BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 4, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME 
 
Today's Observations:
 
7 A.M.
Weather: Overcast
Temperature: 47F, Dew point: 40F, Wind: WSW at 17G23 kt
Sea-level pressure: 29.28 inches Hg, rising
Visibility: 80 miles prevailing, 30 miles S
6-hour minimum temperature: 47F
24-hour precipitation: 0.70 inch
BHO SA 1155 35 BKN 45 OVC 80 915/47/40/2517G23/928/
FEW BINOVC DSNT NW AND E-SE VIRGA SE-S VSBY S 30/
8/2// 53026 70070 10051 20047
 
10 A.M.
Weather: Overcast with a rain shower
Temperature: 46F, Dew point: 38F, Wind: WSW at 24G33 kt
Sea-level pressure: 29.30 inches Hg, rising
Visibility: 70 miles
BHO SA 1455 35 BKN 45 OVC 70RW 921/46/38/2424G33/930/
FEW BINOVC ALQDS RB50 PK WND 2333/1453/ 8/2// 50006 6000/
 
1 P.M.  
Weather: Overcast
Temperature: 46F, Dew point: 32F, Wind: WSW at 28G41 kt
Sea-level pressure: 29.31 inches Hg, rising
Visibility: 70 miles
6-hour maximum temperature: 50F
6-hour precipitation: Trace
BHO SA 1755 45 OVC 65 924/46/32/2528G41/931/
FEW BINOVC N PK WND 2541/1752/ 8/5// 53003 6000/ 10050 20046
 
WEATHER SUMMARY FOR FRIDAY, APRIL 3, 2009
 
TEMPERATURE (DEGREES F)
MAX.....58    NORMAL.....51
MIN.....45    NORMAL.....33
MEAN....52    NORMAL.....42
 
DEPARTURE FROM 30-YEAR NORMAL.................+10
TOTAL DEPARTURE FOR THE MONTH.................+11  [+3.5 DEGREE/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............13  DEPARTURE........-10
TOTAL HEATING UNITS FOR THE MONTH.............59  DEPARTURE........-11
TOTAL HEATING UNITS FOR THE SEASON..........5477  DEPARTURE........-57
TOTAL HEATING UNITS LAST SEASON TO DATE.....5198  DIFFERENCE......+279
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............39 SSE AT 6:10 P.M.
                   AEROVANE.............38 SSE AT 5:25 P.M.
                   ASOS.................37 S   AT 6:11 P.M.
                   DAVIS................38 SSE AT 6:10 P.M.
FASTEST MILE FOR YESTERDAY..............31 SSE AT 5:25 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........28 S   AT 5:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........28 SSE AT 5:26 P.M.
                   AVERAGE............14.7 ENE
                   ASOS...............13.8
                   DAVIS..............14.5 ESE  [112 DEGREES]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.70 DEPARTURE.........+0.55
                         ASOS...............0.76
TOTAL PRECIPITATION FOR THE MONTH...........0.85 DEPARTURE.........+0.40
                         ASOS...............0.90
TOTAL PRECIPITATION FOR THE YEAR...........10.93 DEPARTURE.........-3.15
                         ASOS..............12.03 #
# 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..........0.0   DEPARTURE.........-0.1
TOTAL SNOWFALL FOR THE MONTH................0.0   DEPARTURE.........-0.4
TOTAL SNOWFALL FOR THE SEASON..............78.7   DEPARTURE........+21.4
 
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/.../..       24 SE    AERO 22 MPH SE
4/2  52/39/46/+4/0.02/0/.../..       20 SSE   AERO 17 MPH SSE
4/3  58/45/52/+10/.../0/.../..       39 SSE   AERO 38 MPH SSE
 
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 4
HIGH 71 IN 1950
LOW 12 IN 1954
PRECIP 1.45 IN. IN 1987
SNOWFALL 3.7 IN. IN 1975
PEAK GUST 80 MPH WNW IN 1963
 
RECORDS FOR APRIL 5
HIGH 81 IN 1928
LOW 15 IN 1995
PRECIP 2.15 IN. IN 1987
SNOWFALL 4.0 IN. IN 1898
PEAK GUST 76 MPH WNW IN 1963
 
TODAY'S REPORT PREPARED BY: Andrew Hoell