BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 12, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME 
 
Today's Observations:
 
7 A.M.
Weather: Broken stratocumulus 
Temperature: 32F, Dew point: 16F, Wind: WNW at 20G33 kt
Sea-level pressure: 29.96 inches Hg, rising
Visibility: 70 miles 
6-hour minimum temperature: 31F
24-hour precip: 0.59 inches
24-hour snowfall: 0.2 inches
BHO SA 1155 70 BKN 70 145/32/16/3020G33/996/
TOTAL NEW SNW PST 24 HR 0.2 IN CLR DSNT SW-NW PK WND 3033/1145/
8/500 53018 70059 10036 20031
 
10 A.M.
Weather: Scattered stratocumulus
Temperature: 37F, Dew point: 16F, Wind: WNW at 16G26 kt
Sea-level pressure: 29.97 inches Hg, rising
Visibility: 70 miles
BHO SA 1455 70 SCT 70 148/37/16/3016G26/997/
CLR NE PK WND 3032/1423/ 8/500 53003
 
WEATHER SUMMARY FOR SATURDAY, APRIL 11, 2009
 
TEMPERATURE (DEGREES F)
MAX.....44    NORMAL.....54
MIN.....33    NORMAL.....36
MEAN....39    NORMAL.....45
 
DEPARTURE FROM 30-YEAR NORMAL..................-6
TOTAL DEPARTURE FOR THE MONTH.................+23  [+1.9 DEGREE/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............26  DEPARTURE.........+6
TOTAL HEATING UNITS FOR THE MONTH............219  DEPARTURE........-23
TOTAL HEATING UNITS FOR THE SEASON..........5637  DEPARTURE........-69
TOTAL HEATING UNITS LAST SEASON TO DATE.....5370  DIFFERENCE......+267
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............35 N  AT 12:05 P.M. 
                   AEROVANE.............30 N  AT 11:45 P.M. 
                   ASOS.................31 NE AT 12:06 P.M. 
                   DAVIS................33 N  AT 12:05 P.M.   
FASTEST MILE FOR YESTERDAY..............25 N  AT 12:06 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE...........22 NE AT 12:07 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE..........21 N  AT 12:07 P.M. 
                   AVERAGE............12.3 N
                   ASOS...............11.9
                   DAVIS..............11.7 N [9 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.59 DEPARTURE.........+0.44
                         ASOS...............0.57
TOTAL PRECIPITATION FOR THE MONTH...........3.23 DEPARTURE.........+1.58
                         ASOS...............3.28
TOTAL PRECIPITATION FOR THE YEAR...........13.31 DEPARTURE.........-1.97
                         ASOS..............14.41 #
# Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09.
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.2   DEPARTURE.........+0.1
TOTAL SNOWFALL FOR THE MONTH................0.2   DEPARTURE.........-1.0
TOTAL SNOWFALL FOR THE SEASON..............78.9   DEPARTURE........+20.8
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
4/1  43/31/38/-3/0.13/0/015/02       24 SE    
4/2  52/39/46/+4/0.02/0/000/00       20 SSE        
4/3  58/45/52/+10/0.70//000/00       39 SSE   AERO 38 MPH SSE TSTM
4/4  51/38/45/+3/0.01/0/.../..       48 WSW   AERO 48 MPH WSW 
4/5  58/37/48/+5/0/0/551/71          40 W     AERO 37 MPH W
4/6  55/38/47/+4/1.42/0/047/006      42 SE    AER0 40 MPH SE  TSTM 
4/7  50/34/42/-1/T/0/.../..          36 WSW   AERO 35 MPH WSW
4/8  45/32/39/-5/0/0/.../..          33 SW    AERO 31 MPH SW
4/9  60/34/47/+3/0/0/.../..          36 SSW   AERO 33 MPH SSW
4/10 65/41/53/+9/0.XX/0/.../..       37 SSW   AERO 35 MPH SSW 
4/11 44/33/39/-6/../../..            35 N     AERO 30 N
 
NEW DAILY RECORDS FOR APRIL 2009...
None to date..
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 12.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978
 
RECORDS FOR APRIL 13
HIGH 85 IN 1945
LOW 22 IN 1939
PRECIP 2.51 IN. IN 2004
SNOWFALL 6.8 IN. IN 1933
PEAK GUST 59 MPH SSW IN 1995
 
TODAY'S REPORT PREPARED BY: Andrew Hoell