BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JANUARY 12, 2007  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Overcast altocumulus
Temperature: 38F, Dew point: 26F, Wind: SSW at 20G33 kts
Wind: Peak gust 33 kts S last hour
Sea-level pressure: 30.33 inches Hg, falling
Visibility: 25 miles
6-hourly min. temp. 33 deg. 
BHO SA 1155 E90 BKN 120 OVC 25 271/38/26/2020G33/033/ 
PK WND 1933/49 8/07/ 56012 10038 20033
 
10 A.M.    
Weather: Overcast altocumulus
Temperature: 42F, Dew point: 27F, Wind: SSW at 22G30 kts
Wind: Peak gust 30 kts SSW last hour
Sea-level pressure: 30.31 inches Hg, falling  
Visibility: 35 miles  
BHO SA 1455 E110 BKN 150 OVC 35 265/42/27/2022G30/031/ 
FEW ACSL NE-ESE AND W BINOVC S HAZY PK WND 2030/53/ 8/07/ 55006
  
1 P.M.    
Weather: Overcast altocumulus
Temperature: 44F, Dew point: 28F, Wind: SW at 12G24 kts
Wind: Peak gust 28 kts SW last hour
Sea-level pressure: 30.24 inches Hg, falling   
Visibility: 30 miles  
6-hourly max. temp: 44 deg. 
BHO SA 1755 E90 OVC 30 241/44/28/2312G24/024/ FEW SC SSE-SW 
BINOVC S-SW AND NW-N HAZY PK WND 2228/08/ 8/53/ 56024 10044 20038
 
WEATHER SUMMARY FOR THURSDAY, JANUARY 11 
 
TEMPERATURE (DEGREES F)
MAX.....33   NORMAL.....34 
MIN.....17   NORMAL.....18   
MEAN....25   NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL.........-1 
TOTAL DEPARTURE FOR THE MONTH.......+162 (+14.5 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........40   DEPARTURE.......+1
TOTAL HEATING UNITS FOR THE MONTH.........262   DEPARTURE.....-161 
TOTAL HEATING UNITS FOR THE SEASON.......2135   DEPARTURE.....-617
TOTAL HEATING UNITS LAST SEASON TO DATE..2513   DIFFERENCE....-378
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...........36   S AT 10:02 P.M.                
                   AEROVANE............38   S AT 10:01 P.M.                        
                   ASOS................35 SSW AT 10:18 P.M.                      
                   DAVIS...............40 SSW AT 10:17 P.M.                 
FASTEST MILE FOR YESTERDAY.............29 SSW AT 10:42 P.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE..........29   S AT 10:02 P.M.           
MAXIMUM 2-MINUTE DAVIS AVERAGE.........32   S AT 10:50 P.M.                
AVERAGE WIND SPEED AND DIRECTION.....13.6   W 
                   ASOS..............14.3          
                   DAVIS.............13.6  SW [224 deg] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.77  DEPARTURE......+0.12 
                         ASOS..............1.78    
TOTAL PRECIPITATION FOR THE YEAR...........1.77  DEPARTURE......+0.12
                         ASOS..............1.78
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0   DEPARTURE.....-0.5
TOTAL SNOWFALL FOR THE MONTH................0.0   DEPARTURE.....-5.5
TOTAL SNOWFALL FOR THE SEASON...............3.7   DEPARTURE....-15.4
 
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
1/1  53/30/42/+15/0.98/0/000/00     38 SE 
1/2  43/31/37/+10/0.03/0/505/92     44 W    Aero 47 MPH W   
1/3  49/30/40/+13/0/0/435/79        40 S   
1/4  53/40/47/+20/0/0/198/36*       31 SSW
1/5  61/46/54/+27/0.04/0/000/00     44 S    Aero 44 MPH S
1/6  66/48/57/+31/0.03/0/161/29     48 SSW  Aero 47 MPH SSW 
1/7  50/38/44/+18/0/0/505/91        43 W    Aero 44 MPH W 
1/8  52/36/44/+18/0.69/0/000/00     45 W    Aero 45 MPH W 
1/9  41/29/35/+9/0/0/518/93         40 W    Aero 39 MPH W
1/10 34/22/28/+2/0/0/525/94         48 W
1/11 33/17/25/-1/0/0/.../..         36 S    Aero 38 MPH S
 
1/12 morning low temp. 33 deg; normal low now 18 deg. 
      
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 12
HIGH 57F IN 1913, 1975
LOW -15F IN 1886
PRECIP 1.46 INS. IN 1900
SNOW 6.0 INS. IN 1923
WIND 84e MPH S IN 1980
 
RECORDS FOR JANUARY 13
HIGH 57F IN 1890,1932
LOW -10F IN 1912,1914
PRECIP 1.54 INS. IN 1979
SNOWFALL 12.6 INS. IN 1964
PEAK GUST 74 MPH NE IN 1964
 
TODAY'S REPORT By: Stephanie Radner