BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 9, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
TEMPERATURES REACH THE MID-80'S WITH CONTINUED LOW HUMIDITY
FULL SUNSHINE THROUGH HIGH THIN CLOUDINESS
 
The temperature had reached 85 degrees by early this afternoon 
and combined with a dew point of 40 degrees, it's yet another
very dry day with relative humidity in the low to mid 20% range. 
The bright sunshine is being filtered by high thin cirrus clouds
and winds are only gentle to moderate from the S and SSW with 
gusts only up to about 20 MPH.
 
May continues to be a very sunny month with 77% of the possible
bright sunshine through the first 8 days.  Normal for May is 52%. 


Today's observations:
 
7 A.M.   
Weather: Scattered high thin cirrus clouds
Temperature: 61F, Dew point: 50F, Wind: SW 11 kts 
Sea-level pressure: 30.11 inches Hg, steady
Visibility: 35 miles, S 25 WNW 45 thin fog distant S, hazy  
6-hour min. 54 deg. 
BHO SA 1155 300 –SCT 35 196/61/50/2311/011/ AC DSNT WNW-NW
THN F DSNT S VSBY S 25 WNW 45 HAZY ALQDS/
8/041 51006 10061 20054
 
10 A.M.
Weather: Thin scattered high cirrus clouds 
Temperature: 78F, Dew point: 42F, Wind: SW at 09 kts
Wind: Direction variability S-WSW   
Sea-level pressure: 30.10 Hg, falling   
Visibility: 35 miles, hazy, visibility 45 miles WNW   
BHO SA 1455 250 –SCT 300 –SCT 35 193/78/42/2209/010/ 
VSBY WNW 45 HAZY ALQDS WND 18V25/ 8/001 58003
  
1 P.M. 
Weather: Thin broken high cirrus clouds  
Temperature: 84F, Dew point: 43F, Wind: S at 14G19 kts
Wind: Direction variability SE-SSW  
Sea-level pressure: 30.04 Hg, falling   
Visibility: 40 miles, light haze  
BHO SA 1755 250 –BKN 40 172/84/43/1714G19/004/ MSTLY CLR SKY E-SW
LGT HZ ALQDS VSBY WNW 50 WND 14V20/ 8/001 56021 10085 20061   
 
WEATHER SUMMARY FOR TUESDAY, MAY 8
 
TEMPERATURE (DEGREES F)
MAX.....77    NORMAL.....64 
MIN.....43    NORMAL.....44
MEAN....60    NORMAL.....54
DEPARTURE FROM 30-YEAR NORMAL...........+6
TOTAL DEPARTURE FOR THE MONTH..........+12 (+1.3 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY........... 5  DEPARTURE.........-6
TOTAL HEATING UNITS FOR THE MONTH...........83  DEPARTURE........-14 
TOTAL HEATING UNITS FOR THE SEASON........5699  DEPARTURE.......-424
TOTAL HEATING UNITS LAST SEASON TO DATE...5504  DIFFERENCE......+195
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............33  S  AT  5:02 P.M. *  
                   AEROVANE.............31  S  AT  4:46 P.M.   
                   ASOS.................32  S  AT  5:02 P.M.     
                   DAVIS................35  S  AT  7:49 P.M.      
FASTEST MILE FOR YESTERDAY..............26  S  AT  7:57 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...........26  S  AT  7:57 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........26  S  AT  9:02 P.M.     
AVERAGE WIND SPEED AND DIRECTION.......16.8 SSW  
                    ASOS...............17.2       
                    DAVIS..............16.7 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....-0.95 
                         ASOS..............0.04    
TOTAL PRECIPITATION FOR THE YEAR..........20.48   DEPARTURE....+1.52
                         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  morning low temp. 54 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 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
 
RECORDS FOR MAY 10
HIGH 93F IN 1896
LOW 29F IN 1900
PRE 1.85 INS IN 1998
SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990
 
TODAY'S REPORT PREPARED By: Robert Skilling