BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 13, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Overcast 
Temperature: 33F, Dew point: 32F, Wind: WSW at 9 kts 
Sea-level pressure: 29.68 inches Hg, rising
Visibility: 60 miles 
6-hour min. temp: 31F
24-hour precip: 0.89 ins.
24-hour snowfall: trace
BHO SA 1155 E65 OVC 60 052/33/32/2409/968/ HIER CLDS VSB/ 
8/5// 52005 MANUAL 70089 ASOS 70087 10033 20031
 
10 A.M.
Weather: Overcast
Temperature: 42F, Dew point: 34F, Wind: W at 18G27 kts
Wind: Peak wind last hour 29 kts W at 9:24 A.M.  
Sea-level pressure: 29.68 inches of Hg, steady 
Visibility: 75 miles
BHO SA 1455 E25 BKN 50 OVC 75 052/42/34/2718G27/968/ BINOVC N 
PK WND 2829/24/ 8/5// 55000
 
1 P.M.
Weather: Overcast
Temperature: 43F, Dew point: 32F, Wind: W @ 18G26 kts
Wind: Peak wind last hour 32 kts W at 12:34 P.M.
Sea-level pressure: 29.69 inches of Hg, rising 
Visibility: 65 miles   
BHO SA 1755 E25 BKN 50 OVC 65 055/43/32/2718G26/969/ 
PK WND 2832/34/ 8/5// 53002 10044 20033
 

WEATHER SUMMARY FOR THURSDAY, APRIL 12
 
TEMPERATURE (DEGREES F)
MAX.....39    NORMAL.....54 
MIN.....32    NORMAL.....36
MEAN....36    NORMAL.....45
DEPARTURE FROM 30-YEAR NORMAL..........- 9
TOTAL DEPARTURE FOR THE MONTH..........-79 (-6.8 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY..........29   DEPARTURE........+ 9
TOTAL HEATING UNITS FOR THE MONTH.........341   DEPARTURE........+79 
TOTAL HEATING UNITS FOR THE SEASON.......5335   DEPARTURE.......-391
TOTAL HEATING UNITS LAST SEASON TO DATE..5171   DIFFERENCE......+164
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............42 E   AT 12:20 P.M.  
                   AEROVANE............ 40 E   AT 11:49 A.M. 
                   ASOS.................40 E   AT 11:49 A.M. 
                   DAVIS................39 ENE AT 12:15 P.M. 
FASTEST MILE FOR YESTERDAY..............32 E   AT 11:49 A.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE...........31 E   AT 11:50 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........29 E   AT 11:50 A.M. 
AVERAGE WIND SPEED AND DIRECTION......15.5 E
                    ASOS..............15.2  
                    DAVIS.............14.9 ENE [72 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.89  DEPARTURE.....+0.74
                         ASOS..............0.87
TOTAL PRECIPITATION FOR THE MONTH..........2.79  DEPARTURE.....+0.99  
                         ASOS..............2.66    
TOTAL PRECIPITATION FOR THE YEAR..........14.53  DEPARTURE.....-0.90
                         ASOS.............14.30   
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........trace  DEPARTURE......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.2  DEPARTURE......-1.1 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-30.6  
    
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 39/32/36/-9/0.89/T/000/00       42 E       Aero 40 MPH E
 
4/13 morning low temp. 31 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 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
 
RECORDS FOR APRIL 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 2.22 IN. IN 1895
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943
 
TODAY'S REPORT By: Stephanie Radner