BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 24, 2009   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
PRECIPITATION TOTAL 2.20 INCHES
ANOTHER DAY WITHOUT SUNSHINE AND
VERY COOL AGAIN WITH A HIGH OF
59F EARLY THIS AFTERNOON 
 
Precipitation which began early last Sunday
morning, June 21, has totaled 2.20 inches as
of 8 a.m. this morning. This has included
an additional amount of 0.39 inch during the
past 24 hours and included lots of drizzle
and some moderate showers yesterday
during the afternoon. 
 
There has been no sunshine since last Saturday,
June 21, when there was 29% of possible. This
means there has been sunshine on only one out
of the past six days and out of seven days if
today remains overcast.
 
The monthly sunshine percent will drop to 28%
including today if there is none again today.
The unreachable record low for June is 25%
in 1903 but we could wind up with the 2nd least
sunshine for June (June, 1998, had 36%) even
if we get 50% of the possible sunshine during
the last days of the month.
 
Today's observations:
 
7 A.M.  
Weather: Obscurement with heavy fog, light drizzle 
Temperature: 56F, Dew point: 56F, Wind: N at 8 kts,
Wind: Direction variable NW to NNE 
Sea-level pressure: 29.76 inches Hg, rising
Visibility: 8 miles, 15 miles north thru northeast
6-hour minimum temp: 55F
6-hour rainfall: 0.07 in. 
24-hour rainfall: 0.39 inch
BHO SA 1155 W3 X 1/16L-F 078/56/56/3508/976/
WND 32V03/ 8//// 53010 MANUAL 6007/ ASOS 60006
ASOS 70036 MANUAL 70039 10056 20055
 
10 A.M.  
Weather: Obscurement with heavy fog and light drizzle
Temperature: 57F, Dew point: 57F, Wind: N at 14G22 kts,
Wind: Direction variability from NNW to NE
Sea-level pressure: 29.78 inches Hg, rising
Visibility: 1/16 mile, very light drizzle, heavy fog 
3-hour precipitation: 0.03 inch
BHO SA 1455 W2 X 1/16L-F 085/57/57/0114G22/978/ SKY BRIGHTER
PCPN VRY LGT WND 33V04/ 8//// 51007 MANUAL 6003/ ASOS 60002
 
1 P.M.  
Weather: Obscurement with heavy fog and light drizzle
Temperature: 58F, Dew point: 58F, Wind: N at 10 kts,
Wind: Direction variability from NNW to NE
Sea-level pressure: 29.81 inches Hg, rising
Visibility: 1/16, light drizzle and heavy fog 
6-hour precipitation: 0.04 inch 
BHO SA 1755 W2 X 1/16L-F 095/58/58/0110/981/ SKY BRIGHTER
WND 34V05/ 8//// 53010 MANUAL 6004/ ASOS 60003 10059 20056
 
WEATHER SUMMARY FOR TUESDAY, JUNE 23
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....77
MIN.....57    NORMAL.....58
MEAN....61    NORMAL.....68
 
DEPARTURE FROM 30-YEAR NORMAL...........-7
TOTAL DEPARTURE FOR THE MONTH..........-91 [-4.2 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............4  DEPARTURE.......+3
TOTAL HEATING UNITS FOR THE MONTH...........104  DEPARTURE......+37
TOTAL HEATING UNITS FOR THE SEASON.........6225  DEPARTURE.....-139
TOTAL HEATING UNITS LAST SEASON TO DATE....5942  DIFFERENCE....+283
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............38 N   AT 12:07 A.M.
                   AEROVANE..............33 N   AT 12:07 A.M.  
                   ASOS..................35 N   AT 12:07 A.M.   
                   DAVIS.................35 N   AT 12:06 A.M.    
FASTEST MILE FOR YESTERDAY...............19 NNW AT 11:29 P.M. *  
MAXIMUM 2-MINUTE ASOS AVERAGE............21 N   AT  1:49 A.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........22 N   AT 12:08 A.M.   
AVERAGE WIND SPEED AND DIRECTION.......11.1 N
                   ASOS................10.7
                   DAVIS...............10.8 N  [350 DEG]
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.39  DEPARTURE....+0.26
                         ASOS..............0.36
TOTAL PRECIPITATION FOR  JUNE..............4.27  DEPARTURE....+1.25
                         ASOS..............4.26 
TOTAL PRECIPITATION FOR THE YEAR..........22.77  DEPARTURE....-1.99
                         ASOS.............23.81 
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
6/1  69/41/55/-7/0/706/78          29 SSW    AERO 25 MPH SSW
6/2  76/53/65/+3/T/525/58          28 S      AERO 24 MPH S
6/3  69/54/62/0/T/254/28           23 SSW    
6/4  73/53/63/0/0/327/36           22 SSE    
6/5  64/51/58/-5/0.05/000/00       21 NE
6/6  73/51/62/-1/0.01/428/47       25 SSE
6/7  79/56/68/+4/0/583/64          28 W      AERO 24 MPH W
6/8  73/57/65/+1/0/529/58          18 ENE
6/9  59/51/55/-9/0.10/000/00       27 E
6/10 59/52/56/-8/0.00/000/00       21 NE    
6/11 57/52/55/-10/0.17/000/00      23 NNE    AERO 21 MPH NE
6/12 70/53/62/-3/0.43/119/13       30 SSE    AERO 29 MPH SSE
6/13 75/59/67/+2/T/796/87          23 NNE
6/14 63/54/59/-6/0.34/101/11       20 E
6/15 60/52/56/-10/0.06/027/03      20 NE
6/16 64/51/58/-8/T/568/62          22 NNE  
6/17 74/50/62/-4/0/807/88          28 S      AERO 24 MPH S
6/18 65/52/59/-7/.../000/00        35 ESE
6/19 70/61/66/-1/.../000/00        33 SE     AERO 31 MPH SE
6/20 76/60/68/+1/.../266/29        21 NNE
6/21 61/57/59/-8/.../000/00        44 N      AERO 42 MPH N
6/22 60/58/59/-8/.../000/00        42 NNE    AERO 39 MPH NNE 
6/23 64/57/61/-7/.../000/00        38 N      AERO 33 MPH N
 
6/24 our morning low temp: 55F; the normal low is now 58F 
 
NEW DAILY RECORDS FOR JUNE 2009 TO DATE...
NONE
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 24
HIGH 91F IN 1914,1976
LOW 40F IN 1932
PRECIP 2.80 INS IN 1929
PEAK GUST 46 MPH S IN 1985
 
RECORDS FOR JUNE 25
HIGH 93F IN 1943,1980, 2005
LOW 47F IN 1903
PRECIP 1.10 INS IN 2006
PEAK GUST 51 MPH W IN 1960
 
TODAY'S REPORT PREPARED BY: Robert Skilling