BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, DECEMBER 25, 2018  ALL TIMES ARE IN EASTERN STANDARD TIME INCREASING WIND WITH GOOD VISIBILITY, AND A FAIR WEATHER CHRISTMAS OVERALL.... Winds from the west-northwest have increased since  yesterday, with the highest gust so far being 29 mph. Skies are mostly clear, with some scattered cumulus in the distance. The light snow that occurred yesterday left a trace on the ground, and 0.01 inches of liquid  in the gauge. Visibility improved from 70 miles at the 7 A.M. observation to 80 miles at 10 A.M. Pressure has  increased by almost 4 millibars since this morning, which has contributed to the decrease of cloud cover throughout the day. The low since midnight of 27F is 6 degrees above  the daily normal low of 21F.    Today's Observations: 7 A.M. Weather: Scattered cumulus Temperature: 27F; Dew Point: 23F; Wind: NW at 10G13 kts     Sea-level pressure: 30.14 ins. Hg, rising, then more rapidly        Visibility: 70 miles  6-hr Max temp: 30F 6-hr Min temp: 27F 24-hr Precip: 0.01 ins. 24-hr snowfall: Trace Snow depth: Trace    BHO SA 1155 50 SCT 70 208/27/23/3210G13/014/ 8/100 70001  53024 10030 20027 10 A.M. Weather: Clear, few distant cumulus   Temperature: 31F; Dew Point: 19F; Wind: NNW at 15G22 kts    Sea-level pressure: 30.20 ins. Hg, rising rapidly  Visibility: 80 miles 3-hr Precip: 0.00 ins.  BHO SA 1455 CLR 80 226/31/19/3315G22/020/ FEW DSNT CU ALQDS/  8/100 51018 SUMMARY FOR MONDAY, DECEMBER 24, 2018  TEMPERATURE (DEGREES F) MAX.....34   NORMAL.....37 MIN.....27   NORMAL.....21 MEAN....31   NORMAL.....29 DEPARTURE FROM 30-YEAR NORMAL........................+2 TOTAL DEPARTURE FOR THE MONTH.......................+23 [+0.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............34   DEPARTURE.........-2 TOTAL HEATING UNITS FOR THE MONTH.............756   DEPARTURE........-26 TOTAL HEATING UNITS FOR THE SEASON...........2076   DEPARTURE........+33 TOTAL HEATING UNITS LAST SEASON TO DATE......1751   DIFFERENCE......+325 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY....................21 W   AT  9:58 P.M.                    AERO.........................21 W   AT  7:26 P.M.                     ASOS.........................21 W   AT 11:48 P.M.                     DAVIS........................22 W   AT 11:48 P.M. RMY N/A FASTEST MILE FOR YESTERDAY......................15 W   AT  7:32 P.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...................16 W   AT  7:32 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................17 W   AT  7:32 P.M. AVERAGE WIND SPEED AND DIRECTION..............6.7 W                    ASOS.......................7.0                    DAVIS......................7.3 W [277 deg.]    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE.......-0.14                          ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........3.13  DEPARTURE.......-0.59                          ASOS..............3.77 * TOTAL PRECIPITATION FOR THE YEAR..........66.50  DEPARTURE......+14.30                          ASOS.............69.40 * * ASOS MONTHLY AND ANNUAL PRECIPITATION IS SUSPECT SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.5 TOTAL SNOWFALL FOR THE MONTH................0.1  DEPARTURE........-9.6 TOTAL SNOWFALL FOR THE SEASON...............7.7  DEPARTURE........-4.6 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 41/28/35/-2/0.00/0.0/391/70          20 NNW AERO 18 NNW RMY N/A 12/02 52/35/44/+8/1.04/0.0/000/00          28 ESE AERO 25 ESE RMY 27 12/03 54/38/46/+10/0.00/0.0/178/32         35 W   AERO 35 W   RMY 38  12/04 38/23/31/-4/0.00/0.0/516/93          30 WNW AERO 31 WNW RMY 33 12/05 33/18/26/-9/0.00/0.0/432/78          16 NNW AERO 15 NNW RMY N/A 12/06 37/24/31/-4/0.00/0.0/354/64          29 W   AERO 28 W   RMY 30 12/07 37/21/29/-5/0.00/0.0/546/99          29 NW  AERO 29 NW  RMY 32 12/08 27/15/21/-13/0.00/0.0/518/94         28 NW  AERO 27 NW  RMY 29 12/09 34/17/26/-8/0.00/0.0/391/71          23 SSW AERO 21 SSW RMY 22 12/10 36/22/29/-4/0.00/0.0/544/99          24 NNW AERO 23 NNW RMY 22 12/11 36/17/27/-6/0.00/0.0/543/99          16 WSW AERO 14 WSW RMY N/A 12/12 35/18/27/-6/0.00/0.0/471/86          30 NW  AERO 29 NW  RMY M 12/13 31/16/24/-8/0.00/0.0/088/16          16 NNE AERO 12 SE  RMY N/A 12/14 46/28/37/+5/0.00/0.0/399/73          28 SSW AERO 28 SSW RMY 29 12/15 49/33/43/+11/0.04/0.0/000/00         28 NE  AERO 27 NE  RMY 30 12/16 40/37/39/+8/..../0.0/.../..          38 NE  AERO 38 NE  RMY 40 12/17 37/32/35/+4/..../0.0/.../..          39 NNE AERO 37 NNE RMY N/A 12/18 34/20/27/-4/0.02/0.1/.../..          48 NW  AERO 55 NW  RMY 48 12/19 38/17/28/-2/0.00/0.0/.../..          23 WNW AERO 23 WNW RMY N/A 12/20 47/30/39/+9/0.00/0.0/.../..          23 SW  AERO 22 SW  RMY N/A 12/21 62/43/53/+23/..../0.0/.../..         60 SSE AERO 62 SSE RMY 63 12/22 54/31/43/+14/..../0.0/.../..         41 W   AERO 45 W   RMY 43 12/23 38/27/33/+4/0.00/0.0/.../..          30 WNW AERO 32 WNW RMY N/A 12/24 34/27/31/+2/0.01/T/.../..            21 W   AERO 21 W   RMY N/A 12/25 Low temp since midnight is 27F; normal low is 21F DAILY RECORDS FOR DECEMBER 2018 12/21/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 62F,           BREAKS PREVIOUS RECORD OF 60F SET IN 1957 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR DECEMBER 25 HIGH 64 IN 2015 LOW -11 IN 1980 PRECIP 1.37 INS. IN 2002 SNOWFALL 8.5 INS. IN 2002 PEAK GUST 80 MPH NW IN 1971 RECORDS FOR DECEMBER 26 HIGH 58 IN 1973,1982 LOW -12 IN 1980 PRECIP 3.64 INS. IN 1969 SNOWFALL 17.5 INS. IN 1909 PEAK GUST 84 MPH SSE IN 1957 TODAY'S REPORT PREPARED BY: Benjamin Turner