BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY SEPTEMBER 13, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MOSTLY SUNNY, DRY, AND NEAR NORMAL TEMPERATURES
 
Since the record heat on September 7-8 our daily 
temperatures have averaged very close to normal 
and not varying by more than a degree from the 
average.  Despite the heavy rainfall on September
11th, many dry days this month has left the monthly
rainfall total now falling below normal once again. 
 
Today's observations:
 
7 A.M.   
Weather: Clear, trace of stratocumulus clouds distant SE-S 
Temperature: 55F, Dew point: 48F, Wind: WNW at 10 kts 
Sea-level pressure: 30.22 inches Hg, rising
Visibility: 70 miles    
6-hour min temp: 52F
24-hour rainfall: 0.00 in. 
BHO SA 1155 CLR 70 233/55/48/3010/022/ FEW SC NR HRZN DSNT SE-S/ 
8/500 51020 10055 20052 
   
10 A.M.   
Weather: Clear, cumulus, few moderate distant SE-SW-N   
Temperature: 67F, Dew point: 46F, Wind: NNW at 06 kts 
Wind: Light
Sea-level pressure: 30.25 inches Hg, rising
Visibility: 75 miles   
BHO SA 1455 CLR 75 243/67/46/3306/025/ CU/FEW MDT DSNT SE-SW-N
WND LGT/ 8/200 51010 
 
1 P.M.   
Weather: Scattered cumulus/stratocumulus 
Temperature: 72F, Dew point: 45F, Wind: SW at 05 kts
Wind: light and variable
Sea-level pressure: 30.22 inches Hg, falling
Visibility: 75 miles
6-hour max. temp: 73F 
BHO SA 1755 60 SCT 75 234/72/45/2305/022/ CU/SC/FEW MDT CU 
WND L/V/ 8/400 58009 10073 20055  
 
WEATHER SUMMARY FOR WEDNESDAY, SEPTEMBER 12
 
TEMPERATURE (DEGREES F)
MAX.....73    NORMAL.....72 
MIN.....55    NORMAL.....54
MEAN....64    NORMAL.....63
DEPARTURE FROM 30-YEAR NORMAL.........+1 
TOTAL DEPARTURE FOR THE MONTH........+34  [+2.6 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............35 W   AT 1:13 P.M. *     
                   AEROVANE...............33 W   AT 12:30 P.M. *    
                   ASOS...................N/A  #
                   DAVIS..................35 W   AT 9:55 A.M.  
FASTEST MILE FOR YESTERDAY............... 26 W   AT   
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............28 W   AT 11:02 A.M.   
AVERAGE WIND SPEED AND DIRECTION..........16.7 W  
                   ASOS...................N/A  #
                   DAVIS..................17.1 WSW [250 deg]   
* last of several occurrences...
 
# ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN 
  THAT DATA WILL RESUME
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00  DEPARTURE.....-0.14
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE MONTH..........1.53  DEPARTURE.....-0.08  
                         ASOS..............1.56    
TOTAL PRECIPITATION FOR THE YEAR..........32.52  DEPARTURE.....-2.56
                         ASOS.............31.79    
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2007...CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
9/1  79/57/68/+1/0/790/100    25 WNW   
9/2  78/51/65/-1/0/787/100    22 S   
9/3  85/57/71/+5/0/760/97     31 SSW AERO 28 MPH SSW 
9/4  76/61/69/+3/0/641/82     28 NW  AERO 26 MPH NW
9/5  74/53/64/-1/0/732/94     21 ESE 
9/6  76/55/66/+1/0/380/49     31 S
9/7  92/62/77/+12/0/680/88*   30 SSW
9/8  93/67/80/+15/0/686/89    31 S    TSTM 
9/9  72/57/65/+1/0.16/000/00  28 NNE  TSTM 
9/10 66/57/62/-2/0.03/000/00  18 NNE
9/11 68/58/63/-1/1.34/000/00  30 WNW  
9/12 73/55/64/+1/0/.../..     35 W   Aero 33 MPH W
 
9/13 morning low temp. of 52F; normal low now 54F
 
* sunshine minutes and % corrected  
 
NEW DAILY RECORDS FOR SEPTEMBER 2007: 
 
9/7 - RECORD HIGH TEMPERATURE 92; PREVIOUS 91 IN 1945.
9/8 - RECORD HIGH TEMPERATURE 93; PREVIOUS 91 IN 1945.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986
 
RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944
PEAK GUST 96e MPH E IN 1944
 
TODAY'S REPORT PREPARED By: Robert Skilling