BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 13, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 

Today's observations:
 
7 A.M.   
Weather: Chaotic sky
Temperature: 51F, Dew point: 42F, Wind: WNW at 8 kt  
Sea-level pressure: 30.09 inches Hg, rising
Visibility: 50 miles 
6-hour min. 46F
24-hour precip. 0.02 inches
BHO SA 1155 70 SCT 120 SCT 180 SCT 50 191/51/42/3008/009/ 
CHAOTIC SKY CLR N-S/ 8/146 53019 70002 10051 20046
 
10 A.M.
Weather: Scattered cirrus with a few cumulus forming
Temperature: 57F, Dew point: 28F, Wind: NE at 10 kt
Sea-level pressure: 30.12 inches Hg, rising  
Visibility: 55 miles  
BHO SA 1455 250 –SCT 55 201/57/28/0410/012/ 
FEW SC FRMG ALQDS WND 32V09/ 8/401 51010 
 
 
WEATHER SUMMARY FOR SATURDAY, MAY 12
 
TEMPERATURE (DEGREES F)
MAX.....63    NORMAL.....66 
MIN.....47    NORMAL.....46
MEAN....55    NORMAL.....56
DEPARTURE FROM 30-YEAR NORMAL...........-1
TOTAL DEPARTURE FOR THE MONTH..........+56 (+4.5 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...........10  DEPARTURE..........0
TOTAL HEATING UNITS FOR THE MONTH...........93  DEPARTURE........-41 
TOTAL HEATING UNITS FOR THE SEASON........5709  DEPARTURE.......-455
TOTAL HEATING UNITS LAST SEASON TO DATE...5570  DIFFERENCE......+139
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............32  NE  AT  9:18 A.M. *
                   AEROVANE.............32  NE  AT  5:23 A.M. 
                   ASOS.................30  NE  AT  9:19 A.M.
                   DAVIS................30  NE
FASTEST MILE FOR YESTERDAY..............24  NE  AT  8:52 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........22  NE  AT  8:53 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........21  ENE AT  8:53 A.M.
AVERAGE WIND SPEED AND DIRECTION.......11.4 NE
                    ASOS...............11.6   
                    DAVIS..............11.6 ENE [56 degrees] 
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02   DEPARTURE....-0.10
                         ASOS..............0.02
TOTAL PRECIPITATION FOR THE MONTH..........0.10   DEPARTURE....-1.39 
                         ASOS..............0.08    
TOTAL PRECIPITATION FOR THE YEAR..........20.52   DEPARTURE....+1.08
                         ASOS.............20.05    
 
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 74/60/67/+12/0.02/0/.../..  23 S
5/12 63/47/55/-1/.../0/.../..    32 NE   
 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 13
HIGH 85F IN 1947
LOW 35F IN 1914, 2005
PRECIP 2.39 INCHES IN 2006
PEAK GUST 49 MPH NNW IN 1965
 
RECORDS FOR MAY 14
HIGH 85F IN 1961
LOW 33F IN 1895
PRECIP 1.93 INCHES IN 2006
PEAK GUST 50e MPH SW IN 1976

TODAY'S REPORT PREPARED By: Andrew Hoell