BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 9, 2012  
ALL TIMES ARE IN EASTERN STANDARD TIME

MUCH COOLER AND DRIER WEATHER TODAY LIKELY TO END STREAK 
OF CONSECUTIVE WARMER THAN NORMAL DAYS...
A VERY PLEASANTLY WARM AND VERY DRY DAY TODAY 

After 11 consecutive warmer than normal days ending with yesterday, 
it appears today's average temperature will fall on either normal or
a degree cooler than normal. Our annual rainfall defecit also continues 
to grow, as we are once again nearing a rainfall deficit of 10 inches! 
By week's end, there is a good possibility we will reach that amount 
as there doesn't appear to be any significant rainfall for this week ahead.

After a slightly cooler than normal morning low of 61F, the high temp-
erature has reached the low 80's but with dew points in the upper 40's 
to around 50F the relative humidity is in the very comfortable 30% 
range and visibility is up to 75 to 80 miles.  

Today's observations:
 
7 A.M. 
Weather: Scattered dense cirrus, cirrus, (3 levels), line of clearing
extending WSW-overhead-ENE, sky clearing   
Temperature: 65F; Dew Point: 54F; Wind: NW at 7 kts,
Sea-level pressure: 29.95 in Hg, rising, then more rapidly 
Visibility: 80 miles, light distant haze
24-hour precip: 0.00
6-hour min. temp: 61F
BHO SA 1155 200 SCT 220 SCT E250 BKN 80 142/65/54/3207/995/ 
ACC DSNT ESE-SSW DNS CI OVHD-E-S SKY CLRG CLRG LINE OVHD XTDNG WSW-ENE 
CLR SKY W-NE/ 8/082 53016 10066 20061  

10 A.M. 
Weather: Scattered dense cirrus, thin scattered cirrus,
few small cumulus forming WSW-NNW, dense cirrus E-S-SW   
Temperature: 76F; Dew Point: 46F; Wind: NW at 10 kts,
Sea-level pressure: 29.95 in Hg, steady  
Visibility: 80 miles, light distant haze  
BHO SA 1455 220 SCT 250 –SCT 80 142/76/46/3210/995/ FEW SML CU FRMG
DSNT WSW-NNW DNS CI E-S-SW LGT DSNT HZ/ 8/102 55000

1 P.M.
Weather: Thin scattered cirrus, small shallow cumulus all quadrants
except distant NE-SE, dense cirrus distant ESE-SSW    
Temperature: 79F; Dew Point 48F; Wind: WNW at 7 kts,
Wind: Direction variable WSW-NNW
Sea-level pressure: 29.93 in. Hg, falling then more slowly 
Visibility: 75 miles, light distant haze
6-hour max temp.: 80F 
BHO SA 1755 250 –SCT 75 136/79/48/2907/993/ SML SHLW CU ALQDS XCPT 
DSNT NE-SE DNS CI DSNT ESE-SSW WND LGT DSNT HZ WND 24V33 8/102 56006 
10080 20065 

WEATHER SUMMARY FOR SUNDAY, JULY 8

TEMPERATURE (DEGREES F)
MAX.....87    NORMAL.....80
MIN.....66    NORMAL.....63
MEAN....77    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.......................+5
TOTAL DEPARTURE FOR THE MONTH......................+38 [+4.6 DEGREES/DAY]

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.............23 W   AT  3:20 P.M.
                   AERO..................23 W   AT  3:20 P.M. 
                   ASOS..................23 NNE AT 10:46 P.M. 
                   DAVIS.................22 W   AT  3:19 P.M. RMY 25 
THE FASTEST MILE FOR YESTERDAY...........14 WNW AT  3:21 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............17 WNW AT  3:20 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE...........16 W   AT  3:20 P.M. 
AVERAGE WIND SPEED AND DIRECTION........9.7 WNW
                   ASOS.................9.3
                   DAVIS................8.9 NW  [314 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..........0.38   DEPARTURE...........-0.50
                         ASOS..............0.36
TOTAL PRECIPITATION FOR THE YEAR..........18.07   DEPARTURE...........-9.78
                         ASOS.............17.98

PRELIMINARY CLIMATE SUMMARY FOR JULY 2012 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
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

7/1  89/67/78/+8/0.01/..../..       33 WSW AERO 32 MPH WSW RMY 34
7/2  84/66/75/+5/T/..../..          23 W   AERO 22 MPH W   RMY 23
7/3  85/63/74/+3/0.00/.../..        23 W   AERO 21 MPH W   RMY 20
7/4  85/66/76/+5/0.37/.../..        20 W   AERO 20 MPH W   RMY 23
7/5  81/68/75/+4/0.00/.../..        23 NW  AERO 23 MPH NW  RMY 22
7/6  86/64/75/+4/0.00/.../..        18 SSW AERO 18 MPH SSW RMY 19
7/7  81/69/75/+4/T/.../..           23 W   AERO 23 MPH W   RMY 24
7/8  87/66/77/+5/0.00/.../..        23 W   AERO 23 MPH W   RMY 25

7/9  morning low temp: 61F; the normal low is now 63F

DAILY RECORDS FOR JULY 2012
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: Robert Skilling/Patrick Peters 
 
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