BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 6, 2011  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY WARM, LOW HUMIDITY
Temperatures have reached as high as 87F and dew point temperatures have
dropped to 60F, thus comfortably low humidity today. Considerable cirrus
cloudiness moved in this afternoon, dimming the sun. Visibility reduced
to 30 miles due to distant haze. 
 
Today's observations:
 
7 A.M.  
Weather: High, thin broken cirrus
Temperature: 73F, Dew point: 60F; Wind: WSW at 5 kts,
Wind: Light
Sea-level pressure: 29.94 inches Hg, steady
Visibility: 25 miles, except 30 miles W, 20 miles NE, hazy all quadrants  
6-hour min. temp: 68F
BHO SA 1155 300 –BKN 25 139/73/60/2505/994/ FEW LWR CI VSBY NE 20 W 30
HAZY/ 8/001 51004 10073 20068
 
10 A.M.
Weather: Clear, distant cirrus S-W and N-NE
Temperature: 84F, Dew Point: 60F;  Wind: S at 9 kts
Wind: Variable SSE-SW
Sea-level pressure: 29.92 inches Hg, falling
Visibility: 25 miles, hazy
BHO SA 1455 CLR 25 132/84/60/1909/992/ CI DSNT S-W AND DSNT N-NE HAZY
WND 16V22/ 8/001 58007
 
1 P.M.
Weather: Broken dense cirrus, higher cirrus layer partly thin, cumulus,
few moderate cumulus W-NW
Temperature: 85F, Dew Point: 60F;  Wind: SW at 10 kts
Sea-level pressure: 29.90 inches Hg, falling
Visibility: 30 miles, distant haze
BHO SA 1755 E220 BKN 250 BKN 30 126/85/60/2210/990/ FEW MDT CU W-NW DNS
CI/CC ALQDS DSNT HZ/ 8/202 56007 10087 20073
 
WEATHER SUMMARY FOR TUESDAY, JULY 5
 
TEMPERATURE (DEGREES F)
MAX.....89    NORMAL.....80
MIN.....66    NORMAL.....61
MEAN....78    NORMAL.....71
 
DEPARTURE FROM 30-YEAR NORMAL....................+7
TOTAL DEPARTURE FOR THE MONTH...................+15 [+2.8 DEGREES/DAY]
 
HEATING DEGREE DAY SEASON IS COMPLETE 7/1/10 THRU 6/30/11
 
HEATING DEGREE DAYS (FINAL TOTALS FOR 2010-2011 SEASON)
TOTAL HEATING UNITS FOR JUNE.................86    DEPARTURE........+12
TOTAL HEATING UNITS FOR THE SEASON.........6239    DEPARTURE.......-132
TOTAL HEATING UNITS LAST SEASON TO DATE....5678    DIFFERENCE......+561
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............15 S   AT  6:14 P.M.
                   AEROVANE...............21 S   AT  6:15 P.M. 
                   ASOS...................17 S   AT  6:17 P.M.   
                   DAVIS..................20 WNW AT  1:11 A.M.
THE FASTEST MILE FOR YESTERDAY............13 S   AT  6:15 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE.............14 S   AT  6:35 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE............14 W   AT 11:42 P.M. 
AVERAGE WIND SPEED AND DIRECTION.........6.4 SSW
                   ASOS..................5.9  
                   DAVIS.................6.3 WSW [252 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE........-0.12
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR THE MONTH..........0.03  DEPARTURE........-0.59
                         ASOS..............0.03
TOTAL PRECIPITATION FOR THE YEAR..........27.34  DEPARTURE........+1.05
                        ASOS..............27.89**
**ASOS data is in error due to system failure on 1/12-13
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2011 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
 
7/1  78/59/69/-1/0.01/.../..         15 WNW
7/2  80/61/71/+1/0.00/.../..         17 SE
7/3  79/64/72/+2/0.02/.../..         22 S
7/4  86/68/76/+6/0.00/.../..         18 SW
7/5  89/66/78/+7/0.00/.../..         15 S
 
7/6  our morning low temp: 68F, normal low temp: 61F
 
DAILY RECORDS FOR JULY 2011
None so far...
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 6
HIGH 99F IN 2010
LOW 47F IN 1979
PRECIP 1.43 INCHES IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999
 
RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INCHES IN 1966
PEAK GUST 55 MPH NW IN 1989
 
TODAY'S REPORT PREPARED BY: Robert Skilling/Erin Abbott