BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 18, 2007
ALL TIMES ARE IN EASTERN STANDARD TIME
 
HIGHEST PRESSURE OBSERVED SINCE 1999...
The sea level pressure at 9:44 P.M. on January 17 was
30.77 inches Hg.  This is the highest pressure that has
occurred since 30.84 inches Hg. in January 1999.
 
Today's observations:
 
7 A.M.   
Weather: Scattered clouds
Temperature: 13F, Dew point: 3F, Wind: S at 09 kt 
Sea-level pressure: 30.71 inches Hg, rising
Visibility: 60 miles
BHO SA 1155 140 SCT 160 SCT 60 401/13/3/1709/071/ 
FEW SC NE-SE AND S-SSW/ 8/570 53001 10013 20011
 
10 A.M.    
Weather: Overcast  
Temperature: 22F, Dew point: 6F, Wind: SSE at 14 kt 
Sea-level pressure: 30.68 inches Hg, falling   
Visibility: 40 miles  
BHO SA 1455 160 SCT E200 OVC 40 388/22/6/1614/068/ 
PTCHS DENSE CI THN SPTS IOVC/ 8/072 56013
 
1 P.M.    
Weather: Overcast
Temperature: 31F, Dew point: 17F, Wind: S at 14 kt 
Sea-level pressure: 30.54 inches Hg, falling 
Visibility: 40 miles
BHO SA 1755 E200 BKN 250 OVC 40 343/31/17/1714/054/ 
FEW SC ALQDS FEW ACSL W-NW THN SPTS IOVC/ 8/542 56045 
10031 20013
 
WEATHER SUMMARY FOR WEDNESDAY, JANUARY 17  
 
TEMPERATURE (DEGREES F)
MAX.....18   NORMAL.....33 
MIN......7   NORMAL.....18   
MEAN....13   NORMAL.....26
 
DEPARTURE FROM 30-YEAR NORMAL........-13 
TOTAL DEPARTURE FOR THE MONTH.......+199 (+11.5 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........52   DEPARTURE......+13
TOTAL HEATING UNITS FOR THE MONTH.........459   DEPARTURE.....-198 
TOTAL HEATING UNITS FOR THE SEASON.......2332   DEPARTURE.....-644
TOTAL HEATING UNITS LAST SEASON TO DATE..2692   DIFFERENCE....-360
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............38 WNW AT 12:50 A.M. *                  
                   AEROVANE.............43 WNW AT 12:31 A.M.                         
                   ASOS.................40 WNW AT 12:31 A.M.                      
                   DAVIS.............. .40 WNW AT 12:30 A.M.                 
FASTEST MILE FOR YESTERDAY..............29 WNW AT 01:00 A.M. *      
MAXIMUM 2-MINUTE ASOS AVERAGE...........30 W   AT 12:32 A.M.            
MAXIMUM 2-MINUTE DAVIS AVERAGE..........31 W   AT 12:31 A.M.                 
AVERAGE WIND SPEED AND DIRECTION......13.7 WNW 
                    ASOS..............13.1    
                    DAVIS.............14.2 WNW [294 deg.] 
* 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..........2.62  DEPARTURE.......0.00 
                         ASOS..............2.57    
TOTAL PRECIPITATION FOR THE YEAR...........2.62  DEPARTURE.......0.00
                         ASOS..............2.57 
 
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.....-8.5
TOTAL SNOWFALL FOR THE SEASON...............3.7   DEPARTURE....-18.4
 
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 48/32/40/+14/0/0/.../..        38 SSW  Aero 39 MPH SSW
1/13 48/36/42/+16/0.06/000/00       30 S     
1/14 38/31/35/+9/../0/000/00        21 NE
1/15 40/31/36/+10/../0/000/00       25 NNE
1/16 38/15/27/+1/../0/.../..        40 W    Aero 42 MPH W
1/17 18/7/13/-13/../0/.../..        38 WNW  Aero 43 MPH WNW
 
1/18 morning low temp. 11 deg; normal now 18 deg.
      
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JANUARY 18
HIGH 62F IN 1973,1990
LOW -10F IN 1982
PRECIP 1.68 INCHES IN 1915
SNOWFALL 13.0 INCHES IN 1948
PEAK GUST 85 MPH SSE IN 2006
 
RECORDS FOR JANUARY 19
HIGH 59F IN 1973
LOW -11F IN 1887
PRECIP 2.34 INS. IN 1936
SNOWFALL 10.5 INS. IN 1936
PEAK GUST 93e MPH WNW IN 1943
 
TODAY'S REPORT By: Stephanie Radner