BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 11, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Broken clouds
Temperature: 64F, Dew point: 59F, Wind: S at 08 kts 
Sea-level pressure: 29.93 inches Hg, rising
Visibility: 20 miles  
6-hour min. 60 deg. 
BHO SA 1155 40 SCT E120 BKN 250 BKN 20 134/64/59/1808/993/ 
FEW LWR STFRA DRFTG OVR STN/ 8/681 52001 10064 20060
 
10 A.M.
Weather: Broken clouds
Temperature: 72F, Dew point: 60F, Wind: S at 12 kts
Sea-level pressure: 29.90 Hg, falling   
Visibility: 15 miles, NE-S 30 miles, W-N 10 miles   
BHO SA 1455 40 SCT E110 BKN 15 124/72/60/1812/990/ 
VSBY NE-S 30 W-N 10/ 8/580 55010
 
1 P.M. 
Weather: Overcast, light rain  
Temperature: 66F, Dew point: 63F, Wind: SW at 05 kts
Sea-level pressure: 29.88 Hg, falling   
Visibility: 12 miles, variable 10-15 miles
6-hourly rainfall: 0.02 in. 
BHO SA 1755 E30 BKN 40 OVC 12VRW- 117/66/63/2205/988/ FEW LWR STFRA 
ALQDS XCPT SE-S BINOVC NNW HIER CLDS VSBL VSBY 10V15 THN F 
PCPN VRY LGT/ 8/7// 58007 ASOS 60002 MANUAL 6002/ 10073 20064
 
 
WEATHER SUMMARY FOR THURSDAY, MAY 10
 
TEMPERATURE (DEGREES F)
MAX.....85    NORMAL.....65 
MIN.....60    NORMAL.....45
MEAN....73    NORMAL.....55
DEPARTURE FROM 30-YEAR NORMAL..........+18
TOTAL DEPARTURE FOR THE MONTH..........+45 (+4.3 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY........... 0  DEPARTURE........-10
TOTAL HEATING UNITS FOR THE MONTH...........83  DEPARTURE........-35 
TOTAL HEATING UNITS FOR THE SEASON........5699  DEPARTURE.......-445
TOTAL HEATING UNITS LAST SEASON TO DATE...5539  DIFFERENCE......+160
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............29  S   AT  4:51 P.M.   
                   AEROVANE.............27  S   AT  4:51 P.M. 
                   ASOS.................26  S   AT 11:05 P.M.     
                   DAVIS................29  SE  AT  2:38 P.M.      
FASTEST MILE FOR YESTERDAY..............20  S   AT  4:53 P.M. *   
MAXIMUM 2-MINUTE ASOS AVERAGE...........21  S   AT  6:44 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........22  SSE AT  2:37 P.M.     
AVERAGE WIND SPEED AND DIRECTION.......13.4 S  
                    ASOS...............13.8       
                    DAVIS..............13.0 S [180 degrees]
* 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..........0.06   DEPARTURE....-1.19 
                         ASOS..............0.04    
TOTAL PRECIPITATION FOR THE YEAR..........20.48   DEPARTURE....+1.28
                         ASOS.............20.01    
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......0.0
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE......-0.1 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-32.5  
    
PRELIMINARY CLIMATE SUMMARY FOR MAY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
5/1  67/44/56/+4/0/0/624/74      33 NW 
5/2  64/45/55/+3/0.06/0/381/45   36 NW    Aero 33 MPH WNW
5/3  67/42/55/+2/0/0/849/100     38 W     Aero 37 MPH W
5/4  66/44/55/+2/0/0/842/99      39 WNW   Aero 40 MPH WNW 
5/5  65/45/55/+2/0/0/384/45      33 N  
5/6  51/42/47/-7/T/0/514/60      36 N     Aero 33 MPH N 
5/7  68/39/54/0/0/0/798/93       25 S
5/8  77/43/60/+6/0/0/851/99      33 S     Aero 31 MPH S 
5/9  85/54/70/+15/0/0/707/92     30 S 
5/10 85/60/73/+18/0/0/692/80     29 S     Aero 27 MPH S
 
5/11  morning low temp. 60 deg.; normal now 45 deg.    
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRECIP 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945
 
RECORDS FOR MAY 12
HIGH 88F IN 2001
LOW 29F IN 1907
PRECIP 1.49 INCHES IN 1968
PEAK GUST 76 MPH S IN 1974
 
TODAY'S REPORT PREPARED By: Stephanie Radner