BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 5, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Skies cleared by the early afternoon following a cloudy and foggy morning. 
The temperature reached 75 degrees with dewpoints in the upper 60s. During 
the last 24 hours we've received just 0.22 in. of rain, but we expect possibly 
more with severe thunderstorms later this evening. 
 
Today's observations:
 
7 A.M.   
Weather: Heavy fog, very light drizzle
Temperature: 65F, Dew point: 65F, Wind: S at 15 kts 
Sea-level pressure: 30.19 inches Hg, falling
Visibility: 1/16 mile
6-hour min temp: 61F    
24-hour precip: 0.22 
BHO SA 1155 W2 X 1/16L-F 129/65/65/1815/991/ 8//// 58004 
ASOS 60011 MANUAL 6012/ ASOS 70020 MANUAL 70022 10065 20061
 
10 A.M. 
Weather: Low overcast, thin fog, and very light rain shower 
Temperature: 68F, Dew point: 66F, Wind: SSW at 11 kts
Sea-level pressure: 29.91 inches Hg, steady 
Visibility: 2.5 miles     
BHO SA 1455 E3 OVC 21/2RW-F 130/68/66/2011/991/ RBUKN PCPN VRY LGT/ 
8/6// 50001 MANUAL 6000/
 
1 P.M. 
Weather: Scattered stratocumulus, haze   
Temperature: 75F, Dew point: 68F, Wind: SSW at 14G20 kts
Sea-level pressure: 29.89 inches Hg, falling   
Visibility: 6 miles with haze
6-hour max temp: 75F
6-hour precip: Trace
BHO SA 1755 15 SCT 6H 123/75/68/2014G20/989/ 8/500 58007 6000/ 10075 20065 
 
WEATHER SUMMARY FOR WEDNESDAY, JULY 4
 
TEMPERATURE (DEGREES F)
MAX.....78    NORMAL.....79 
MIN.....58    NORMAL.....60
MEAN....68    NORMAL.....70
DEPARTURE FROM 30-YEAR NORMAL............. -2
TOTAL DEPARTURE FOR THE MONTH............ -25 [-6.5 per day]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............45  SSE   AT 11:41 P.M.     
                   AEROVANE.............43  SSE   AT 11:45 P.M.   
                   ASOS.................N/A  #
                   DAVIS................42  SSE   AT 11:41 P.M.        
FASTEST MILE FOR YESTERDAY..............32  SSE   AT 11:43 P.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........30  SSE   AT 11:42 P.M.          
AVERAGE WIND SPEED AND DIRECTION........15.5 S 
                   ASOS.................N/A  #
                   DAVIS................14.3 S [180 deg]  
 
# ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN 
THAT DATA WILL RESUME
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.22  DEPARTURE.....+0.10
                         ASOS..............0.20  
TOTAL PRECIPITATION FOR JULY...............0.24  DEPARTURE.....-0.26 
                         ASOS..............0.22    
TOTAL PRECIPITATION FOR THE YEAR..........27.22  DEPARTURE.....+1.05 
                   ASOS FOR YEAR..........26.63    
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
7/1  70/52/61/-9/0.02/649/71      
7/2  73/50/62/-8/0/841/92
7/3  75/53/64/-6/0/.../..
7/4  78/58/68/-2/ N/A /.../..
 
7/5  morning low temp. 61 deg; normal low 61 deg.
  
NEW DAILY RECORDS FOR JULY 2007: 
None to date
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 5
HIGH 98F IN 1911
LOW 48F IN 1920, 1927 & 1979
PRECIP 1.45 INS IN 1922
PEAK GUST 44e N IN 1944
 
RECORDS FOR JULY 6
HIGH 98F IN 1911
LOW 47F IN 1979
PRECIP 1.43 INCHES IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999

TODAY'S REPORT PREPARED By: Eli Melaas and Robert Skilling