BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JANUARY 18, 2018   ALL TIMES ARE IN EASTERN STANDARD TIME COOL AND CLOUDY MORNING WITH A MILD AND SUNNY  AFTERNOON.... A snow storm began yesterday morning just after 5:00 A.M. leaving 2.3 ins. on top of Great Blue  Hill. Today began with broken altocumulus clouds but cleared by mid-morning making for a sunny  with only a few altocumulus clouds. Temperatures  have been slightly below seasonable with a high  of 29F so far. The normal for today is 33F. Yesterday temperatures stayed fairly constant with a high of 32F and a low of 29F. This was due to the high moisture content in the air.   The humidity has decreased throughout the day today and we could see 70 miles of visibility by 1:00 P.M. Today's Observations: 7 A.M. Weather: Broken altocumulus, smoke layer along horizon Temperature: 17F; Dew Point: 17F; Wind: WNW at 8 kts Sea-level pressure: 29.96 ins. Hg, falling, then steady  Visibility: 40 miles  6-hr Max temp: 29F 6-hr Min temp: 16F 24-hr precip: 0.16 ins. 24-hr snowfall: 1.8 ins. Snow depth: 2 ins. BHO SA 1155 E200 BKN 40 144/17/17/2908/996/ NEW SNW PST  24 HRS 1.8 INS STORM TOTAL 2.3 INS K LYR ALG HRZN/  8/060 4/002 56003 MANUAL 70016 ASOS 70019 10029 20016 10 A.M. Weather: Clear, few altocumulus ENE-SSW,  smoke layer along horizon Temperature: 22F; Dew Point: 18F; Wind: ENE at WNW 5 kts, Wind: Light Sea-level pressure: 29.96 ins. Hg, falling then steady  Visibility: 45 miles 3-hr precip: 0.00 ins. 3-hr snowfall: 0.0 ins.  BHO SA 1455 CLR 45 145/22/18/3005/996/ FEW AC ENE-SSW K LYR  ALG HRZN WND LGT/ 8/060 53001   1 P.M. Weather: Clear, few altocumulus ENE-S smoke layer along horizon Temperature: 28F; Dew Point: 20F; Wind: NW at 11G17 kts Sea-level pressure: 29.86 ins. Hg, falling, then more slowly  Visibility: 70 miles 6-hr precip: 0.00 ins. 6-hr snowfall: 0.0 ins. 6-hr Max temp: 29F 6-hr Min temp: 16F BHO SA 1755 CLR 70 112/28/20/3111G17/986/ FEW AC ENE-S K LYR  ALG HRZN/ 8/060 4/002 58033 10029 20016  SUMMARY FOR WEDNESDAY, JANUARY 17, 2018 TEMPERATURE (DEGREES F) MAX.....32   NORMAL.....33 MIN.....29   NORMAL.....17 MEAN....31   NORMAL.....25 DEPARTURE FROM 30-YEAR NORMAL...........................+6 TOTAL DEPARTURE FOR THE MONTH..........................-61 [-3.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY.............34  DEPARTURE..........-6 TOTAL HEATING UNITS FOR THE MONTH............730  DEPARTURE.........+62 TOTAL HEATING UNITS FOR THE SEASON..........2852  DEPARTURE........-120 TOTAL HEATING UNITS LAST SEASON TO DATE.....2615  DIFFERENCE.......+237 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY...................20 SE  AT 3:33 A.M.                    AERO........................17 SE  AT 3:35 A.M.                    ASOS........................18 SSE AT 3:34 A.M.                    DAVIS.......................17 M   AT 2:58 A.M.* RMY N/A  FASTEST MILE FOR YESTERDAY.....................14 SE  AT 3:05 A.M.  MAXIMUM 2-MINUTE ASOS AVERAGE..................14 SE  AT 3:07 A.M.   MAXIMUM 2-MINUTE DAVIS AVERAGE.................14 M   AT 3:07 A.M.* AVERAGE WIND SPEED AND DIRECTION..............7.5 NW                    ASOS.......................8.2                    DAVIS......................7.0* *DAVIS DIRECTON MALFUNCTIONING PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.16  DEPARTURE......+0.01                          ASOS..............0.19 TOTAL PRECIPITATION FOR THE MONTH..........4.19  DEPARTURE......+1.76                          ASOS..............4.63 TOTAL PRECIPITATION FOR THE YEAR...........4.19  DEPARTURE......+1.76                          ASOS..............4.63 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........1.8  DEPARTURE.........1.2 TOTAL SNOWFALL FOR THE MONTH...............19.3  DEPARTURE........+9.7 TOTAL SNOWFALL FOR THE SEASON..............28.6  DEPARTURE........+3.0 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/-2/T/T/.../..             40 S   AERO 40 S   RMY 42  1/09 40/25/33/+7/T/T/.../..             37 W   AERO 35 W   RMY 33 1/10 36/20/28/+3/0.00/0.0/.../..        30 W   AERO 30 W   RMY N/A 1/11 50/32/41/+16/0.00/0.0/.../..       33 S   AERO 32 S   RMY 34 1/12 60/45/53/+28/..../0.0/.../..       56 S   AERO 56 S   RMY 55 1/13 60/17/39/+14/T/0.0/.../..          58 SSW AERO 60 SSW RMY 62 1/14 21/11/16/-9/0.00/0.0/.../..        30 NW  AERO 30 NW  RMY N/A 1/15 18/11/15/-10/..../.../.../..       23 NNW AERO 21 N   RMY 23 1/16 31/18/25/0/0.00/0.0/.../..         17 SSE AERO 15 SSE RMY N/A  1/17 32/29/31/+6/0.23/2.3/.../..        20 SE  AERO 17 SE  RMY N/A   1/17 Low temp since midnight is 16F; 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 01/12/18: DAILY RECORD HIGH MINUMUM TEMPERATURE OF 45F,           PREVIOUS RECORD OF 42F WAS SET IN 2017           DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 60F,           PREVIOUS RECORD OF 59F WAS SET IN 2017 01/13/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 60F,           PREVIOUS RECORD OF 57F WAS SET IN 1890 AND   TIED IN 1932  DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):       RECORDS FOR JANUARY 18 HIGH 62F IN 1973,1990 LOW -10F IN 1982 PRECIP 1.68 INS. IN 1915 SNOWFALL 13.0 INS. IN 1948 PEAK GUST 85 MPH SSE IN 2006 RECORDS FOR JANUARY 19 HIGH 59F IN 1973 LOW -11F IN 1887 PRECIP 2.34 INS. IN 1936 SNOWFALL 10.5 INS. IN 1936 PEAK GUST 93e MPH WNW IN 1943 TODAY'S REPORT PREPARED BY: Kaitlin Ann Geagan