BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, DECEMBER 25, 2016  
ALL TIMES ARE IN EASTERN STANDARD TIME

MILD CONDITIONS AND SUNNY SKIES RETURN AFTER YESTERDAY'S RAIN

Yesterday's rain continued through the early afternoon and
totaled 0.39 in., making the month's total now 1.88 in. and
the month's deficit 1.98 in.  Winds shifted westerly in the
late afternoon and have remained out of that direction through
mid-morning today.

This morning has seen clear skies with just a few distant cumulus.
Visibility maintained 70 miles during the morning observations.
Temperatures continue to be mild, but they are not near the
record-breaking temperatures we saw last Christmas.  The record
high for December 25 of 64F was set last year, while temps. today
are expected to reach the low 40s.


7 A.M.
Weather: Few distant cumulus NE-E and WNW-NNW
Temperature: 32F; Dew Point: 29F; Wind: W at 13 kts
Sea-level pressure: 30.27 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 34F
6-hr Min temp: 32F
24-hr precip: 0.39 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 CLR 70 250/32/29/2613/027/ FEW DSNT CU NE-E AND WNW-NNW/
8/100 53011 MANUAL 70039 ASOS 70042 10034 20032

10 A.M.
Weather: Few cumulus WSW-ENE
Temperature: 39F; Dew Point: 28F; Wind: W at 11G17 kts
Sea-level pressure: 30.37 ins. Hg, rising, then more quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 285/39/28/2811G17/037/ FEW CU WSW-ENE/ 8/100 53035


SUMMARY FOR SATURDAY, DECEMBER 24, 2016
 
TEMPERATURE (DEGREES F)
MAX.....41   NORMAL.....37
MIN.....34   NORMAL.....21
MEAN....38   NORMAL.....29

DEPARTURE FROM 30-YEAR NORMAL........................+9
TOTAL DEPARTURE FOR THE MONTH.......................-14 [-0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............27   DEPARTURE..........-9
TOTAL HEATING UNITS FOR THE MONTH.............793   DEPARTURE.........+11
TOTAL HEATING UNITS FOR THE SEASON...........1823   DEPARTURE........-220
TOTAL HEATING UNITS LAST SEASON TO DATE......1479   DIFFERENCE.......+344

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................30 SSW AT 7:32 A.M.
                   ASOS........................32 SSW AT 7:14 A.M.
                   DAVIS.......................30 SSE AT 7:32 A.M. RMY 32
FASTEST MILE FOR YESTERDAY.....................24 SSW AT 7:32 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE..................24 S   AT 7:15 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................22 SSE AT 7:33 A.M.
AVERAGE WIND SPEED AND DIRECTION.............15.8 W
                   ASOS......................15.5
                   DAVIS.....................14.3 S [180 Deg.]
*Last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.39  DEPARTURE......+0.24
                         ASOS..............0.42
TOTAL PRECIPITATION FOR THE MONTH..........1.88  DEPARTURE......-1.98
                         ASOS..............2.07
TOTAL PRECIPITATION FOR THE YEAR..........38.85  DEPARTURE.....-13.54
                         ASOS.............39.50

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.5
TOTAL SNOWFALL FOR THE MONTH................6.0  DEPARTURE.......-3.7
TOTAL SNOWFALL FOR THE SEASON...............6.0  DEPARTURE.......-6.3


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

12/1  55/39/47/+10/0.20/0.0/385/69          36 W   AERO 37 W   RMY 36
12/2  48/34/41/+5/0.00/0.0/535/96           32 W   AERO 32 W   RMY N/A
13/3  44/31/38/+2/0.00/0.0/445/80           37 WNW AERO 39 WNW RMY 40
12/4  39/27/33/-2/0.00/0.0/355/64           25 NW  AERO 25 NW  RMY N/A
12/5  36/27/32/-3/0.13/0.4/000/00           26 W   AERO 25 W   RMY 29
12/6  42/30/36/+1/0.00/0.0/392/71           22 W   AERO 21 W   RMY N/A
12/7  39/34/37/+3/0.10/0.0/000/00           21 E   AERO 21 E   RMY N/A
12/8  40/29/35/+1/0.00/0.0/033/06           30 W   AERO 31 W   RMY 33
12/9  35/21/28/-6/0.00/0.0/549/100          35 W   AERO 36 WNW RMY 34
12/10 27/17/22/-11/0.00/0.0/544/99          26 WNW AERO 27 WNW RMY 29 
12/11 33/16/25/-8/0.06/0.4/411/75           17 SSW AERO 15 SW  RMY N/A
12/12 41/27/34/+1/0.35/0.9/038/07           29 ESE AERO 29 SE  RMY 30
12/13 41/30/36/+4/0.00/0.0/.../..           25 WSW AERO 25 W   RMY 27
12/14 40/26/33/+1/0.00/0.0/.../..           30 WNW AERO 31 WNW RMY N/A
12/15 29/13/21/-11/T/T/.../..               50 W   AERO 62 W   RMY 56
12/16 18/01/10/-21/0.00/0.0/.../..          39 WNW AERO 51 WNW RMY N/A
12/17 36/18/27/-4/0.60/4.3/.../..           25 SSW AERO 28 SSW RMY N/A
12/18 55/30/43/+12/0.05/0.0/.../..          47 WSW AERO 53 S   RMY 53
12/19 30/17/24/-6/0.00/0.0/.../..           26 WNW*AERO 28 NW  RMY 26
12/20 32/13/23/-7/0.00/0.0/.../..           28 SSE AERO 29 SSW RMY N/A
12/21 40/25/33/+3/0.00/0.0/.../..           28 SSE AERO 28 SSW RMY 30
12/22 38/29/34/+5/T/T/.../..                28 SSE AERO 29 S   RMY 30
12/23 44/29/37/+8/0.00/0.0/.../..           25 WNW AERO 25 WNW RMY N/A
12/24 41/34/38/+9/0.39/0.0/.../..           30 SSW AERO 31 SSW RMY 30

12/25 Low temp since midnight is 32F; normal low is now 21F

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: Cecilia Borries-Strigle