BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 8, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLEAR, WARM AND EXTREMELY DRY TODAY
 
Just a few high thin cirrus clouds are visible in the
sky today and visibility is up to 70 to 75 miles. 
High temperatures have reached the mid-70's early this
afternoon for the warmest readings since 85 degrees was
recorded on April 23rd.
 
The relative humidity had dropped to 14% shortly after 
noon today with a temperature of 75 degrees and dewpoint
of 23 degrees. And, very dry conditions continue
to prevail for this month to date with just 0.06 inch of
rainfall and and average relative humidities of 29% for 
both 2 p.m. and 8 p.m. so far for May.  
 
May has been a very sunny month to date with 74% of the 
possible bright sunshine during the first week.  
 
Today's observations:
 
7 A.M.   
Weather: Scattered high thin cirrus clouds
Temperature: 52F, Dew point: 27F, Wind: SW 11G20 kts 
Sea-level pressure: 30.26 inches Hg, rising
Visibility: 75 miles 
6-hour min. 43F 
BHO SA 1155 250 –SCT 300 –SCT 75 248/52/27/2211G20/026/
8/001 53002 10052 20043 
 
10 A.M.
Weather: High thin scattered cirrus  
Temperature: 68F, Dew point: 25F, Wind: SW at 11 kts
Wind: Direction variability S-WSW, gust 21 kts past hour  
Sea-level pressure: 30.24 Hg, falling   
Visibility: 75 miles  
BHO SA 1455 250 –SCT 300 –SCT 75 239/68/25/2211/024/
WND 18V25/ 8/001 58009 
 
1 P.M. 
Weather: Thin scattered high cirrus clouds  
Temperature: 77F, Dew point: 30F, Wind: S at 12G20 kts
Wind: Direction variability SE-SSW  
Sea-level pressure: 30.15 Hg, falling   
Visibility: 70 miles  
BHO SA 1755 300 –SCT 70 211/77/30/1812G20/015/
LWR CI NW-NE WND 14V21/ 8/001 58028 10077 20052    
 
WEATHER SUMMARY FOR MONDAY, MAY 7
 
TEMPERATURE (DEGREES F)
MAX.....68    NORMAL.....64 
MIN.....39    NORMAL.....44
MEAN....54    NORMAL.....54
DEPARTURE FROM 30-YEAR NORMAL........... 0
TOTAL DEPARTURE FOR THE MONTH..........+ 6 (+0.7 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...........11  DEPARTURE......... 0
TOTAL HEATING UNITS FOR THE MONTH...........78  DEPARTURE.........-8 
TOTAL HEATING UNITS FOR THE SEASON........5694  DEPARTURE.......-418
TOTAL HEATING UNITS LAST SEASON TO DATE...5493  DIFFERENCE......+201
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............25  S  AT 11:56 P.M. *  
                   AEROVANE.............24  S  AT  3:32 A.M.  
                   ASOS.................25  S  AT 11:50 P.M.    
                   DAVIS................25  S  AT 10:32 P.M.     
FASTEST MILE FOR YESTERDAY..............N/A 
MAXIMUM 2-MINUTE ASOS AVERAGE...........20  S  AT 11:53 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE..........18  S  AT 10:49 P.M.    
AVERAGE WIND SPEED AND DIRECTION....... 8.9 S
                    ASOS...............10.2       
                    DAVIS.............. 7.6 SSW [200 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....-0.83 
                         ASOS..............0.04    
TOTAL PRECIPITATION FOR THE YEAR..........20.48   DEPARTURE....+1.64
                         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  morning low temp. 43 deg; normal now 44 deg.   
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 8
HIGH 89F IN 2000
LOW 29F IN 1956
PRECIP 1.48 INCHES IN 1886
SNOWFALL TRACE IN 1898, 1947
PEAK GUST 68e MPH NNW IN 1943
 
RECORDS FOR MAY 9
HIGH 93F IN 2000
LOW 31F IN 1947
PRECIP 2.72 INCHES IN 1954
SNOWFALL 5.0 INS IN 1977 (RECORD FOR MAY)
PEAK GUST 70e MPH NE IN 1977
 
TODAY'S REPORT PREPARED By: Robert Skilling