BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, NOVEMBER 9, 2017 ALL TIMES ARE IN EASTERN STANDARD TIME OVERNIGHT LOWS BRING FIRST FROST OF THE SEASON... We had another chilly start to the day on top of Great Blue Hill with an overnight minimum temperature of 31F. This is four degrees below our daily normal of 35F. With temperatures dropping below freezing we observed our first frost layer early this morning. Temperatures continue to be below seasonable with a maximum temperature for yesterday of 43F. This is ten degrees below our normal of 53F. We have had a high so far today of 49F by 1:00 PM EST. Winds have been light to moderate with a shift in direction before noon from northeast to southeast. Today's Observations: 7 A.M. Weather: Clear, few cumulus NE-SW, few Altocumulus ESE-S, patches of ground fog below summit Temperature: 32F; Dew Point: 25F; Wind: N at 10 kts Sea-level pressure: 30.28 ins. Hg, rising then falling Visibility: 70 miles 6-hr Max temp: 34F 6-hr Min temp: 31F 24-hr precip: 0.00 inches BHO SA 1155 CLR 70 253/32/25/0110/028/ FEW CU ENE-S FEW AC ESE-S PTCHS GF BLO SMT E AND W/ 8/160 50006 10034 20031 10 A.M. Weather: Scattered altocumulus, few distant cumulus N-S Temperature: 43F; Dew Point: 30F; Wind: NE at 5 kts, Wind: Light Sea-level pressure: 30.25 ins. Hg, falling, then more quickly Visibility: 65 miles, distant haze in all directions BHO SA 1455 120 SCT 65 245/43/30/0505/025/ FEW CU DSNT N-S DSNT HZ ALQDS WND LGT/ 8/130 56008 1 P.M. Weather: Scattered altocumulus, few cumulus ENE-E Temperature: 48F; Dew Point: 32F; Wind: SE at 5 kts, Wind: Light Sea-level pressure: 30.14 ins. Hg, falling, then more quickly Visibility: 70 miles 6-hr Max temp: 49F 6-hr Min temp: 32F BHO SA 1755 120 SCT 70 208/48/32/1305/014/ FEW CU ENE-N WND LGT/ 8/130 58037 10049 20032 SUMMARY FOR WEDNESDAY, NOVEMBER 8, 2017 TEMPERATURE (DEGREES F) MAX.....43 NORMAL.....53 MIN.....34 NORMAL.....36 MEAN....39 NORMAL.....44 DEPARTURE FROM 30-YEAR NORMAL.........................-5 TOTAL DEPARTURE FOR THE MONTH........................+40 [+4.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............26 DEPARTURE...........5 TOTAL HEATING UNITS FOR THE MONTH.............116 DEPARTURE.........-42 TOTAL HEATING UNITS FOR THE SEASON............384 DEPARTURE........-337 TOTAL HEATING UNITS LAST SEASON TO DATE.......561 DIFFERENCE.......-177 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................26 N AT 9:57 A.M. AERO........................23 N AT 9:58 A.M. ASOS........................29 NNE AT 9:59 A.M. DAVIS.......................25 NNE AT 9:59 A.M. RMY 27 FASTEST MILE FOR YESTERDAY.....................16 N AT 9:58 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................17 NNE AT 9:59 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................16 NNE AT 10:04 A.M. AVERAGE WIND SPEED AND DIRECTION.............10.1 N ASOS......................11.0 DAVIS......................9.5 NNE [026 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..........0.25 DEPARTURE......-0.99 ASOS..............0.24 TOTAL PRECIPITATION FOR THE YEAR..........48.05 DEPARTURE......+3.04 ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings 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/+9/0.01/.../.. 26 S AERO 24 S RMY N/A 11/6 64/47/56/+11/0.05/.../.. 32 S AERO 28 SSW RMY 35 11/7 46/35/41/-4/.../.../.. 26 NNW AERO 23 N RMY 26 11/8 43/34/39/-5/.../.../.. 26 N AERO 23 N RMY 27 11/9 Low temp since midnight is 31F; normal low is now 35F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 9 HIGH 72 IN 1975 LOW 17 IN 1971 PRECIP 1.37 INCHES IN 1969 SNOWFALL 0.2 IN 1921,1923 PEAK GUST 73e S IN 1943 RECORDS FOR NOVEMBER 10 HIGH 75 IN 1931 LOW 20 IN 2004 PRECIP 2.11 INCHES IN 1888 SNOWFALL 2.2 IN 1987 PEAK GUST 83e S IN 1942 TODAY'S REPORT PREPARED BY: Kaitlin Geagan