BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 28, 2011  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM AND DRY CONDITIONS CONTINUE AT THE SUMMIT TODAY
JULY RAINFALL AMOUNTS STILL BELOW NORMAL
JULY SUNSHINE ABOVE NORMAL
 
This year's July is tied for the 3rd warmest July through 27 days
at 74.1 (1994)(entire month). July continues to be a dry month with 
rainfall amounts -1.02 inch lower than normal. Sunshine is above
normal by 7%.
 
Our sunny July continues, with temperatures gradually increasing
throughout the day. Our recorded high temperature at 1:00 EDT was 80F,
with lower elevations seeing temperatures in the low 80s. Dew points
have remained in the high 50s and low 60s, as we are still under the
influence of an exiting high pressure system, which will be followed by
a warm front tonight.
 
Below is the listing of our warmest Julys: 
Warmest July Corrected Mean Temperature (deg F)
(also warmest for all months of the year)
1) 75.1 in 2010
2) 74.9 in 1952
3) 74.1 in 1994
4) 73.8 in 1999
5) 73.5 in 1949
 
Today's observations:
 
7 A.M.  
Weather: Clear, cirrus/cirrostratus layer SSW-WNW
increasing, few altocumulus distant SSW-W and NNE-NE
Temperature: 69F, Dew point: 60F; Wind: NNE at 7 kts
Sea-level pressure: 30.07 inches Hg, rising 
Visibility: 40 miles, 45 miles WNW, hazy 
6-hour min. temp: 62F
BHO SA 1155 250 SCT 40 182/69/60/0207/007/ FEW AC DSNT SW-W AND 
NNE-NE CI/CS LYR SSW-WNW INCR THN K LYR ALG HRZN DSNT SSW 
VSBY WNW 45 HAZY WND GRDLY VEERING WND 36V07/ 8/045 51014 10069 20062 
 
10 A.M.
Weather: Scattered stratocumulus, broken thin cirrus, broken
dense cirrus, few cumulus S-OVHD, hazy
Temperature: 74F, Dew Point: 61F;  Wind: NNE at 5 kts
Wind: Direction variable NW-E
Sea-level pressure: 30.08 inches Hg, rising
Visibility: 40 miles, hazy
BHO SA 1455 35 SCT 220 –BKN 300 -BKN 40 187/74/61/0205/008/
FEW CU S-OVHD HAZY/ 8/801 51005 
 
1 P.M.
Weather: Scattered stratocumulus, scattered cirrus, thin broken
cirrus (2 layers), hazy
Temperature: 79F, Dew Point: 60F;  Wind: E at 4 kts,
Wind: Light and variable 
Sea-level pressure: 30.07 inches Hg, falling
Visibility: 40 miles, hazy 
6-hour max. temp: 80F 
BHO SA 1755 45 SCT 220 SCT 250 –BKN 300 –BKN 40 182/79/60/0804/007
MDT CUFRM TOPS CLR SKY BND N-E HAZY WND L/V 8/801 58005 10080 20069
 
WEATHER SUMMARY FOR WEDNESDAY, JULY 27
 
TEMPERATURE (DEGREES F)
MAX.....82    NORMAL.....82
MIN.....61    NORMAL.....63
MEAN....72    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL...................0
TOTAL DEPARTURE FOR THE MONTH...................+80 [+2.8 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............16 WSW AT  3:01 P.M.
                   AEROVANE...............23 WSW AT  3:00 P.M.
                   ASOS...................18 SW  AT  3:01 P.M.
                   DAVIS..................21 SW  AT  3:00 P.M.
THE FASTEST MILE FOR YESTERDAY............13 W   AT  4:30 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE.............14 WSW AT  8:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE............14 W   AT  4:34 P.M.
AVERAGE WIND SPEED AND DIRECTION........8.6  W
                   ASOS.................8.8
                   DAVIS................8.1 W [276 deg]
*last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.........-0.10
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR THE MONTH..........2.24  DEPARTURE.........-1.02
                         ASOS..............2.18
TOTAL PRECIPITATION FOR THE YEAR..........29.55  DEPARTURE.........+0.62
                        ASOS..............30.04**
**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/-1/0.01/530/58         15 WNW 
7/2  80/61/71/+1/0.00/603/66         17 SE
7/3  79/64/72/+2/0.02/018/02         22 S
7/4  86/68/76/+6/0.00/583/64         18 SW
7/5  89/66/78/+7/0.00/784/86         15 S
7/6  88/68/78/+7/T/792/87            30 WNW AERO 35 MPH TSTM
7/7  86/67/77/+6/0.00/481/53         17 WNW
7/8  74/65/70/-1/0.47/027/03         16 ESE TSTM
7/9  81/63/72/+1/0.11/698/77         29 WNW  
7/10 83/59/71/0/0.00/860/95          21 SSW
7/11 89/65/77/+5/0.00/814/90         23 S
7/12 90/72/83/+9/0.00/777/86         25 W
7/13 85/61/73/+1/0.73/469/52         21 NE
7/14 70/58/64/-8/0.37/801/89         28 NNE TSTM 
7/15 79/59/69/-3/0.00/692/77         17 SSW TSTM 
7/16 85/61/73/+1/0.00/834/93         15 SW
7/17 88/67/78/+6/0.00/797/89         30 SSW
7/18 84/70/77/+5/0.02/188/21         38 WSW AERO 43 MPH
7/19 86/69/78/+6/0.00/777/87         18 WNW AERO 24 MPH
7/20 88/69/79/+7/0.00/766/86         29 SSW
7/21 93/68/81/+9/0.00/685/77         37 SSW AERO 43 MPH
7/22 99/76/88/+16/0.00/852/96        28 W   AERO 36 MPH
7/23 90/68/79/+7/0.05/469/53         25 WNW TSTM * 
7/24 80/63/72/-1/0.03/274/31         20 NW  AERO 27 MPH
7/25 74/59/67/-6/0.34/123/14         16 ESE
7/26 80/61/71/-1/0.09/237/27         33 S   AERO 42 MPH
7/27 82/61/72/0/0.00/824/94          16 WSW
 
* TSTM day added
 
7/28 morning low 62F; normal low is 63F
 
DAILY RECORDS FOR JULY 2011
7/22 - RECORD HIGH MAXIMUM TEMPERATURE OF 99F;
ties the previous record of 99F set in 1926
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INCHES IN 1911
PEAK GUST 62 MPH SW IN 2006
 
RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INCHES IN 1901
PEAK GUST 40e MPH E IN 1941
 
TODAY'S REPORT PREPARED BY: Robert Skilling/George Tabeek/Erin Abbott