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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, DECEMBER 13, 2014     
ALL TIMES ARE IN EASTERN STANDARD TIME

PARTIAL SUNSHINE AND SEASONABLE CONDITIONS CONTINUE
ON GREAT BLUE HILL, TRACE OF SNOW OVERNIGHT

Our first sunshine arriving yesterday since Sunday the 7th
was a welcome sight, along with this morning's late 
sunrise, only partially blocked by mostly cloudy
conditions. A trace of snow was recorded overnight
along with a low of 27F- just 2 degrees above our
daily average minimum of 25F.

By the 1:00 PM EST observation snow showers were visible
for several hours to the N-E with reports of nearly 1 inch
in some locations around Cape Ann. No precipitation
had been measured since 7:00 AM EST this morning, and 
skies were partly sunny with visibility of 70 miles, 
except 40 miles NNE-ESE. A maximum of 40F had been
reached by the observation as well.


Today's Observations:

7 A.M.
Weather: Broken stratocumulus, few cumulus/stratocumulus
distant WSW-SSE 
Temperature: 28F; Dew Point: 25F; Wind: NW at 10 kts
Sea-level pressure: 29.85 ins. Hg, falling, then more slowly                   
Visibility: 40 miles, except 70 miles S-SW 
6-hr max temp: 29F
6-hr min temp: 27F 
24-hr precip:  trace 
24-hr snowfall: trace 
BHO SA 1155 E38 BKN 40 109/28/25/3110/985/ VSBY S-SW 70 MI 
FEW CU/SC DSNT WSW-SSE NEW SNW PST 24 HRS TRACE/ 
8/800 56002 10029 20027

10 A.M. 
Weather: Broken altocumulus, few cumulus distant WSW-SE,
showers distant N-NE
Temperature: 32F; Dew Point: 26F; Wind: NW at 11G19 kts
Sea-level pressure: 29.87 ins. Hg, rising then more slowly     
Visibility: 40 miles, except 80 miles SSE-WSW 
BHO SA 1455 E60 BKN 40 116/32/26/3113G19/987/ 
VSBY SSE-WSW 80 MI SHWRS DSNT N-NE FEW CU DSNT WSW-SE/ 8/150 51007 

1 P.M.
Weather: Scattered altocumulus lenticularis,
scattered alto/nimbostratus, bands of cirrus,
showers distant NNE-ESE
Temperature: 39F; Dew Point: 27F; Wind: WNW at 11G15 kts,
Sea-level pressure: 29.80 ins. Hg, falling then more quickly  
Visibility: 70 miles, mountains in cloud 60 NW, 40 miles
NNE-ESE 
6-hr max temp: 39F
6-hr min temp: 27F 
BHO SA 1755 25 SCT 38 SCT E250 BKN 70 093/39/27/2911G15/980/ 
SHWRS DSNT NNE-ESE VSBY NNE-ESE 40 MI ACSL ALQDS/ 
8/042 58023 10040 20028 

 
SUMMARY FOR FRIDAY, DECEMBER 12, 2014 

TEMPERATURE (DEGREES F)
MAX.....36   NORMAL.....41
MIN.....26   NORMAL.....26
MEAN....31   NORMAL.....33

DEPARTURE FROM 30-YEAR NORMAL.........................-2
TOTAL DEPARTURE FOR THE MONTH.........................+7 [+0.4  DEGREES/DAY] 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............34  DEPARTURE...........+1
TOTAL HEATING UNITS FOR THE MONTH.............358  DEPARTURE...........-8     
TOTAL HEATING UNITS FOR THE SEASON...........1517  DEPARTURE.........-110
TOTAL HEATING UNITS LAST SEASON TO DATE......1603  DIFFERENCE.........-86

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY..................23 WNW AT 10:33 A.M.    
                   ASOS.......................24 NW  AT 10:33 A.M.   
                   DAVIS......................23 WNW AT 10:33 A.M. RMY 25
FASTEST MILE FOR YESTERDAY....................17 NW  AT 10:31 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE.................18 NW  AT 10:34 A.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE................17 NW  AT 10:34 A.M.   
AVERAGE WIND SPEED AND DIRECTION.............9.5 WNW    
                   ASOS......................9.4    
                   DAVIS.....................8.2 W (282 degrees)  
* Last of several occurrences...
                
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE  DEPARTURE.....-0.17 
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........5.40  DEPARTURE.....+3.42	  
                         ASOS..............5.54  
TOTAL PRECIPITATION FOR THE YEAR..........53.16  DEPARTURE.....+2.65
                         ASOS.............53.73   

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE  DEPARTURE......-0.4
TOTAL SNOWFALL FOR THE MONTH................0.6  DEPARTURE......-2.6 
TOTAL SNOWFALL FOR THE SEASON...............9.3  DEPARTURE......+2.7  

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/.../..             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/.../..              29 WNW RMY N/A 
12/5  42/23/33/-2/..../0.0/.../..              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/..../0.0/000/00              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/..../0.0/000/00              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/..../.../.../..              23 WNW RMY 25

12/13 morning low temp: 27F since midnight; the normal low is now 25F

* 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 13
HIGH 60 IN 1984
LOW 0 IN 1893
PRECIP 1.45 INS. IN 1983
SNOWFALL 9.2 INS. IN 2007
PEAK GUST 81e WNW IN 1976

RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941

TODAY'S REPORT PREPARED BY: Brian Fitzgerald