BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JANUARY 11, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME ABOVE SEASONABLE TEMPERATURES CAUSES RAPID SNOW MELT.... Wind from the south has brought above seasonable temperatures today. Yesterday we were very close to seasonable but temperatures began to rise last night around 10:00 P.M. and have continued to rise all day with a high so far of 49F. This 15 balmy degrees above the daily normal of 34F. These warm temperatures are causing the snow on ground to melt rapidly leaving us with 7 ins. by 1:00 P.M. The wind picked up and the sky became overcast this afternoon as the pressure began to drop. Visibility was limited to 35 miles today due to a lingering distant fog. Today's Observations: 7 A.M. Weather: Broken stratus, broken altocumulus Temperature: 39F; Dew Point: 37F; Wind: SSW at 17G22 kts Sea-level pressure: 30.37 ins. Hg, falling, then more quickly Visibility: 40 miles, distant fog in all directions 6-hr Max temp: 32F 6-hr Min temp: 39F 24-hr precip: 0.00 ins. 24-hr snowfall: 0.00 ins. Snow depth: 9 ins. BHO SA 1155 E25 BKN 100 BKN 40 284/39/37/2117G22/037/ DSNT FG ALQDS/ 8/670 4/009 58006 10032 20039 10 A.M. Weather: Broken stratus Temperature: 44F; Dew Point: 41F; Wind: SSW at 16G22 kts Sea-level pressure: 30.35 ins. Hg, rising unsteadily Visibility: 35 miles, distant fog in all directions 3-hr precip: 0.00 ins. 3-hr snowfall: 0.00 ins. BHO SA 1455 E8 BKN 35 276/44/41/2016G22/035/ DSNT FG ALQDS/ 8/600 51008 1 P.M. Weather: Scattered stratus, overcast altostratus break in overcast N-NNE, sun dimly visible Temperature: 49F; Dew Point: 44F; Wind: SSW at 16G22 kts Sea-level pressure: 30.29 ins. Hg, falling, then more quickly Visibility: 35 miles, distant fog in all directions 6-hr Max temp: 49F 6-hr Min temp: 39F 6-hr precip: 0.00 ins. 6-hr snowfall: 0.0 ins. Snow depth: 7 ins. BHO SA 1755 15 SCT E49 OVC 35 258/49/44/2016G22/029/ BINOVC N-NNE SUN DMLY VSBL DSNT FG ALQDS/ 8/6/// 4/007 58018 10049 20039 PRELIMINARY STATS FOR DECEMBER 2017 TEMPERATURE, Deg. F Avg. Max. 33.9 [-5.2] Avg. Min. 21.2 [-2.4] Mean 27.6 [-3.7] Corrected mean: 27.2 Max. for month: 58 on the 5TH Min. for month: -3 on the 29TH HEATING DEGREE DAYS Total heating units: 1153 [+110] Total for the season: 2122 [-183] Total for last season: 2032 PRECIPITATION, Inches Total: 3.08 [-1.81] Greatest in 24 hrs: 0.78 in. on the 22nd-23rd SNOWFALL, Inches Total: 9.3 [-4.1] WIND, mph Avg. uncorrected wind speed: 11.6 Avg. corrected wind speed: 12.0 Prevailing wind direction: W @ 23% Peak gust and direction: 62 S on the 5th SUNSHINE: Astronomical total minutes: 7367 minutes of possible 16994 or 43% Campbell-Stokes card minutes: 7140 minutes of possible 16470 or 43% SUMMARY FOR WEDNESDAY, JANUARY 10, 2018 TEMPERATURE (DEGREES F) MAX.....36 NORMAL.....34 MIN.....20 NORMAL.....17 MEAN....28 NORMAL.....25 DEPARTURE FROM 30-YEAR NORMAL...........................+3 TOTAL DEPARTURE FOR THE MONTH.........................-106 [-10.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY.............37 DEPARTURE..........-3 TOTAL HEATING UNITS FOR THE MONTH............495 DEPARTURE........+106 TOTAL HEATING UNITS FOR THE SEASON..........2617 DEPARTURE.........-76 TOTAL HEATING UNITS LAST SEASON TO DATE.....2414 DIFFERENCE.......+203 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................30 W AT 11:37 P.M. AERO........................30 W AT 11:38 P.M. ASOS........................32 SW AT 11:38 P.M.* DAVIS.......................N/A* RMY N/A FASTEST MILE FOR YESTERDAY.....................23 W AT 11:59 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................23 SSW AT 11:57 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................N/A* AVERAGE WIND SPEED AND DIRECTION..............11.3 W ASOS.......................12.4* DAVIS.......................N/A* *ASOS and Davis anemometers malfunctioning ** Last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE......-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.68 DEPARTURE......+0.26 ASOS..............1.98 TOTAL PRECIPITATION FOR THE YEAR...........1.68 DEPARTURE......+0.26 ASOS..............1.98 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE........-0.5 TOTAL SNOWFALL FOR THE MONTH...............16.5 DEPARTURE.......+10.9 TOTAL SNOWFALL FOR THE SEASON..............25.8 DEPARTURE........+4.2 PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 1/01 11/-5/3/-24/0.00/0.0/.../.. 30 NW AERO 30 NW RMY 31 1/02 15/-2/7/-20/0.00/0.0/.../.. 26 W AERO 25 W RMY 26 1/03 28/11/20/-6/0.00/0.0/.../.. 23 WSW AERO 20 WSW RMY N/A 1/04 28/18/23/-3/1.66/16.5/000/00 54 NNW AERO 60 NNW RMY 64 1/05 18/2/10/-16/0.00/0.0/.../.. 53 W AERO 53 W RMY 57 1/06 10/-2/4/-22/0.00/0.0/.../.. 43 WSW AERO 47 WSW RMY 47 1/07 14/-8/3/23/0.00/0.0/.../.. 37 WNW AERO 35 WNW RMY N/A 1/08 33/14/24/T/T/.../.. 40 S AERO 40 S RMY 42 1/09 40/25/33/T/T/.../.. 37 W AERO 35 W RMY 33 1/10 36/20/28/0.00/0.0/.../.. 30 W AERO 30 W RMY N/A 1/11 Low temp since midnight is 32F; normal low is now 17F DAILY RECORDS FOR JANUARY 2018 01/04/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.5 INS. PREVIOUS RECORD WAS 8.6 INS. SET IN 1923 AND TIED IN 1942 01/07/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF -8F, PREVIOUS RECORD OF -7F WAS SET IN 1896 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2017 CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 12/01 50/35/43/+6/0.04/0.0/262/47 28 NW AERO 29 NW RMY 30 12/02 42/29/36/0/0.00/0.0/033/06 20 NNW AERO 18 NNW RMY N/A 12/03 42/32/37/+1/0.00/0.0/172/31 14 N AERO 10 N RMY N/A 12/04 43/32/38/+3/0.00/0.0/522/94 16 E AERO 14 E RMY N/A 12/05 58/34/46/+11/0.18/0.0/000/00 62 S AERO 66 S RMY 65 12/06 56/32/44/+9/0.54/0.0/160/29 52 S AERO 55 S RMY N/A 12/07 44/30/37/+3/0.00/0.0/540/98 25 WSW AERO 24 WSW RMY 25 12/08 38/28/33/-1/0.00/0.0/116/21 21 W AERO 18 W RMY 20 12/09 34/28/31/-3./0.70/5.5/000/00 23 NNW AERO 23 NNW RMY 23 12/10 35/27/31/-2/0.02/0.1/384/70 30 W AERO 30 W RMY 27 12/11 38/29/34/+1/0.00/0.0/301/55 23 W AERO 21 W RMY 22 12/12 43/31/37/+4/0.06/0.0/000/00 35 W AERO 31 W RMY N/A 12/13 31/18/25/-7/0.00/0.0/372/68 44 W AERO 44 W RMY 44 12/14 27/14/21/-11/T/T/257/47 35 WSW AERO 33 W RMY 34 12/15 24/12/18/-14/0.00/0.0/011/02 25 W AERO 23 W RMY N/A 12/16 32/17/25/-6/0.00/0.0/382/70 33 W AERO 35 W RMY 36 12/17 27/14/21/-10/0.00/0.0/425/78 21 NW AERO 21 NW RMY 20 12/18 35/20/28/-3/T/T/011/02 20 SSE AERO 16 SSE RMY 20 12/19 49/34/42/+12/0.00/0.0/185/34 36 WNW AERO 35 SW RMY 38 12/20 42/26/34/+4/T/0.0/447/82 41 W AERO 40 W RMY 45 12/21 32/23/28/-2/0.00/0.0/533/98 26 NW AERO 24 NW RMY 27 12/22 32/21/27/-2/0.08/T/000/00 18 E AERO 17 E RMY N/A 12/23 36/24/30/+1/0.70/T/000/00 31 WSW AERO 28 WSW RMY 31 12/24 35/29/32/+3/0.00/0.0/191/35 30 ENE AERO 25 ENE RMY N/A 12/25 35/21/28/0/0.73/3.2/098/18 50 W AERO 54 W RMY 47 12/26 24/13/19/-9/0.00/0.0/529/97 39 W AERO 39 W RMY 41 12/27 19/6/13/-15/0.00/0.0/534/98 28 WNW AERO 25 WNW RMY N/A 12/28 10/1/6/-22/0.00/0.0/546/100 37 WNW AERO 44 WNW RMY 43 12/29 13/-3/5/-22/0.00/0.0/164/30 25 W AERO 25 W RMY 27 12/30 14/1/8/-19/0.03/0.5/016/03 21 W AERO 18 W RMY 24 12/31 10/0/5/-22/0.00/0.0/175/32 32 WNW AERO 32 WNW RMY 35 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JANUARY 11 HIGH 59F IN 1975 LOW -7F IN 1968 PRECIP 1.58 INS. IN 2008 SNOW 10.2 INS. 1927 PEAK GUST 95e MPH S IN 1980 RECORDS FOR JANUARY 12 HIGH 59F IN 2017 LOW -15F IN 1886 PRECIP 2.04 INS. IN 2011 SNOW 18.2 INS. IN 2011 WIND 84e MPH S IN 1980 TODAY'S REPORT PREPARED BY: Kaitlin Geagan