BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 23, 2009   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
JUNE SUNSHINE DROPS TO 30% OF POSSIBLE
AFTER ANOTHER OVERCAST GLOOMY JUNE DAY
 
Yesterday brought more low clouds, rain and drizzle and
continued very cool temperatures. There have really
only been two days this month so far with 80% or more
of the possible bright sunshine.  A third day might
qualify as a mostly sunny day with 78%. 
1. June 1 ....78%
2. June 13....87%
3. June 17....88%
Today would make 12 days this June which can be
classified as cloudy out of the 23 days to date.
 
The rainfall total since Sunday had reached 1.81 inches as of
8 a.m. this morning. 
 
Today's observations:
 
7 A.M.  
Weather: Low overcast stratus, very light drizzle 
Temperature: 59F, Dew point: 58F, Wind: N at 9 kts,
Wind: Gust to 22 kts past hour,
Wind: Direction variable NNW to NE 
Sea-level pressure: 29.69 inches Hg, rising
Visibility: 8 miles, 15 miles north thru northeast
6-hour minimum temp: 59F
6-hour rainfall: trace
24-hour rainfall: 0.59 inch
BHO SA 1155 E9 OVC 8L- 055/59/58/3609/969/
VSBY N-NE 15 LB50 PCPN VRY LGT/ 8/6// 53007
MANUAL 6000/ 70059 10060 20059 
 
10 A.M.  
Weather: Low overcast of stratus fractus and
nimbostratus, light drizzle and fog
Temperature: 59F, Dew point: 59F, Wind: N at 10 kts,
Sea-level pressure: 29.72 inches Hg, rising
Visibility: 4 miles 
3-hour precipitation: 0.03 inch
BHO SA 1455 E3 BKN 8 OVC 4L-F 066/59/59/3610/972/
8/82/ 53011 ASOS 60003 MANUAL 6003/
 
WEATHER SUMMARY FOR MONDAY, JUNE 22
 
TEMPERATURE (DEGREES F)
MAX.....60    NORMAL.....77
MIN.....58    NORMAL.....58
MEAN....59    NORMAL.....67
 
DEPARTURE FROM 30-YEAR NORMAL...........-8
TOTAL DEPARTURE FOR THE MONTH..........-84 [-4.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............6  DEPARTURE.......+4
TOTAL HEATING UNITS FOR THE MONTH...........100  DEPARTURE......+34
TOTAL HEATING UNITS FOR THE SEASON.........6221  DEPARTURE.....-142
TOTAL HEATING UNITS LAST SEASON TO DATE....5942  DIFFERENCE....+279
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............42 NNE AT  1:53 P.M. *
                   AEROVANE..............39 NNE AT  1:53 P.M. * 
                   ASOS..................40 NNE AT  1:54 P.M.  
                   DAVIS.................45 N   AT  8:39 A.M.   
FASTEST MILE FOR YESTERDAY...............25 N   AT  1:21 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............25 N   AT  1:22 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........29 N   AT 11:46 A.M.  
AVERAGE WIND SPEED AND DIRECTION........16.6 N   
                   ASOS.................16.3
                   DAVIS................15.6 N [360 DEG]
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.59  DEPARTURE....+0.46
                         ASOS..............0.58
TOTAL PRECIPITATION FOR  JUNE..............3.88  DEPARTURE....+0.99
                         ASOS..............3.90 
TOTAL PRECIPITATION FOR THE YEAR..........22.38  DEPARTURE....-2.25
                         ASOS.............23.45 
 
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 our morning low temp: 59F; the normal low temp. is now 58F
 
NEW DAILY RECORDS FOR JUNE 2009 TO DATE...
New daily rainfall for 6/22, amount not yet available
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 23
HIGH 93F IN 1888
LOW 45F IN 1885
PRECIP 0.70 INS IN 2006
PEAK GUST 63 MPH SE IN 1972 (AGNES)
 
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
 
TODAY'S REPORT PREPARED BY: Robert Skilling