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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 9, 2011   
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY SUNNY WITH DRIER AIR REPLACING HIGH DEW POINTS 
OF THE LAST FEW DAYS...
Additional rainfall Friday evening and overnight brought
the storm total from early Friday through early Saturday
morning up to 0.58 inch. Stratus were slow to clear this
morning with the dew point holding in the upper 60s, but
by mid-day the sky had turned mostly sunny.  Increasing
NW winds are bringing in drier air, and the dew point has
dropped to the middle 50s by early afternoon as the 
visibility has climbed to more than 60 miles. 

 
Today's observations: 

7 A.M.   
Weather: Overcast stratus, fog, stratus fractus drifting
below the summit, thin spots in overcast overhead to W
Temperature: 67F, Dew point: 67F; Wind: NW at 8 kts
Sea-level pressure: 29.74 inches Hg, rising 
Visibility: 3 miles, 1 mile N-NE, 10 miles SE 
6-hour min. temp: 66F 
6-hour precip: N/A
24-hour precip: 0.46 inch
BHO SA 1155 E3 OVC 3F 070/67/67/3108/974/ STFRA DRFTG BLO SMT 
THN SPTS IOVC OVHD-W VSBY N-NE 1 SE 10/ 8/6// 53007 600// 
70046 10068 20066

10 A.M. 
Weather: Scattered cumulus, scattered altocumulus, few 
cumulus fractus, hazy
Temperature: 75F, Dew Point: 67F;  Wind: WNW at 10 kts 
Wind: Direction variable W to NNW
Sea-level pressure: 29.78 inches Hg, rising
Visibility: 35 miles
BHO SA 1455 25 SCT 100 SCT 35 083/75/67/3010/978/ FEW CUFRA 
HAZY WND 26V34/ 8/130 53013 

1 P.M. 
Weather: Scattered cumulus, few higher cumulus,
light haze
Temperature: 80F, Dew Point: 57F;  Wind: WNW at 14G22 kts
Wind: Direction variable W to NW
Sea-level pressure: 29.81 inches Hg, rising 
Visibility: 60 miles, 70 miles NW
6-hour max. temp: 80F 
BHO SA 1755 45 SCT 60 096/80/57/2914G22/981/ FEW HIR CU 
VSBY NW 70 LGT HZ WND 26V32/ 8/100 51013 10080 20067


WEATHER SUMMARY FOR FRIDAY, JULY 8

TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....81
MIN.....65    NORMAL.....61
MEAN....70    NORMAL.....71

DEPARTURE FROM 30-YEAR NORMAL....................-1 
TOTAL DEPARTURE FOR THE MONTH...................+27 [+3.2 DEGREES/DAY]

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............16 ESE AT 10:07 A.M. 
                   AEROVANE...............21 ESE AT 10:07 A.M. 
                   ASOS...................17 ESE AT 10:14 A.M. 
                   DAVIS..................18 ESE AT 10:07 A.M. 
THE FASTEST MILE FOR YESTERDAY............14 ESE AT 10:06 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE.............14 SE  AT 10:10 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE............14 ESE AT 10:09 A.M. 
AVERAGE WIND SPEED AND DIRECTION.........6.5 ESE
                   ASOS..................4.7 
                   DAVIS.................5.5 ESE [101 deg]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.46  DEPARTURE.........+0.34
                         ASOS..............0.44   
TOTAL PRECIPITATION FOR THE MONTH..........0.61  DEPARTURE.........-0.37
                         ASOS..............0.61
TOTAL PRECIPITATION FOR THE YEAR..........27.92  DEPARTURE.........+1.27
                        ASOS..............28.47**
**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  88/68/78/+7/T/.../..            30 WNW AERO 35 MPH WNW TSTM 
7/7  86/67/77/+6/0.00/.../..         17 WNW
7/8  74/65/70/-1/.../.../..          16 ESE TSTM

7/9  morning low temp: 66F; the normal low is now 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 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992 

RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.68 INS IN 1933
WIND 75 MPH W IN 1985

TODAY'S REPORT PREPARED BY: Mike Iacono