BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 7, 2009 LABOR DAY
ALL TIMES ARE IN EASTERN STANDARD TIME
 
GREAT WEATHER CONTINUES DURING THE LABOR DAY
WEEKEND AS LONG DRY SPELL ENTERS ITS 9TH DAY 
 
An increase in high cloudiness dimmed an
otherwise bright sunny day again today 
for the third day of the long holiday weekend.
A spell of very dry weather continued for a 9th
consecutive day. The last day of rainfall
occurred on 29 August. Our temperatures
have now turned cooler than normal for
September after a cool day to begin the
month and another cool day yesterday when
the high temperature of only 64F was ten
below the average for the date. 
 
Today's observations:
 
7 A.M.  
Weather: Thin scattered cirrus, lone cumulus forming over
the city north, few cumulus ENE-E and stratocumulus
distant NW and distant ENE-SE  
Temperature: 55F, Dew point: 49F, Wind: Calm
Sea-level pressure: 30.35 inches Hg, falling
Visibility: 35 miles, 50 miles west-northwest above
inversion, few patches dense shallow ground fog and
steam fog dissipated ESE-S during past hour
6-hour minimum temp: 52F
BHO SA 1155 250 –SCT 300 –SCT 35 277/55/49/0000/035/
LONE CU FRMG OVR CTY N FEW CU ENE-E SC DSNT ENE-SE ALG
HRZN INVSN DSSPTG FEW PTCHS DENS SHLW GF/STEAM FOG ESE-S
DSSPTD PST HR VSBY WNW 55 LGT HAZE ALQDS/
8/501 58004 10055 20052
 
10 A.M.
Weather: High thin overcast, cirrus and cirrostratus,
stratocumulus all quadrants 
Temperature: 64F, Dew point: 50F, Wind: S at 2 kts (estimated)
Sea-level pressure: 30.32 inches Hg, falling
Visibility: 55 miles
BHO SA 1455 250 –OVC 55 268/64/50/E1702/032/
SC ALQDS WND L/V/ 8/507
 
1 P.M.
Weather: Broken dense cirrus, overcast cirrus and
cirrostratus, thin spots in overcast, few distant
cumulus west thru north  
Temperature: 68F, Dew point: 51F, Wind: S at 3 kts,
Wind: light and variable 
Sea-level pressure: 30.27 inches Hg, falling
Visibility: 60 miles
6-hour max. temp: 68F
BHO SA 1755 E220 BKN 250 OVC 60 249/68/51/1903/027/
FEW DSNT CU W-N LGT DENS CI THN SPTS IOVC ALQDS
LGT DSNT HZ WND LGT/ 8/102 58019 10068 20055
 
WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 6
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....74
MIN.....53    NORMAL.....56
MEAN....59    NORMAL.....65
 
DEPARTURE FROM 30-YEAR AVERAGE...........-6
TOTAL DEPARTURE FOR THE MONTH............-4 [-0.9 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............31 NNE AT  6:02 A.M.
                   AEROVANE..............27 NNE AT  7:23 A.M. * 
                   ASOS..................30 NNE AT  6:02 A.M.
                   DAVIS................ 26 NE  AT  7:10 A.M.
FASTEST MILE FOR YESTERDAY...............20 NE  AT  9:55 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............20 NE  AT  9:55 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........20 NE  AT  8:45 A.M.
AVERAGE WIND SPEED AND DIRECTION.......11.3 NE 
                   ASOS................10.6
                   DAVIS...............11.1 NE [040 DEG]
* last of several occurrences.....
 
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....-0.78
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........34.77   DEPARTURE....+0.52
                         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  77/60/69/+3/0/.../..     18 NE
9/5  81/59/70/+5/0/.../..     25 NNW
9/6  64/53/59/-6/0/.../..     31 NNE
 
9/7  our morning low temp: 52F; the normal low is now 56F
 
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 7
HIGH 92F IN 2007
LOW 40F IN 1888
PRECIP 2.95 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941
 
RECORDS FOR SEPTEMBER 8
HIGH 93F IN 2007
LOW 42F IN 1978
PRECIP 0.74 INCHES IN 1888
PEAK GUST 40e MPH NW IN 1941, WSW IN 1944
 
TODAY'S REPORT PREPARED BY: Robert Skilling