BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 3, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:

7 A.M.   
Weather: Thin broken cirrus
Temperature: 60F, Dew point: 52F, Wind: SW at 10 kts
Sea-level pressure: 30.21 inches Hg, rising
Visibility: 40 miles, light haze
6-hour minimum temp: 56F
24-hour precipitation: 0.00
BHO SA 1155 250 –BKN 40 229/60/52/2210/021/ LGT HZ/ 
8/006 53004 10060 20056

10 A.M. 
Weather: Thin broken cirrostratus, overcast cirrus, 
few altocululus SE-S, breaks in overcast NW-N,
partial halo
Temperature: 71F, Dew point: 59F, Wind: SSW at 6 kts
Wind: Light and variable
Sea-level pressure: 30.20 inches Hg, falling
Visibility: 35 miles, light haze
BHO SA 1455 220 –BKN E250 OVC 35 227/71/59/2106/020/ 
FEW AC SE-S BRKS IOVC NW-N PARTIAL HALO LGT HZ 
WND LGT AND VRB/ 8/031 58002 

1 P.M. 
Weather: Broken cirrostratus, broken cirrus
Temperature: 74F, Dew point: 56F, Wind: S at 6 kts
Wind: Light and variable
Sea-level pressure: 30.16 inches, falling 
Visibility: 50 miles, light haze
6-hour max. temp: 75F
BHO SA 1755 E200 BKN 250 BKN 50 212/74/56/1906/016/ 
LGT HZ WND LGT AND VRB/ 8/007 58015 10075 20060

 
WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 2

TEMPERATURE (DEGREES F)
MAX.....76    NORMAL.....75
MIN.....54    NORMAL.....57 
MEAN....65    NORMAL.....66
 
DEPARTURE FROM 30-YEAR AVERAGE...........-1
TOTAL DEPARTURE FOR THE MONTH............-7 [-3.7 DEG/DAY] 
.
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............22 S   AT  7:44 P.M.
                   AEROVANE..............18 S   AT  7:44 P.M.
                   ASOS..................20 S   AT  7:45 P.M.
                   DAVIS................ 18 S   AT  7:44 P.M.
FASTEST MILE FOR YESTERDAY...............14 SSE AT  8:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............14 SSE AT  9:05 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........12 SSW AT 12:05 A.M.    
AVERAGE WIND SPEED AND DIRECTION........7.4 SSE
                   ASOS.................7.3
                   DAVIS................6.7 SSW [204 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MONTH..............0.00   DEPARTURE....-0.26
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........34.77   DEPARTURE....+1.04
                         ASOS.............35.92 

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1  71/51/61/-6/0/.../..     17 NW 
9/2  76/54/65/-1/0/.../..     22 S

9/3  our morning low temp: 56F; the normal low is now 57F 
 
NEW DAILY RECORDS FOR SEPTEMBER 2009 TO DATE...
None.
  
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1983
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)

RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966

TODAY'S REPORT PREPARED BY: Stephanie Radner