BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 11, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:

7 A.M.   
Weather: Thin scattered cirrus, few lower dense cirrus,
few cumulus distant W-WNW, hazy
Temperature: 61F, Dew point: 50F, Wind: SSW at 10 kts
Sea-level pressure: 30.24 inches Hg, steady  
Visibility: 45 miles, hazy
6-hour minimum temp: 56F
BHO SA 1155 250 –SCT 45 238/61/50/2110/024/ FEW LWR DNS CI 
FEW CU DSNT W-WNW HAZY/ 8/101 50000 10061 20056

10 A.M.   
Weather: Thin broken cirrus, few cumulus distant NNW, hazy
Temperature: 72F, Dew point: 55F, Wind: S at 9 kts
Sea-level pressure: 30.19 inches Hg, falling 
Visibility: 40 miles, hazy
BHO SA 1455 250 –BKN 40 225/72/55/1809/019/ FEW CU DSNT NNW 
HAZY/ 8/101 58013

1 P.M.   
Weather: Thin scattered cirrus, few lower dense cirrus,
few cumulus SW-NNE, hazy
Temperature: 76F, Dew point: 53F, Wind: S at 12G21 kts
Wind: Direction variable SSE-SW
Sea-level pressure: 30.11 inches Hg, falling
Visibility: 40 miles, hazy
6-hourly max. temp. 77F
BHO SA 1755 250 –SCT 40 198/76/53/1912G21/011/ FEW LWR DNS CI 
FEW CU SW-NNE HAZY WND 16V22/ 8/101 58027 10077 20061


WEATHER SUMMARY FOR FRIDAY, JULY 10

TEMPERATURE (DEGREES F)
MAX.....76    NORMAL.....81
MIN.....54    NORMAL.....62
MEAN....65    NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL...........-6
TOTAL DEPARTURE FOR THE MONTH..........-64  [-6.6 DEGREES/DAY]

HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............21  SW AT 11:57 P.M.
                   AEROVANE..............17  SW AT 11:57 P.M.
                   ASOS..................18 WSW AT 11:58 P.M.
                   DAVIS.................18  SW AT N/A
FASTEST MILE FOR YESTERDAY...............14  SW AT 11:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............14 WSW AT 11:59 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........N/A 
AVERAGE WIND SPEED AND DIRECTION........7.3 E
                   ASOS.................6.4
                   DAVIS................5.9 ESE [110 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 THE MONTH..........2.47  DEPARTURE....+1.25
                         ASOS..............2.51  
TOTAL PRECIPITATION FOR THE YEAR..........26.11  DEPARTURE....-0.78
                         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 76/54/65/-6/0/.../..       21 SW

7/11 morning low temp: 56F; 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 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988

RECORDS FOR JULY 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

TODAY'S REPORT PREPARED BY: Mike Iacono