 2017 10/24/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F, BREAKS PREVIOUS RECORD OF 61F SET IN 2001 10/30/17: DAILY MAXIMUM PEAK GUST 63 KTS (73 MPH) SE BREAK PREVIOUS RECORD OF 57 KTS (66 MPH) NW SET IN 1963 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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 11/1 53/39/46/0/0.00/.../.. 25 SE AERO 24 SE RMY 25 11/2 71/49/60/+14/0.00/.../.. 28 SSE AERO 25 SSE RMY 27 11/3 74/47/61/+15/T/.../.. 35 WNW AERO 35 WNW RMY 38 11/4 54/39/47/+2/0.00/.../.. 31 NW AERO 31 NW RMY N/A 11/5 61/46/54/+9/.../.../.. 26 S AERO 24 S RMY N/A 11/6 64/47/56/+11/.../.../.. 32 S AERO 28 SSW RMY 35 11/7 Low temp since midnight is 37F; normal low is now 36F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 7 HIGH 75 IN 1938 LOW 21 IN 1930 PRECIP 2.02 INCHES IN 1953 SNOWFALL 3.5 IN 2012 PEAK GUST 69e ENE IN 1953 RECORDS FOR NOVEMBER 8 HIGH 72 IN 1938 LOW 20 IN 1921 PRECIP 2.24 INCHES IN 1972 SNOWFALL 4.0 IN 1894 PEAK GUST 72e SE IN 1947 TODAY'S REPORT PREPARED BY: Afshin Pourmokhtarian / Kaitlin Geagan