BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 3, 2009    
ALL TIMES ARE IN EASTERN STANDARD TIME

Today's observations:

7 A.M.   
Weather: Obscured with heavy fog
Temperature: 60F, Dew point: 60F, Wind: S at 4 kts 
Sea-level pressure: 29.84 inches Hg, rising
Visibility: 1/16 mile
6-hour minimum temp: 58F
24-hour rainfall: 0.82 inch
BHO SA 1155 W1 X 1/16F 106/60/60/1904/984/ 
8//// 53007 MANUAL 70082 ASOS 70084 10060 20058

10 A.M.   
Weather: Overcast stratus, few lower stratus, bright 
spots in overcast, thin fog
Temperature: 66F, Dew point: 64F, Wind: SSE at 5 kts 
Wind: Light and variable
Sea-level pressure: 29.85 inches Hg, rising
Visibility: 10 miles
3-hourly rainfall: 0.55 inch
BHO SA 1455 E8 OVC 10 110/66/64/1505/985/ 
FEW LWR STRA BRGHT SPTS IOVC THN FG WND LGT AND VRB/ 
8/6// 51004
 
1 P.M.   
Weather: Scattered cumulus, broken altocumulus, 
broken cirrus, moderate cumulus SE and W-NW, hazy
Temperature: 74F, Dew point: 64F, Wind: S at 7 kts
Sea-level pressure: 29.82 inches Hg, falling
Visibility: 20 miles
6-hourly max. temp. 75F
BHO SA 1755 30 SCT E120 BKN 250 BKN 20 098/74/64/1907/982/ 
MDT CU SE AND W-NW HAZY/ 8/231 58012 10075 20060


WEATHER SUMMARY FOR THURSDAY, JULY 2

TEMPERATURE (DEGREES F)
MAX.....66    NORMAL.....79
MIN.....56    NORMAL.....60
MEAN....61    NORMAL.....70

DEPARTURE FROM 30-YEAR NORMAL...........-9
TOTAL DEPARTURE FOR THE MONTH..........-19  [-9.7 DEGREES/DAY]

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............4  DEPARTURE.......+3
TOTAL HEATING UNITS FOR THE MONTH.............9  DEPARTURE.......+7
TOTAL HEATING UNITS FOR THE SEASON............9  DEPARTURE.......+7
TOTAL HEATING UNITS LAST SEASON TO DATE.......0  DIFFERENCE......+9

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............29 SSW AT  7:37 A.M.   
                   AEROVANE..............25 SSW AT  7:37 A.M.    
                   ASOS..................26 WSW AT  7:38 A.M.    
                   DAVIS.................27 SSW AT  7:36 A.M.  
FASTEST MILE FOR YESTERDAY...............18 SW  AT  7:37 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............18 WSW AT  7:38 A.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE...........20 SW  AT  7:36 A.M.     
AVERAGE WIND SPEED AND DIRECTION........9.5 NNE
                   ASOS................10.2
                   DAVIS................9.7 NNE [025 DEG]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.82  DEPARTURE....+0.69
                         ASOS..............0.84
TOTAL PRECIPITATION FOR  JULY..............1.54  DEPARTURE....+1.28
                         ASOS..............1.56  
TOTAL PRECIPITATION FOR THE YEAR..........25.18  DEPARTURE....-0.75
                         ASOS.............26.21 
 
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/.../../000/00    25 NNE   AERO 22 MPH NNE
7/2  66/56/61/-9/.../../000/00     29 SSW   AERO 25 MPH SSW

7/3  morning low temp: 58F; our normal low is now 60F

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 3
HIGH 99F IN 1911
LOW 47F IN 1914
PRECIP 1.36 IN 1985
PEAK GUST 52 MPH NW IN 1963

RECORDS FOR JULY 4
HIGH 98F IN 1911, 1919, 1949
LOW 48F IN 1914
PRECIP 1.78 IN 1950
PEAK GUST 50e MPH WNW IN 1949

TODAY'S REPORT PREPARED BY: Stephanie Radner