BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 15, 2008  
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED
 
Today's observations:
 
8 A.M. EDT
Weather: Overcast altocumulus/altostratus, break in 
overcast N-E, bright spots NE-SE
Temperature: 52F, Dew point: 30F,  Wind: SSW at 11 kts
Sea-level pressure: 29.98 inches Hg, rising
Visibility: 50 miles
6-hour min temp: 47F
BHO SA 1155 E110 OVC 50 154/52/30/2111/998/ BINOVC N-E 
BRGHT SPTS NE-SE DRK K LYR N-NE/ 8/07/ 53004 10052 20047
 
11 A.M. EDT
Weather: Overcast altocumulus/altostratus, very light rain 
Temperature: 59F, Dew point: 32F,  Wind: S at 10 kts
Sea-level pressure: 29.98 inches Hg, falling
Visibility: 45 miles
3-hour precip: Trace
BHO SA 1455 E90 OVC 45R- 151/59/32/1810/998/ BINOVC N 
RB35E55 PCPN VRY LGT/ 8/07/ 58003 MANUAL 6000/
 
2 P.M. EDT
Weather: Overcast altocumulus/altostratus, small breaks
Temperature: 66F, Dew point: 39F,  Wind: SSE at 7 kts 
Sea-level pressure: 29.93 inches Hg, falling
Visibility: 40 miles, hazy
6-hour max temp: 66F
6-hour precip: Trace
BHO SA 1755 E70 OVC 40 135/66/39/1607/993/ NMRS SML BINOVC 
HAZY/ 8/07/ 56016 MANUAL 6000/ 10066 20052
 
WEATHER SUMMARY FOR WEDNESDAY, MAY 14
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....67
MIN.....47    NORMAL.....46
MEAN....56    NORMAL.....57
 
DEPARTURE FROM 30-YEAR NORMAL............-1  
TOTAL DEPARTURE FOR THE MONTH...........-31 [-2.4 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............9  DEPARTURE.........0
TOTAL HEATING UNITS FOR THE MONTH...........182  DEPARTURE.......+26 
TOTAL HEATING UNITS FOR THE SEASON.........5793  DEPARTURE......-389 
TOTAL HEATING UNITS LAST SEASON TO DATE....5725  DIFFERENCE......+68
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23 ENE  AT  1:22 P.M. 
                   AEROVANE.............21 ENE  AT  1:33 P.M. *   
                   ASOS.................23 E    AT  1:22 P.M.    
                   DAVIS................22 ENE  AT  1:22 P.M.    
FASTEST MILE FOR YESTERDAY..............18 ENE  AT  1:24 P.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 ENE  AT  1:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........18 ENE  AT  1:22 P.M.  
                   AVERAGE............9.2 NNE  
                   ASOS...............9.4   
                   DAVIS..............9.2 ENE [072 deg]    
* 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..........0.67   DEPARTURE......-1.06
                         ASOS..............0.62
TOTAL PRECIPITATION FOR THE YEAR..........21.43   DEPARTURE......+1.75
                         ASOS.............23.85 #
# Includes erroneous ASOS precipitation data on 2/13/08.
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available, records not finalized
 
5/1  60/35/48/-4/0/786/93        30 W    Aero 28 MPH W
5/2  48/42/45/-7/0.07/000/00     21 ENE
5/3  43/41/42/-11/0.09/000/00    25 E    
5/4  50/42/46/-7/0.17/000/00     27 E
5/5  69/40/55/+2/0/752/88        24 ESE  
5/6  74/46/60/+6/0/686/80        25 W
5/7  75/48/62/+8/0/722/84        29 S
5/8  75/54/65/+11/0.08/172/20    42 W    Aero 42 MPH W 
5/9  56/43/50/-5/0.26/000/00     30 NE
5/10 57/44/51/-4/T/407/47        35 NNE  
5/11 58/41/50/-5/0/747/86        24 ENE  
5/12 47/42/45/-11/0/017/02       43 NNE  Aero 43 MPH NNE
5/13 63/43/53/-3/0/812/93        47 NNE  Aero 50 MPH NNE
5/14 64/47/56/-1/0/.../..        23 ENE
 
5/15 morning low temp. 47F; our normal low is now 47F
 
NEW DAILY RECORDS FOR MAY 2008
None to date.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 15
HIGH 93F IN 1900
LOW 36F IN 1947,1985
PRECIP 1.63 INCHES IN 1978
PEAK GUST 53e MPH NE IN 1978, W 2002
 
RECORDS FOR MAY 16
HIGH 90F IN 1951
LOW 30F IN 1936
PRECIP 2.63 INCHES IN 1954
PEAK GUST 56e MPH NW IN 1952
 
TODAY'S REPORT PREPARED By: Stephanie Radner