BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 9, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:

7 A.M.   
Weather: Overcast stratus, thin fog  
Temperature: 56F, Dew point: 52F, Wind: N at 9 kts
Wind: Direction variable NW to NE
Sea-level pressure: 30.19 inches Hg, rising  
Visibility: 12 miles, NE-E 15 miles
6-hour minimum temp: 55F
24-hour rainfall: 0.13 in.
BHO SA 1155 10 SCT E15 OVC 12 223/56/52/0109/019/ 
THN FG VSBY NE-E 15  WND 31V05/ 
8/6// 51019 MANUAL 70013 ASOS 70013 10056 20055

10 A.M.   
Weather: Broken stratocumulus
Temperature: 60F, Dew point: 50F, Wind: NE at 9G20 kts
Wind: Direction variable NNW to E
Sea-level pressure: 30.24 inches Hg, rising 
Visibility: 20 miles, light haze
BHO SA 1455 E22 BKN 25 240/60/50/0409G20/024/ 
LGT HZ WND 34V08/ 8/500 53017

1 P.M.   
Weather: Broken stratocumulus
Temperature: 63F, Dew point: 52F, Wind: NE at 8 kts,
Wind: Direction variable N to E
Sea-level pressure: 30.26 inches Hg, rising
Visibility: 30 miles, light haze
6-hourly max. temp. 63F
BHO SA 1755 E25 BKN 30 247/63/52/0508/026/ 
LGT HZ WND 35V90/ 8/500 51007 10065 20056

WEATHER SUMMARY FOR WEDNESDAY, JULY 8

TEMPERATURE (DEGREES F)
MAX.....67    NORMAL.....81
MIN.....56    NORMAL.....61
MEAN....62    NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL...........-9
TOTAL DEPARTURE FOR THE MONTH..........-48  [-6.2 DEGREES/DAY]

HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............27 NNE AT  4:22 P.M. 
                   AEROVANE..............24 NNE AT  4:22 P.M.
                   ASOS..................25 NE  AT  3:35 P.M.
                   DAVIS.................24 NNE AT  4:22 P.M.
FASTEST MILE FOR YESTERDAY...............17 NNE AT  3:33 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............17 NE  AT  3:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........17 NNE AT  3:35 P.M. 
AVERAGE WIND SPEED AND DIRECTION....... 7.8 NNE
                   ASOS.................7.3
                   DAVIS................7.5 NE [053 DEG]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.13  DEPARTURE....+0.01
                         ASOS..............0.13
TOTAL PRECIPITATION FOR  JULY..............2.47  DEPARTURE....+1.49 
                         ASOS..............2.51  
TOTAL PRECIPITATION FOR THE YEAR..........26.11  DEPARTURE....-0.54 
                         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/.../..       43 W       
7/5  78/54/66/-5/0/.../..       33 W      
7/6  79/60/70/-1/0/.../..       20 SSE
7/7  66/58/62/-9/0.73/.../..    28 SE 
7/8  67/56/62/-9/0.23/.../..    27 NNE

7/9  our morning low temp: 55F; the normal low is now 61F 

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 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992 

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

TODAY'S REPORT PREPARED BY: Stephanie Radner