BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 10, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:

7 A.M.   
Weather: Clear, hazy
Temperature: 61F, Dew point: 54F, Wind: NW at 5 kts
Sea-level pressure: 30.33 inches Hg, rising  
Visibility: 15 miles, hazy
6-hour minimum temp: 54F
BHO SA 1155 CLR 15 271/61/54/3205/033/ HAZY/ 51008 10061 20054

10 A.M.   
Weather: Clear, few cumulus
Temperature: 70F, Dew point: 48F, Wind: NE at 5 kts
Wind: Light and variable
Sea-level pressure: 30.34 inches Hg, rising 
Visibility: 30 miles, hazy
BHO SA 1455 CLR 30 273/70/48/0505/034/ 
FEW CU N AND S-W HAZY WND LGT AND VRB/ 8/100 51002

1 P.M.   
Weather: Clear, few cumulus
Temperature: 74F, Dew point: 49F, Wind: SSE at 5 kts,
Wind: Light and variable 
Sea-level pressure: 30.30 inches Hg, falling
Visibility: 40 miles, hazy
6-hourly max. temp. 76F
BHO SA 1755 CLR 40 262/74/49/1505/030/ 
FEW CU HAZY WND LGT AND VRB/ 8/100 56011 10076 20061

WEATHER SUMMARY FOR THURSDAY, JULY 9

TEMPERATURE (DEGREES F)
MAX.....66    NORMAL.....81
MIN.....55    NORMAL.....61
MEAN....61    NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL..........-10
TOTAL DEPARTURE FOR THE MONTH..........-58  [-6.6 DEGREES/DAY]

HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 NE  AT  9:53 A.M. *
                   AEROVANE..............20 NE  AT  9:27 A.M.
                   ASOS..................21 NE  AT 10:56 A.M.
                   DAVIS.................22 NE  AT 10:12 A.M.
FASTEST MILE FOR YESTERDAY...............14 NE  AT  9:24 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............15 NE  AT 10:56 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........15 NE  AT  9:27 A.M. 
AVERAGE WIND SPEED AND DIRECTION....... 8.0 NNE
                   ASOS.................8.1
                   DAVIS................8.2 NNE [027 DEG]
* last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE....-0.12
                         ASOS..............0.00
TOTAL PRECIPITATION FOR  JULY..............2.47  DEPARTURE....+1.37
                         ASOS..............2.51  
TOTAL PRECIPITATION FOR THE YEAR..........26.11  DEPARTURE....-0.66
                         ASOS.............27.16 

PRELIMINARY CLIMATE SUMMARY FOR JULY 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

7/1  62/57/60/-10/0.51/000/00   25 NNE   TSTM
7/2  66/56/61/-9/1.00/000/00    29 SSW   AERO 25 MPH SSW TSTM
7/3  75/58/67/-3/T/283/31       23 WSW
7/4  77/59/68/-2/0/838/92       43 W       
7/5  78/54/66/-5/0/856/94       33 W      
7/6  79/60/70/-1/0/883/97       20 SSE
7/7  66/58/62/-9/0.73/027/03    28 SE    TSTM
7/8  67/56/62/-9/0.23/.../..    27 NNE   TSTM
7/9  66/55/61/-10/0/.../..      23 NE

7/10 our morning low temp: 54F; the normal low is now 62F 

NEW DAILY RECORDS FOR JULY 2009 TO DATE...
NONE 
  
DAILY EXTREMES

Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.68 INS IN 1933
WIND 75 MPH W IN 1985

RECORDS FOR JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988

TODAY'S REPORT PREPARED BY: Stephanie Radner