BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 12, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Overcast 
Temperature: 37F, Dew point: 33F, Wind: E at 11 kts 
Sea-level pressure: 30.10 inches Hg, falling
Visibility: 25 miles 
6-hour min. temp: 35F
6-hour precip: trace
BHO SA 1155 E75 OVC 25 192/37/33/0911/010/ FEW CUFRA N-NE RBE UKN/ 
8/77/ 58005 MANUAL 6000/ 10037 20035
 
10 A.M.
Weather: Overcast, rain and ice pellets
Temperature: 38F, Dew point: 30F, Wind: E at 20G29 kts
Wind: Peak wind last hour 29 kts E at 9:54 A.M.  
Sea-level pressure: 30.01 inches of Hg, falling 
Visibility: 15 miles
3-hour precip: trace
BHO SA 1455 E70 OVC 15R-IP- 164/38/30/1020G29/001/ FEW STFRA N-E 
PK WND 1029/54 RB UKN IPB UKN/ 8/72/ 58028 MANUAL 6000/
 
1 P.M.
Weather: Overcast, rain
Temperature: 36F, Dew point: 34F, Wind: E @ 19G33 kts
Wind: Peak wind last hour 36 kts E at 12:55 P.M.
Sea-level pressure: 29.88 inches of Hg, falling 
Visibility: 4 miles, rain and fog   
6-hour max. temp. 39 deg.
6-hour precip: 0.06 ins.  
BHO SA 1755 20 SCT E30 OVC 4RF 117/36/34/0919G33/988/ PK WND 1036/20/ 
8/72/ 56047 MANUAL 6006/ ASOS 60004 10039 20036
 
WEATHER SUMMARY FOR WEDNESDAY, APRIL 11
 
TEMPERATURE (DEGREES F)
MAX.....51    NORMAL.....54 
MIN.....28    NORMAL.....36
MEAN....40    NORMAL.....45
DEPARTURE FROM 30-YEAR NORMAL..........- 5
TOTAL DEPARTURE FOR THE MONTH..........-70 (-6.6 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........25   DEPARTURE........+ 5
TOTAL HEATING UNITS FOR THE MONTH.........312   DEPARTURE........+70 
TOTAL HEATING UNITS FOR THE SEASON.......5306   DEPARTURE.......-400
TOTAL HEATING UNITS LAST SEASON TO DATE..5160   DIFFERENCE......+146
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............22 SSE AT 5:01 P.M. * 
                   AEROVANE............ 21 SSE AT 5:06 P.M. 
                   ASOS.................22 SE  AT 5:02 P.M. 
                   DAVIS................22 SE  AT 5:02 P.M. 
FASTEST MILE FOR YESTERDAY..............15 SSE AT 5:05 P.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 SE  AT 5:06 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........17 SE  AT 5:06 P.M. 
AVERAGE WIND SPEED AND DIRECTION......8.8 WNW
                    ASOS..............9.6  
                    DAVIS.............9.0 WSW [248 deg]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace  DEPARTURE.....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.90  DEPARTURE.....+0.25  
                         ASOS..............1.79    
TOTAL PRECIPITATION FOR THE YEAR..........13.64  DEPARTURE.....-1.64
                         ASOS.............13.43   
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.2  DEPARTURE......-1.0 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-30.5  
    
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
 
4/1  59/33/46/+5/0.42/0/511/67       30 S
4/2  39/35/37/-5/0.33/0/000/00       27 E
4/3  41/32/37/-5/0.04/0/000/00       28 ENE
4/4  36/32/34/-8/0.90/0.2/000/00     38 E
4/5  43/26/35/-8/0.21/T/163/21       36 WSW
4/6  39/23/31/-12/0/0/590/76         36 WSW
4/7  40/26/33/-10/0/0/405/52         35 W
4/8  40/25/33/-11/0/0/619/79         44 W   
4/9  50/30/40/-4/0/0/746/95          36 W
4/10 43/30/37/-7/0/0/158/20          28 W 
4/11 51/28/40/-5/0/0/.../..          22 SSE
 
4/12 morning low temp. 35 deg; normal low now 36 deg.   
 
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 By: Stephanie Radner