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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, DECEMBER 16, 2014     
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDS MOVE IN OVERNIGHT- TEMPS REMAIN
ABOVE AVERAGE

Another clear and cool Monday featured slightly
above average temperatures, with a maximum of
41F recorded in the afternoon. Clear skies came
to an end overnight with low overcast stratus
visible at the 7:00 AM EST observation with limited
visibility of just 25 miles.

Very light drizzle began just prior to the 10:00 AM 
EST observation, bringing visibility down even 
further to only 15 miles. By the 1:00 PM EST observation
very light drizzle was still falling from low stratus.
Visibility had deteriorated further to 10 miles. Only
a trace of drizzle had fallen so far for the calendar
day with a maximum temperature of 39F.
   

Today's Observations:

7 A.M.
Weather: Overcast stratus 
Temperature: 36F; Dew Point: 32F; Wind: estimated SSW at 3 kts
Wind Speed: Light
Sea-level pressure: 30.16 ins. Hg, falling, then rising                    
Visibility: 25 miles, hazy  
6-hr max temp: 36F
6-hr min temp: 33F 
24-hr precip:  0.00
24-hr snowfall: none 
BHO SA 1155 E12 OVC 25 212/36/32/E2003/016/ HAZY WND LGT/ 8/6// 
55001 10036 20033  

10 A.M. 
Weather: Light drizzle, overcast stratus
Temperature: 38F; Dew Point: 33F; Wind: estimated E at 3 kts
Wind Speed: Light
Sea-level pressure: 30.16 ins. Hg, about the same     
Visibility: 15 miles, hazy, thin fog, obscured further by
light drizzle
3-hr precip: Trace  
BHO SA 1455 E13 OVC 15L- 213/38/33/E0803/016/ HAZY THN FG ALQDS 
PRCP VRY LGT WND LGT/ 8/6// 50001 MANUAL 6000/
 
1 P.M.
Weather: Light drizzle, overcast stratus
Temperature: 39F; Dew Point: 35F; Wind: calm,
Sea-level pressure: 30.10 ins. Hg, falling, then more slowly   
Visibility: 10 miles, thin fog in all directions, hazy,
obscured by light drizzle
6-hr max temp: 39F 
6-hr min temp: 35F
6-hr precip: Trace 
BHO SA 1755 E13 OVC 10L- 194/39/35/E0000/010/ THN FG ALQDS HAZY 
PRCP VRY LGT WND CLM/ 8/6// 56019 MANUAL 6000/ 10039 20035
 

SUMMARY FOR MONDAY, DECEMBER 15, 2014 

TEMPERATURE (DEGREES F)
MAX.....41   NORMAL.....39
MIN.....28   NORMAL.....24
MEAN....35   NORMAL.....32

DEPARTURE FROM 30-YEAR NORMAL.........................+3
TOTAL DEPARTURE FOR THE MONTH........................+16 [+0.9  DEGREES/DAY] 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............30  DEPARTURE...........-4
TOTAL HEATING UNITS FOR THE MONTH.............448  DEPARTURE..........-17     
TOTAL HEATING UNITS FOR THE SEASON...........1607  DEPARTURE.........-120
TOTAL HEATING UNITS LAST SEASON TO DATE......1729  DIFFERENCE........-122

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY..................17 NW  AT  9:49 A.M.    
                   ASOS.......................18 NW  AT  9:49 A.M.    
                   DAVIS......................17 WNW AT 12:42 A.M. RMY 17
FASTEST MILE FOR YESTERDAY....................14 NW  AT 12:08 A.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE.................15 NW  AT  9:49 A.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE................13 NW  AT 12:03 A.M.    
AVERAGE WIND SPEED AND DIRECTION............8.0 NW     
                   ASOS.....................8.3    
                   DAVIS....................6.6 NW (346 degrees)  
* Last of several occurrences...
                
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00  DEPARTURE.....-0.16 
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........5.40  DEPARTURE.....+2.94	  
                         ASOS..............5.54  
TOTAL PRECIPITATION FOR THE YEAR..........53.16  DEPARTURE.....+2.17
                         ASOS.............53.73   

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.4
TOTAL SNOWFALL FOR THE MONTH................0.6  DEPARTURE......-4.7 
TOTAL SNOWFALL FOR THE SEASON...............9.3  DEPARTURE......+1.4  

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

12/1  63/37/50/+13/0.01/0.0/391/70             28 WNW RMY 31
12/2  37/30/34/-2/0.10/T/000/00                26 E   RMY 29
12/3  49/34/42/+6/0.31/0.0/000/00              40 W   RMY 43 
12/4  41/27/34/-1/..../0.0/505/91              29 WNW RMY N/A 
12/5  42/23/33/-2/..../0.0/382/69              21 E   RMY 22
12/6  43/36/40/+5/..../0.0/000/00              25 NNW RMY N/A
12/7  36/18/27/-7/..../0.0/193/35              31 N   RMY 34
12/8  25/16/21/-13/0.01/0.1/000/00             24 N   RMY N/A
12/9  48/25/37/+3/3.23/0.0/000/00              48 ENE RMY 52
12/10 47/35/41/+8/0.43/0.0/000/00              35 NNE RMY 37 
12/11 35/29/32/-1/0.05/0.5/000/00              27 SW  RMY 27  
12/12 36/26/31/-2/0.00/0.0/230/42              23 WNW RMY 25
12/13 40/27/34/+2/0.00/0.0/191/35              28 NW  RMY 28 
12/14 43/28/36/+4/0.00/0.0/.../..              20 NW  RMY 20
12/15 41/28/35/+3/0.00/0.0/.../..              17 NW  RMY 17

12/16 morning low temp: 33F since midnight; the normal low is now 24F

* 8TH--A tenth of an inch of snow estimated

DAILY RECORDS FOR DECEMBER 2014:
	
-DAILY PRECIPITATION RECORD FOR DECEMBER 9 2014
	Old record of 1.51 inches set in 1952,
	replaced with new record of 3.23 inches.

DAILY EXTREMES 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):     

RECORDS FOR DECEMBER 16
HIGH 61 IN 1971
LOW -2 IN 1930
PRECIP 1.67 INS. IN 1960
SNOW 8.5 INS. IN 2007
WIND 73 MPH SSE IN 1982

RECORDS FOR DECEMBER 17
HIGH 63 IN 2000
LOW -10 IN 1942
PRECIP 3.03 INS. IN 1888
SNOWFALL 7.5 INS. IN 1988
PEAK GUST 78 MPH SSE IN 2000

TODAY'S REPORT PREPARED BY: Brian Fitzgerald