BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 4, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:

7 A.M.   
Weather: Scattered cirrus
Temperature: 64F, Dew point: 57F, Wind: NNW at 6 kts
Sea-level pressure: 30.04 inches Hg, rising
Visibility: 35 miles, light haze
6-hour minimum temp: 60F
24-hour precipitation: 0.00
BHO SA 1155 250 SCT 35 173/64/57/3306/004/ 
LGT HZ INVSN PRSNT/ 8/001 53001 10064 20060

10 A.M. 
Weather: Scattered cirrus, few stratocumulus E-S
Temperature: 74F, Dew point: 59F, Wind: N at 8 kts
Wind: Direction variable NNW to ENE
Sea-level pressure: 30.04 inches Hg, rising
Visibility: 25 miles, hazy
BHO SA 1455 250 SCT 25 174/74/59/0108/004/ 
FEW SC DSNT E-S HAZY WND 33V06/ 8/501 53001

1 P.M. 
Weather: Thin scattered cirrus, few stratocumulus 
SW to N, moderate cumulus W to NW
Temperature: 77F, Dew point: 60F, Wind: NNE at 8 kts
Wind: Direction variable NW to E
Sea-level pressure: 30.04 inches, falling 
Visibility: 25 miles, hazy
6-hour max. temp: 77F
BHO SA 1755 250 –SCT 25 172/77/60/0308/004/ 
FEW SC SW-N MDT CU W-NW HAZY WND 32V08/ 
8/201 58002 10077 20064

WEATHER SUMMARY FOR THURSDAY, SEPTEMBER 3

TEMPERATURE (DEGREES F)
MAX.....77    NORMAL.....75
MIN.....56    NORMAL.....57 
MEAN....67    NORMAL.....66
 
DEPARTURE FROM 30-YEAR AVERAGE...........+1
TOTAL DEPARTURE FOR THE MONTH............-6 [-2.2 DEG/DAY] 

HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............19 SW  AT  3:15 A.M.
                   AEROVANE..............16 SE  AT  6:47 P.M.
                   ASOS..................17 WSW AT  3:15 A.M.
                   DAVIS................ 18 SW  AT  3:15 A.M.
FASTEST MILE FOR YESTERDAY...............14 SW  AT  3:31 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............13 SW  AT  5:36 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........N/A
AVERAGE WIND SPEED AND DIRECTION........8.3 SSW
                   ASOS.................7.9
                   DAVIS................8.1 SSW [200 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....-0.39
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........34.77   DEPARTURE....+0.91
                         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  77/56/67/+1/0/.../..     19 SW

9/4  our morning low temp: 60F; 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 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966

RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994

TODAY'S REPORT PREPARED BY: Stephanie Radner