BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 3, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
OBSERVATORY ANNUAL OPEN HOUSE TO BE HELD THIS 
SATURDAY, MAY 5, 2007
 
The annual Spring Open House at Blue Hill Observatory  
is scheduled to be held from 10 a.m. to 4 p.m. this 
Saturday, May 5, 2007, here at the summit.
 
 
Today's observations:
 
7 A.M.   
Weather: Clear 
Temperature: 50F, Dew point: 26F, Wind: WNW at 09 kts 
Sea-level pressure: 30.16 inches Hg, rising 
Visibility: 75 miles
6-hour min. 42F   
BHO SA 1155 CLR 75 215/50/26/2909/016/ FEW CI DSNT SE-SW/ 
8/001 51019 10050 20042
 
10 A.M.
Weather: Clear
Temperature: 58F, Dew point: 19F, Wind: WNW at 15 kts 
Sea-level pressure: 30.15 Hg, falling  
Visibility: 75 miles  
BHO SA 1455 CLR 75 211/58/19/2915/015/ FEW CI DSNT SE-SW 
WND 25V34/ 8/001 56004
  
1 P.M.
Weather: Clear 
Temperature: 65F, Dew point: 18F, Wind: WNW at 11G26 kts 
Sea-level pressure: 30.11 inches Hg, falling 
Visibility: 75 miles 
6-hourly max. temp. 66 deg. 
BHO SA 1755 CLR 75 197/65/18/3011G26/011/ FEW CI DSNT SE-SW 
PK WND 2926/48 WND 25V33/ 8/001 58014 10066 20050
 
WEATHER SUMMARY FOR WEDNESDAY, MAY 2
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....62 
MIN.....45    NORMAL.....43
MEAN....55    NORMAL.....52
DEPARTURE FROM 30-YEAR NORMAL...........+3
TOTAL DEPARTURE FOR THE MONTH.......... +7 (+3.3 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...........10  DEPARTURE.........-3
TOTAL HEATING UNITS FOR THE MONTH...........19  DEPARTURE.........-7 
TOTAL HEATING UNITS FOR THE SEASON........5635  DEPARTURE.......-417
TOTAL HEATING UNITS LAST SEASON TO DATE...5458  DIFFERENCE......+177
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............36  NW  AT  6:07 P.M. 
                   AEROVANE.............33  WNW AT  6:08 P.M. 
                   ASOS.................31  NW  AT  6:09 P.M.  
                   DAVIS................33  NW  AT  6:07 P.M.  
FASTEST MILE FOR YESTERDAY..............26  WNW AT  6:08 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...........24  NW  AT  6:09 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........25  NW  AT  6:09 P.M.  
AVERAGE WIND SPEED AND DIRECTION........9.1 WNW 
                    ASOS................9.3     
                    DAVIS...............9.2 WNW [300 degrees] 
 
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 THE MONTH..........0.06   DEPARTURE....-0.20 
                         ASOS..............0.04    
TOTAL PRECIPITATION FOR THE YEAR..........20.48   DEPARTURE....+2.27
                         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  morning low temp. 42 deg; normal now 43 deg.
 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002
 
RECORDS FOR MAY 4
HIGH 90F IN 2001
LOW 27F IN 1911 (RECORD FOR MAY)
PRECIP 1.92 INCHES IN 1893
SNOWFALL 0.1 INCHES IN 1920
PEAK GUST 60 MPH NW IN 1966
 
TODAY'S REPORT PREPARED By: Stephanie Radner