BLUE HILL METEOROLOGICAL OBSERVATORY  
MILTON, MASSACHUSETTS 
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JUNE 11, 2011 
ALL TIMES ARE IN EASTERN STANDARD TIME 

MUCH COOLER AND DAMP TODAY WITH LIGHT TO MODERATE RAIN...
There has been no sunshine so far today and the temperature
has remained in the upper 50s for the most part so far today.
The high temperature has been just 60 degrees in the early 
hours of the day.  Rain showers began before sunrise and 
have continued much of the morning, with a period of steady
rain at mid-day that became moderate rain for a time just
after noon EDT.  A total of 0.01 inch of rain was measured 
through 8 AM EDT this morning with an additional 0.15 falling 
in the six hours ending at 2 PM EDT.  The visibility briefly
dropped to 1/4 mile in dense fog as the ceiling lowered while
the steady rain was ending just after noon EDT.  As of 2 PM
EDT, visibility has increased to 15 miles, though it is
highly variable as dissipating low stratus clouds drift by 
just over the summit. 

Today's observations: 

7 A.M.   
Weather: Light rain, broken stratocumulus, overcast nimbostratus, 
higher clouds visible distant E-ESE
Temperature: 57F, Dew point: 57F; Wind: E at 7 kts
Sea-level pressure: 30.15 inches Hg, rising
Visibility: 20 miles, 
6-hour min. temp: 57F
6-hour precip.: 0.01 in.
24-hour precip.: 0.01 in. 
BHO SA 1155 E45 BKN 55 OVC 20R- 209/57/57/0807/015/ HIER CLDS 
VSBL DSNT E-ESE WND LGT/ 8/52/ 51017 6001/ 70001 10060 20057
 
10 A.M.
Weather: Light rain shower, broken stratocumulus, overcast
nimbostratus, few cumulus fractus all quadrants, precipitation
very light
Temperature: 58F, Dew point: 55F; Wind: E at 10 kts,
Sea-level pressure: 30.14 inches Hg, falling
Visibility: 25 miles, visibility WNW-NW 15 miles, SSE-S 40 miles 
3-hour precip.: 0.02 inch
BHO SA 1455 E40 BKN 55 BKN 100 OVC 25RW- 206/58/55/0910/014/ FEW 
CUFRA ALQDS VSBY WNW-NW 15 SSE-S 40 PCPN VRY LGT RW-B00E35RW-B50/ 
8/52/ 58003 6002/   

1 P.M.
Weather: Light rain, scattered stratus/stratus fractus, broken
stratocumulus, overcast nimbostratus, few stratus fractus below
summit WNW-NE, higher clouds visible distant ESE, precipitation
very light
Temperature: 56F, Dew point: 56F; Wind: ENE at 10G18 kts,  
Sea-level pressure: 30.13 inches Hg, falling
Visibility: 15 miles, NNW-NE 8 miles, ESE-SE 30 miles   
6-hour max. temp: 58F   
6-hour precip.: 0.15 inch
BHO SA 1755 3 SCT 20 SCT E40 BKN 50 OVC 15R- 204/56/56/0710G18/013/ 
FEW STFRA BLO SMT WNW-NE HIER CLDS VSBL DSNT ESE VSBY NNW-NE 8 
ESE-SW 30 PCPN VRY LGT/ 8/52/ 58002 6015/ 10058 20056
 
WEATHER SUMMARY FOR FRIDAY, JUNE 10 

TEMPERATURE (DEGREES F)
MAX.....74     NORMAL.....74   
MIN.....60     NORMAL.....54
MEAN....67     NORMAL.....64

DEPARTURE FROM 30-YEAR NORMAL...................+3
TOTAL DEPARTURE FOR THE MONTH..................+31 [+2.9 DEGREES/DAY] 
 
HEATING DEGREE DAYS	
TOTAL HEATING UNITS FOR YESTERDAY.............0    DEPARTURE.........-3
TOTAL HEATING UNITS FOR THE MONTH............26    DEPARTURE........-13
TOTAL HEATING UNITS FOR THE SEASON.........6179    DEPARTURE.......-157 
TOTAL HEATING UNITS LAST SEASON TO DATE....5665    DIFFERENCE......+514

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............21 W   AT  2:05 P.M.  
                   AEROVANE...............22 WSW AT 12:15 A.M.   
                   ASOS...................20 ENE AT  1:51 P.M.  
                   DAVIS..................21 W   AT  2:48 A.M.   
THE FASTEST MILE FOR YESTERDAY............14 NE  AT  2:08 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE.............15 E   AT  2:10 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE............16 W   AT  2:49 P.M.    
AVERAGE WIND SPEED AND DIRECTION........10.1 NE   
                   ASOS..................8.7     
                   DAVIS.................9.7 N [007 deg]
* Last of several occurrences. 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE........-0.12
                         ASOS..............0.01   
TOTAL PRECIPITATION FOR THE MONTH..........1.49  DEPARTURE........+0.19  
                         ASOS..............1.46
TOTAL PRECIPITATION FOR THE YEAR..........23.68  DEPARTURE........+0.64
                        ASOS..............24.28**
**ASOS data is in error due to system failure on 1/12-13    

PRELIMINARY CLIMATE SUMMARY FOR JUNE 2011 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  80/60/70/+8/0.64/425/47         39 S    AERO 44 MPH S TSTM
6/2  72/52/62/0/0.00/697/77          50 WSW  AERO 54 MPH WSW
6/3  69/48/59/-3/0.00/870/96         36 W    AERO 39 MPH WNW
6/4  64/46/55/-8/0.00/881/97         27 NE   
6/5  70/46/58/-5/0.00/854/94         20 N 
6/6  75/54/65/+2/0.00/801/88         17 SSE
6/7  85/59/72/+8/0.00/865/95         22 NW 
6/8  90/64/77/+13/0.00/756/83        32 SW   TSTM (no rain)
6/9  88/65/77/+13/.../.../..         57 W    AERO 60 MPH W TSTM
6/10 74/60/67/+3/0.00/.../..         21 W

6/11 morning low temp: 56F; the normal low temp: 55F   

DAILY RECORDS FOR JUNE 2011
None so far...

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JUNE 11
HIGH 92F IN 1973,1984,1997
LOW 40F IN 1972
PRECIP 2.66 INS 1922
PEAK GUST 43e MPH S IN 1945

RECORDS FOR JUNE 12
HIGH 92F IN 1973
LOW 40F IN 1906
PRECIP 1.79 INS 1955
PEAK GUST 58 MPH NW IN 1991

TODAY'S REPORT PREPARED BY: Mike Iacono