BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 17, 2008
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED
 
Today's observations:
 
8 A.M. EDT
Weather: Clear, few distant cirrus E-S 
Temperature: 51F, Dew point: 17F  Wind: ESE at 4 kts
Wind: Light and variable
Sea-level pressure: 30.20 inches Hg, falling
Visibility: 70 miles
6-hour min temp: 42F
24-hour precipitation: none
BHO SA 1155 CLR 70 227/51/17/1204/020/ FEW DSNT CI E-S
THN K LYR N INVSN PRSNT WND L/V/ 8/001 58004 10051 20042
 
11 A.M. EDT
Weather: Clear, few distant cirrus E-S
Temperature: 62F, Dew point: 23F, Wind: NE at 8 kts
Wind: Variable direction NNW-E
Sea-level pressure: 30.19 inches Hg, falling
Visibility: 40 miles, light haze 
BHO SA 1455 CLR 40 225/62/23/0408/019/ FEW DSNT CI E-S
DRK K LYR W-N LGT HZ WND 34V10/ 8/001 58002
 
2 P.M. EDT
Weather: Clear, few altocumulus/ACSL, cirrus E-S
Temperature: 60F, Dew point: 20F, Wind: NE at 13 kts
Wind: Variable direction N-E
Sea-level pressure: 30.14 inches Hg, falling
Visibility: 45 miles, light haze    
6-hourly max.temp: 64F 
BHO SA 1755 CLR 45 207/60/20/0413/014/ FEW AC/ACSL DSNT E-S
FEW CI E-S K LYR W-N LGT HZ WND 36V08/ 8/041 56018 10064 20051
 
WEATHER SUMMARY FOR WEDNESDAY, APRIL 16
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....56
MIN.....39    NORMAL.....37
MEAN....52    NORMAL.....46
DEPARTURE FROM 30-YEAR NORMAL...........+6
TOTAL DEPARTURE FOR THE MONTH..........+18 [+0.9 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............13  DEPARTURE....... -6
TOTAL HEATING UNITS FOR THE MONTH...........321  DEPARTURE.......-18
TOTAL HEATING UNITS FOR THE SEASON.........5458  DEPARTURE......-345
TOTAL HEATING UNITS LAST SEASON TO DATE....5427  DIFFERENCE......+31 
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............24 SSE  AT  7:27 P.M.  
                   AEROVANE.............23 SSE  AT  7:32 P.M. *  
                   ASOS.................23 S    AT  7:27 P.M.   
                   DAVIS................24 ESE  AT  6:02 P.M.    
FASTEST MILE FOR YESTERDAY............. 17 SSE  AT  7:16 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 S    AT  7:50 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 SSE  AT  7:17 P.M.   
AVERAGE WIND SPEED AND DIRECTION...... 8.0 WNW
                   ASOS................7.5   
                   DAVIS...............8.1 S  [170 deg] 
* Last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE......-0.15 
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.52   DEPARTURE......-0.88
                         ASOS..............1.66
TOTAL PRECIPITATION FOR THE YEAR..........19.12   DEPARTURE......+3.09
                         ASOS.............21.54 #
# Includes erroneous ASOS precipitation data on 2/13/08.
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0    DEPARTURE......-0.1
TOTAL SNOWFALL FOR APRIL...................0.0    DEPARTURE......-1.7
TOTAL SNOWFALL FOR THE SEASON.............66.5    DEPARTURE......+7.8
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available, records not finalized
 
4/1  59/50/55/+14/0.20/0/000/00    54 S    Aero 58 MPH SSW
4/2  47/31/39/-3/0/0/745/97        52 W    Aero 51 MPH W
4/3  52/27/40/-2/0/0/648/84        37 SSW
4/4  43/34/39/-3/0.71/0/000/00     35 E
4/5  51/37/44/+1/0.06/0/093/12     21 W
4/6  40/36/38/-5/0.09/0/000/00     36 NE
4/7  39/34/37/-6/0/0/172/22        35 NE    Aero 36 MPH NE
4/8  47/30/39/-5/0/0/627/80        22 NE
4/9  59/33/47/+3/0/0/150/19        29 S   
4/10 71/44/58/+14/T/0/624/79       34 W
4/11 54/40/47/+2/0.03/096/13       24 SE
4/12 70/43/57/+12/0.43/0/342/43    40 WNW   Aero 42 WNW
4/13 47/34/41/-4/T/0/104/13        30 NW
4/14 53/30/42/-4/0/0/625/78        29 NW 
4/15 57/33/45/-1/0/0/803/100       23 SSE
4/16 64/39/52/+6/0/0/806/100       24 SSE
 
4/17 morning low temp. 42F; our normal low is now 38F
 
NEW DAILY RECORDS FOR APRIL 2008
None to date.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW 21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 58 MPH NW IN 1994
 
RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 3.7 IN. IN 1965
PEAK GUST 59 MPH S IN 1982
 
TODAY'S REPORT PREPARED By: Stephanie Radner