BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MAY 10, 2008  
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED

Today's observations:

8 A.M. EDT
Weather: Overcast stratocumulus
Temperature: 46F, Dew point: 44F,  Wind: N at 13G21 kts 
Wind: Variable direction NNW-NE
Sea-level pressure: 29.68 inches of Hg, rising 
Visibility: 25 miles, 15 miles E-SSE, 45 miles NW
6-hour min temp: 44F 
24-hour precip: 0.26 in.
BHO SA 1155 E10 OVC 25 051/46/44/0113G21/968/ VSBY E-SSE 15 
NW 45 PK WND 0129/22 WND 34V04/ 8/5// 51017 6000/ 70026 10046 
20044

11 A.M. EDT
Weather: Overcast stratocumulus
Temperature: 48F, Dew point: 42F,  Wind: N at 14G22 kts 
Wind: Variable direction NNW-NE
Sea-level pressure: 29.74 inches Hg, rising
Visibility: 45 miles, 30 miles SE, 55 miles NW 
BHO SA 1455 E12 OVC 45 071/48/42/0114G22/974/ VSBY SE 30 NW 55 
WND 34V04/ 8/5// 53020

 
WEATHER SUMMARY FOR FRIDAY, MAY 9

TEMPERATURE (DEGREES F)
MAX.....56    NORMAL.....65
MIN.....43    NORMAL.....45
MEAN....50    NORMAL.....55
DEPARTURE FROM 30-YEAR NORMAL............-5  
TOTAL DEPARTURE FOR THE MONTH............-7* [-1.9 DEGREES/DAY] 
* Adjusted.

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............15  DEPARTURE........+4
TOTAL HEATING UNITS FOR THE MONTH...........112* DEPARTURE........+4* 
TOTAL HEATING UNITS FOR THE SEASON.........5723* DEPARTURE......-411*  
TOTAL HEATING UNITS LAST SEASON TO DATE....5699  DIFFERENCE......+24
* Adjusted.
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............30 NE  AT  9:47 P.M.
                   AEROVANE.............26 NNE AT 11:13 P.M.  
                   ASOS.................28 NE  AT 10:58 P.M. 
                   DAVIS................28 NE  AT  9:46 P.M. 
FASTEST MILE FOR YESTERDAY..............18 NNE AT 11:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........18 NE  AT 10:58 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 NE  AT  9:48 P.M. 
                   AVERAGE............11.4 NE 
                   ASOS...............10.6    
                   DAVIS..............11.0 NE [34 deg]    

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.26   DEPARTURE......+0.14  
                         ASOS..............0.23
TOTAL PRECIPITATION FOR THE MONTH..........0.67   DEPARTURE......-0.46
                         ASOS..............0.62
TOTAL PRECIPITATION FOR THE YEAR..........21.43   DEPARTURE......+2.35
                         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 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/.../..        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  56/43/50/-5/0.26/.../..     30 NE
* 3rd: Max temp changed to 43, mean and departure adjusted.
* 5th: Mean temp and departure corrected. 

5/10 morning low temp. 44F; 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 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

RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRE 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945
 
TODAY'S REPORT PREPARED By: Mike Iacono