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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, DECEMBER 22, 2014     
ALL TIMES ARE IN EASTERN STANDARD TIME

FLURRIES BRING ANOTHER TRACE OF SNOW SUNDAY-DAY, 
2 INCHES OF SNOW ON THE GROUND THIS MORNING

Flurries which continued throughout most of Sunday brought
another trace of snow on top of the 1.7 inches that fell 
Saturday into Sunday. Temperatures on Sunday kept steady
between 31F an 29F for a 24-hour maximum and minimum
respectively. 

By 9:00 AM EST this morning, temperatures climbed above
the freezing mark, thanks in part to blue skies overhead.
By the 1:00 PM EST observation, light rain, beginning at
12:17 PM EST, ended at 12:52 PM EST, leaving a trace of
precipitation. Rain showers were visible and distant in all
directions, reducing visibility to at most 10 miles. A
maximum of 40F had been recorded so far for Monday.


Today's Observations:

7 A.M.
Weather: Broken stratus, overcast stratocumulus,
showers distant E
Temperature: 30F; Dew Point: 28F; Wind: N at 8 kts
Sea-level pressure: 30.38 ins. Hg, rising                     
Visibility: 25 miles, except 15 miles E, obscured by 
distant showers and thin fog
Snow depth: 2 ins.
6-hr max temp: 30F
6-hr min temp: 29F 
24-hr precip:  Trace 
24-hr snowfall: Trace  
BHO SA 1155 E21 BKN 45 OVC 25 289/30/28/3608/038/ SHWRS DSNT E 
VSBY E 15 MI THN FG ALQDS NEW SNW PST 24 HRS TRACE/ 8/6// 4/002 
53010 10030 20029 

10 A.M. 
Weather: Broken cumulus, broken stratocumulus, broken cirrus
Temperature: 35F; Dew Point: 33F; Wind: NE at 7 kts,
Sea-level pressure: 30.40 ins. Hg, rising then rising more quickly
Visibility: 20 miles, obscured by thin fog
BHO SA 1455 E5 BKN 50 BKN 250 BKN 20 294/35/33/0407/040/ 
THN FG ALQDS/ 8/801 53005

1 P.M.
Weather: Broken stratus fractus, thin overcast of 
stratocumulus, few cumulus fractus in all direction,
showers distant in all directions, light rain beginning
12:17, ending 12:52 PM EST
Temperature: 40F; Dew Point: 38F; Wind: estimated NNE at 4 kts
Wind Speed: Light
Sea-level pressure: 30.36 ins. Hg, falling then rising, but lower  
Visibility: 10 miles, except 8 miles SW, 5 miles N, obscured
by showers in all directions
6-hr max temp: 40F 
6-hr min temp: 30F
6-hr precip: Trace
6-hr snowfall: 0.0 
BHO SA 1755 E31 BKN 39 -OVC 10 282/40/38/E0204/036/ 
R-B17E52 VSBY SW 8 MI VSBY N 5 MI SHWRS DSNT ALQDS 
FEW CUFRA ALQDS WND LGT/ 8/7// MANUAL 6000/ 55012 10040 20030
 

SUMMARY FOR SUNDAY, DECEMBER 21, 2014 

TEMPERATURE (DEGREES F)
MAX.....31   NORMAL.....37
MIN.....29   NORMAL.....22
MEAN....30   NORMAL.....30

DEPARTURE FROM 30-YEAR NORMAL.........................+0
TOTAL DEPARTURE FOR THE MONTH........................+37 [+1.7 DEGREES/DAY] 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............35  DEPARTURE...........+0
TOTAL HEATING UNITS FOR THE MONTH.............634  DEPARTURE..........-40     
TOTAL HEATING UNITS FOR THE SEASON...........1793  DEPARTURE.........-142
TOTAL HEATING UNITS LAST SEASON TO DATE......1934  DIFFERENCE........-141

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY..................20  NNE  AT  8:07 A.M.     
                   ASOS.......................23  NNE  AT  8:08 A.M.     
                   DAVIS......................21  NNE  AT  8:07 A.M. RMY 22
FASTEST MILE FOR YESTERDAY....................14  NNE  AT  8:11 A.M.       
MAXIMUM 2-MINUTE ASOS AVERAGE.................15  NNE  AT  8:15 A.M.      
MAXIMUM 2-MINUTE DAVIS AVERAGE................15  NNE  AT  8:09 A.M.      
AVERAGE WIND SPEED AND DIRECTION..............7.4 N      
                   ASOS.......................8.3    
                   DAVIS......................7.1 N [011 degrees]  
                
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE  DEPARTURE.....-0.15 
                         ASOS.............TRACE
TOTAL PRECIPITATION FOR THE MONTH..........6.04  DEPARTURE.....+2.65
                         ASOS..............6.21  
TOTAL PRECIPITATION FOR THE YEAR..........53.80  DEPARTURE.....+1.88
                         ASOS.............54.40   

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE  DEPARTURE......-0.4
TOTAL SNOWFALL FOR THE MONTH................2.3  DEPARTURE......-5.9 
TOTAL SNOWFALL FOR THE SEASON..............11.0  DEPARTURE......+0.2  

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/-1/0.00/0.0/505/91              29 WNW RMY N/A 
12/5  42/23/33/-2/0.12/0.0/382/69              21 E   RMY 22
12/6  43/36/40/+5/0.99/0.0/000/00              25 NNW RMY N/A
12/7  36/18/27/-7/0.15/0.0/193/35              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/+4/0.00/0.0/377/69              20 NW  RMY 20
12/15 41/28/35/+3/0.00/0.0/536/98              17 NW  RMY 17
12/16 42/33/38/+7/T/T/011/02                   17 E   RMY N/A
12/17 45/37/41/+10/0.43/0.0/000/00             27 W   RMY N/A 
12/18 41/32/37/+6/0.02/T/213/39                35 WNW RMY 38   
12/19 34/25/30/0/0.00/0.0/000/00               26 NW  RMY 29
12/20 32/24/28/-2/..../.../.../..              21 NNE RMY 23 
12/21 31/29/30/+0/..../.../000/00              20 NNE RMY 22

12/22 morning low temp: 29F since midnight; normal low is now 22F

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 22
HIGH 62 IN 1994
LOW -5 IN 1921
PRECIP 1.52 INS. IN 1975
SNOWFALL 8.8 INS. IN 1975
PEAK GUST 62 MPH WNW IN 1998

RECORDS FOR DECEMBER 23
HIGH 62 IN 1990
LOW -1 IN 1989
PRECIP 1.70 INS. IN 1947
SNOWFALL 11.9 INS. IN 1947
PEAK GUST 67 SSE IN 2004

TODAY'S REPORT PREPARED BY: Brian Fitzgerald