BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, DECEMBER 27, 2018  ALL TIMES ARE IN EASTERN STANDARD TIME SECOND CONSECUTIVE BLUE BIRD DAY ATOP GREAT BLUE HILL.... Today's observation period continued our streak of near seasonal  temperatures, with clear skies overhead and visibility continuing  to sustain around 70 and 80 miles.  High pressure continued to dominate the  atmosphere, with relatively little cloud activity observed throughout the day.   Pressure readings peaked around 10 A.M. and are decreasing at the time of the 1 P.M. observation.  Trends for the past two days are in accordance with what  is expected on cloudless days, exhibiting a daily oscillation that brings high pressure in the late morning hours, and low pressure in the afternoon. Winds have stayed light for most the day, with directions shifting to  increasingly northerly flow.  This cold air advection has kept temperatures cool and seasonal in spite of the sunny skies persisting throughout the day. Today's Observations: 7 A.M. Weather: Few cirrocumulus, few distant stratocumulus S-NE Temperature: 26F; Dew Point: 22F; Wind: NW at 9G15 kts     Sea-level pressure: 30.58 ins. Hg, rising steadily        Visibility: 70 miles  6-hr Max temp: 31F 6-hr Min temp: 26F 24-hr Precip: 0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins.  BHO SA 1155 CLR 70 355/26/22/3109G15/058/  FEW DSNT SC S-NE FEW CC/ 8/409 52039 10031 20026 10 A.M. Weather: Few cirrus, few distant cumulus SE-NE   Temperature: 29F; Dew Point: 17F; Wind: NNW at 13G21 kts    Sea-level pressure: 30.62 ins. Hg, rising, then more slowly  Visibility: 80 miles 3-hr Precip: 0.00 ins.  BHO SA 1455 CLR 80 369/29/17/3311G18/062/  FEW CI FEW DSNT CU SE-NE/ 8/101 51014 1 P.M. Weather: Few cirrus, few cirrostratus SW-W, few stratocumulus SE-NE Temperature: 33F; Dew Point: 5F; Wind: NW at 5 kts     Sea-level pressure: 30.60 ins. Hg, falling, then more slowly       Visibility: 80 miles  6-hr Max temp: 33F 6-hr Min temp: 26F 6-hr Precip: 0.00 ins. 6-hr snowfall: 0.0 ins.   Snow depth: 0 ins. BHO SA 1755 CLR 80 363/33/05/3305/060/  FEW CI FEW DSNT SC SE-NE FEW CS SW-W/ 8/409 55006 10033 20026 SUMMARY FOR WEDNESDAY, DECEMBER 26, 2018  TEMPERATURE (DEGREES F) MAX.....36   NORMAL.....36 MIN.....20   NORMAL.....20 MEAN....28   NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL.........................0 TOTAL DEPARTURE FOR THE MONTH.......................+24 [+0.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............37   DEPARTURE..........0 TOTAL HEATING UNITS FOR THE MONTH.............829   DEPARTURE........-26 TOTAL HEATING UNITS FOR THE SEASON...........2149   DEPARTURE........+32 TOTAL HEATING UNITS LAST SEASON TO DATE......1834   DIFFERENCE......+315 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY....................24 NW  AT  3:02 P.M.                    AERO.........................24 NW  AT 12:18 P.M., 3:02 P.M.                     ASOS.........................25 NW  AT  3:07 P.M.                     DAVIS........................24 WNW AT 12:23 P.M. RMY 25 FASTEST MILE FOR YESTERDAY......................17 NW  AT  1:19 P.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...................17 NW  AT  3:19 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 NW  AT  3:07 P.M. AVERAGE WIND SPEED AND DIRECTION.............10.8 NW                    ASOS......................11.1                    DAVIS.....................11.3 WNW [300 deg.]    PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.......-0.14                          ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........3.13  DEPARTURE.......-1.05                          ASOS..............3.78 * TOTAL PRECIPITATION FOR THE YEAR..........66.50  DEPARTURE......+13.98                          ASOS.............69.41 * * 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.......-10.6 TOTAL SNOWFALL FOR THE SEASON...............7.7  DEPARTURE........-5.6 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 35/23/29/+1/0.00/0.0/.../..          28 NW  AERO 28 NW  RMY 29 12/26 36/20/28/0/0.00/0.0/.../..           24 NW  AERO 24 NW  RMY 25 12/27 Low temp since midnight is 26F; normal low is 20F 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 27 HIGH 57 IN 1895,1949 LOW -4 IN 1903 PRECIP 2.43 INS. IN 1969 SNOWFALL 11.2 INS. IN 1947 PEAK GUST 73 S IN 2011 RECORDS FOR DECEMBER 28 HIGH 60 IN 1982 LOW -2 IN 1933 PRECIP 2.16 INS. IN 1967 SNOWFALL 9.5 INS. IN 1967 PEAK GUST 89 MPH SSE IN 1983 TODAY'S REPORT PREPARED BY: Nate Iannuccillo