BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, JANUARY 3, 2018   ALL TIMES ARE IN EASTERN STANDARD TIME WINDS FROM THE SOUTH BRING RELATIVELY WARM AIR TO GREAT BLUE HILL... Light winds from the south warmed Great Blue Hill today. Yesterday we had a low of -2F and a high of 15F which are about 20 degrees below seasonable. So far today temperatures are still below seasonable but have felt warmer compared to last week's Arctic blast.  By 1:00 PM we recorded a high of 28F, this is still 7 degrees below the seasonable high of 35F. Sky remained partly cloudy today with  cirrostratus clouds. A distant haze kept  visibility between 40-60 miles today.  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: 2.98 [-1.91] SNOWFALL, Inches Total: 9.4 [-4.0] 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:   N/A Campbell-Stokes card minutes: N/A Today's Observations: 7 A.M. Weather: Broken cirrostratus, few stratocumulus distant  offshore NE-ENE Temperature: 12F; Dew Point: 4F; Wind: W at 11 kts Sea-level pressure: 30.28 ins. Hg, falling then rising Visibility: 40 miles, except NNE-S 60 miles  distant fog S-NNE 6-hr Max temp: 13F 6-hr Min temp: 11F 24-hr precip: 0.00 ins. 24-hr snowfall: 0.0 ins.  Snow depth: 2 ins. BHO SA 1155 E250 BKN 40 253/12/04/2611/028/ FEW SC DSNT  OFFSHR NE-ENE VSBY NNE-S 60 DSNT FG S-NNE/ 8/506 53006 4/002  10013 20011 10 A.M. Weather: Scattered cirrostratus  Temperature: 20F; Dew Point: 10F; Wind: SW at 5 kts, Wind: Light Sea-level pressure: 30.29 ins. Hg, rising then falling Visibility: 40 miles, distant haze 3-hr precip: 0.00 ins.  BHO SA 1455 250 SCT 40 259/20/10/2305/029/ DSNT HZ ALQDS WND LGT/  8/005 53006 1 P.M. Weather: Broken cirrostratus Temperature: 28F; Dew Point: 8F; Wind: SSW at 10 kts Sea-level pressure: 30.24 ins. Hg, steady then falling Visibility: 60 miles, distant haze 6-hr Max temp: 28F 6-hr Min temp: 11F 6-hr precip: 0.00 ins. 6-hr snowfall: 0.0 ins. Snow depth: 2 ins. BHO SA 1755 E250 BKN 60 240/28/08/2010/024/ DSNT HZ ALQDS/  8/006 58019 4/002 10028 20011   SUMMARY FOR TUESDAY, JANUARY 2, 2018 TEMPERATURE (DEGREES F) MAX.....15   NORMAL.....35 MIN.....-2   NORMAL.....19 MEAN.....7   NORMAL.....27 DEPARTURE FROM 30-YEAR NORMAL..........................-20 TOTAL DEPARTURE FOR THE MONTH..........................-44 [-22.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY.............58  DEPARTURE.........+20 TOTAL HEATING UNITS FOR THE MONTH............120  DEPARTURE.........+43 TOTAL HEATING UNITS FOR THE SEASON..........2242  DEPARTURE........-139 TOTAL HEATING UNITS LAST SEASON TO DATE.....2093  DIFFERENCE.......+149 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY...................26  W AT  1:11 P.M.                    AERO........................25  W AT 11:39 A.M.                    ASOS........................26  W AT  1:11 P.M.                     DAVIS.......................26  W AT  1:10 P.M. RMY 26 FASTEST MILE FOR YESTERDAY.....................20  W AT  1:13 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................21  W AT  1:11 P.M MAXIMUM 2-MINUTE DAVIS AVERAGE.................21  W AT  1:12 P.M. AVERAGE WIND SPEED AND DIRECTION.............13.1  W                       ASOS......................13.1                     DAVIS.....................12.8  W [268 DEG.] 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..........0.00  DEPARTURE......-0.29                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR...........0.00  DEPARTURE......-0.29                          ASOS..............0.00  SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.5 TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.......-1.1 TOTAL SNOWFALL FOR THE SEASON...............9.4  DEPARTURE.......-7.7 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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/T/T/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/T/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/..../.../000/00        18 E   AERO 17 E   RMY N/A 12/23 36/24/30/+1/..../.../000/00        31 WSW AERO 28 WSW RMY 31 12/24 35/29/32/+3/..../.../191/35        30 ENE AERO 25 ENE RMY N/A 12/25 35/21/28/0/..../.../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/-15/0.00/0.0/530/97        28 WNW AERO 25 WNW RMY N/A 12/28 10/1/6/-22/0.00/0.0/..../..        37 WNW AERO 44 WNW RMY 43           12/29 13/-3/5/-22/0.00/0.0/.../..        25 W   AERO 25 W   RMY 27 12/30 14/1/8/-19/0.03/0.5/.../..         21 W   AERO 18 W   RMY 24 12/31 10/0/5/-22/0.00/0.0/.../..         32 WNW AERO 32 WNW RMY 35 PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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 1/1 11/-5/3/-24/0.00/0.0/.../..         30 NW AERO 30 NW RMY 31 1/2 15/-2/7/-20/0.00/0.0/.../..         26 W  AERO 25 W  RMY 26   1/2 Low temp since midnight is -2F; normal low is now 19F DAILY RECORDS FOR DECEMBER 2017 12/28/17: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 10F,           PREVIOUS RECORD OF 18 SET IN 1894 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):       RECORDS FOR JANUARY 3 HIGH 64F IN 2000 LOW -4F IN 1904 PRECIP 1.93 INS. IN 1999 SNOW 11.3 INS. 1996 PEAK GUST 92 MPH S IN 1960 RECORDS FOR JANUARY 4 HIGH 60F IN 2000 LOW -8F IN 1904, 1981 PRECIP 1.79 INS. IN 1982 SNOW 8.6 INS. 1923, 1941 PEAK GUST 84 MPH S IN 1982 TODAY'S REPORT PREPARED BY: Kaitlin Geagan