BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 2, 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.
Please come and join us for this interesting event.
 
EARLY MORNING SHOWERS LEAVE ONLY 0.06 INCH
 
The early morning light rain showers produced only 
0.06 inch of rainfall and it appears that May will 
get off to a dry start after a very wet April.   
 
Today's observations:
 
7 A.M.   
Weather: Overcast  
Temperature: 49F, Dew point: 43F, Wind: NE at 07 kts 
Sea-level pressure: 29.87 inches Hg, rising 
Visibility: 30 miles, 45 miles N-NE
6-hour min. 45F   
6 hr & 24-hour rainfall: 0.06  
BHO SA 1155 E33 OVC 30 114/46/43/0407/987/ FEW STFRA DSNT SE-SW 
CIG HIER DSNT N-NE BRGHT SPT IOVC DSNT NE ALG HRZN VSBY SW-NW 25 
N-NE 45 WND GRDL VEERING RE UKN/ 8/72/ 53011 ASOS 60004 MANUAL
6006/ ASOS 70004 MANUAL 70006 10056 20045  
 
10 A.M.
Weather: Overcast, small break in the west-northwest 
Temperature: 50F, Dew point: 43F, Wind: NW at 06 kts 
Sea-level pressure: 29.89 Hg, rising  
Visibility: 50 miles  
BHO SA 1455 20 SCT E33 OVC 50 121/50/43/3206/989/ 
SML BINOVC WNW/ 8/5// 51007 
  
1 P.M.
Weather: Broken cumulus, moderate cumulus and stratocumulus 
Temperature: 59F, Dew point: 39F, Wind: W at 08 kts 
Sea-level pressure: 29.89 inches Hg, steady 
Visibility: 80 miles 
6-hourly max. temp. 59 deg. 
BHO SA 1755 E40 BKN 80 120/59/39/2808/989/ MDT CU AND CU XCPT 
DSNT NE-E/ 8/400 58001 10059 20046  
 
WEATHER SUMMARY FOR TUESDAY, MAY 1
 
TEMPERATURE (DEGREES F)
MAX.....67    NORMAL.....62 
MIN.....44    NORMAL.....42
MEAN....56    NORMAL.....52
DEPARTURE FROM 30-YEAR NORMAL...........+4
TOTAL DEPARTURE FOR THE MONTH.......... +4 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............9  DEPARTURE.........-4
TOTAL HEATING UNITS FOR THE MONTH.........   9  DEPARTURE.........-4 
TOTAL HEATING UNITS FOR THE SEASON........5625  DEPARTURE.......-414
TOTAL HEATING UNITS LAST SEASON TO DATE...5419  DIFFERENCE......+197
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............33  NW  AT 12:25 A.M. 
                   AEROVANE.............33  NW  AT 12:25 A.M. 
                   ASOS.................31  NW  AT 12:25 A.M.  
                   DAVIS................34  WNW AT n/a  
FASTEST MILE FOR YESTERDAY..............24  WNW AT 12:35 A.M. *  
MAXIMUM 2-MINUTE ASOS AVERAGE...........24  WNW AT 12:12 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........25  WNW AT n/a  
AVERAGE WIND SPEED AND DIRECTION.......11.8 W 
                    ASOS...............11.9     
                    DAVIS..............13.0 W [280 degrees] 
* Last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.06   DEPARTURE....-0.07
                         ASOS..............0.04
TOTAL PRECIPITATION FOR THE MONTH..........0.06   DEPARTURE....-0.07 
                         ASOS..............0.04    
TOTAL PRECIPITATION FOR THE YEAR..........20.48   DEPARTURE....+2.40
                         ASOS.............20.01    
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.1
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/.../..   33 NW 
 
5/2  morning low temp. 45 deg; normal now 42 deg.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 2
HIGH 92F IN 2001
LOW 29F IN 1903
PRECIP 1.36 INCHES IN 2006
SNOWFALL 1.0 INS IN 1888
PEAK GUST 58 MPH S IN 1983
 
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
 
TODAY'S REPORT PREPARED By: Robert Skilling