BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 9, 2008  
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED
 
Today's observations:
 
8 A.M. EDT
Weather: Overcast 
Temperature: 52F, Dew point: 40F,  Wind: N at 6 kts 
Sea-level pressure: 29.84 inches of Hg, falling 
Visibility: 90 miles, estimated 100 miles NW
6-hour min temp: 54F 
24-hour precip: 0.05 in.
BHO SA 1155 E200 OVC 90 106/52/40/3506/984/ FEW AC SE-S 
VSBY ESTMTD 100 NW/ 8/077 58001 MANUAL 70005 ASOS 70004 10055 20050
 
11 A.M. EDT
Weather: Overcast nimbostratus, light rain
Temperature: 52F, Dew point: 42F,  Wind: ENE at 7 kts 
Sea-level pressure: 29.82 inches Hg, falling
Visibility: 40 miles, light rain 
3-hour precip: Trace
BHO SA 1455 E150 OVC 40R- 099/52/42/0607/982/ 
SUN DMLY VSBL PCPN VRY LGT/ 8/01/ 58007 MANUAL 6000/
  
2 P.M. EDT
Weather: Overcast nimbostratus, few stratus fractus, light rain
Temperature: 49F, Dew point: 45F,  Wind: E at 8 kts,
Wind: direction is variable ENE to SSE 
Sea-level pressure: 29.79 inches Hg, falling
Visibility: 20 miles, light rain
6-hour max. 55F 
6-hour precip: 0.02 in. 
BHO SA 1755 E80 OVC 20R- 089/49/45/0908/979/ FEW STFRA 
WND 06V15/ 8/72/ 58010 MANUAL 6002/ ASOS 60002 10055 20049
 
WEATHER SUMMARY FOR THURSDAY, MAY 8
 
TEMPERATURE (DEGREES F)
MAX.....75    NORMAL.....64
MIN.....54    NORMAL.....44
MEAN....65    NORMAL.....54
DEPARTURE FROM 30-YEAR NORMAL...........+11  
TOTAL DEPARTURE FOR THE MONTH............-1 [-0.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0  DEPARTURE.......-11
TOTAL HEATING UNITS FOR THE MONTH............96  DEPARTURE........-1  
TOTAL HEATING UNITS FOR THE SEASON.........5707  DEPARTURE......-416  
TOTAL HEATING UNITS LAST SEASON TO DATE....5699  DIFFERENCE.......+8
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............42 W   AT  5:34 P.M.
                   AEROVANE.............42 W   AT  5:34 P.M.  
                   ASOS.................40 W   AT  5:37 P.M.     
                   DAVIS................42 W   AT  5:27 P.M.   
FASTEST MILE FOR YESTERDAY............. 33 W   AT  5:41 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...........30 W   AT  5:42 P.M.     
MAXIMUM 2-MINUTE DAVIS AVERAGE..........33 W   AT  5:36 P.M.      
                   AVERAGE............ 16.8 W 
                   ASOS................16.5          
                   DAVIS...............16.8 SW [222 deg]   
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.05   DEPARTURE......-0.07  
                         ASOS..............0.04
TOTAL PRECIPITATION FOR THE MONTH..........0.41   DEPARTURE......-0.60
                         ASOS..............0.39
TOTAL PRECIPITATION FOR THE YEAR..........21.17   DEPARTURE......+2.21
                         ASOS.............23.62 #
# 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 W
5/2  48/42/45/-7/0.07/000/00     21 ENE
5/3  44/41/43/-10/0.09/000/00    25 E 
5/4  50/42/46/-7/0.17/000/00     27 E
5/5  69/40/55/+2/0/.../..        24 ESE
5/6  74/46/60/+6/0/.../..        25 W
5/7  75/48/62/+8/0/.../..        29 S
5/8  75/54/65/+11/0.08/.../..    42 W
 
5/9  morning low temp. 50F; our normal low is now 45F 
 
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 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: Stephanie Radner