BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 29, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARM AND VERY HUMID TODAY ALONG WITH
VERY HAZY CONDITIONS
 
Dew point temperatures have risen to 73F early
this afternoon and are the highest we've
recorded thus far this season and year.  The
air temperature has reached the lower 80's and
is rising only very slowly due to considerable
cloudiness.  Visibility was reduced in fog
this morning which became haze with the view
only 9 miles early this afternoon. 
 
Today's observations:
 
7 A.M.  
Weather: Overcast stratus 
Temperature: 72F, Dew point: 70F, Wind: S at 10 kts,
Sea-level pressure: 29.95 inches Hg, rising
Visibility: 4 miles in thin fog
24-hour precipitation: 0.00 inches
6-hour minimum temp: 69F
BHO SA 1155 E6 OVC 4F 141/72/70/1910/995/ 8/6// 51009 
10072 20069  
 
10 A.M.
Weather: Overcast stratus, small break in overcast overhead,
higher clouds visible 
Temperature: 77F, Dew point: 71F, Wind: S at 10 kts
Sea-level pressure: 29.94 inches Hg, falling
Visibility: 5 miles, haze
BHO SA 1455 E10 OVC 5H 139/77/71/1810/994/
SML BINOVC INOVC HIER CLD VSBY OVHD BRGHT
SPTS IOVC/ 8/63/ 58002
 
1 P.M.  
Weather: Broken variable to scattered stratocumulus,
broken altocumulus and cirrus 
Temperature: 82F, Dew point: 73F, Wind: SSE at 12 kts,
Wind: direction variability SE to S 
Sea-level pressure: 29.89 inches Hg, falling
Visibility: 9 miles, hazy 
6-hourly max. temp: 82F
BHO SA 1755 E16 BKN 150 BKN 250 BKN 9 123/82/73/1612/989/
16 BKN V SCT HAZY WND 13V19/ 8/531 58016 10082 20072 
 
WEATHER SUMMARY FOR TUESDAY JULY 28
 
TEMPERATURE (DEGREES F)
MAX.....86    NORMAL.....82
MIN.....67    NORMAL.....63
MEAN....77    NORMAL.....72
 
DEPARTURE FROM 30-YEAR AVERAGE..........+5
TOTAL DEPARTURE FOR THE MONTH..........-99  [-3.7 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............24 S    AT   5:55 P.M. * 
                   AEROVANE..............23 S    AT   5:55 P.M.  
                   ASOS..................23 S    AT   4:56 P.M.         
                   DAVIS.................24 S    AT   4:34 P.M. 
FASTEST MILE FOR YESTERDAY...............18 S    AT   4:34 P.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE............18 S    AT   4:35 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 S    AT   4:34 P.M.   
AVERAGE WIND SPEED AND DIRECTION....... 9.0 S
                   ASOS.................9.5 
                   DAVIS................8.3 S [190 DEG]
 
* last of several occurrences....
 
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..........6.87  DEPARTURE....+3.49
                         ASOS..............7.01
TOTAL PRECIPITATION FOR THE YEAR..........30.51  DEPARTURE....+1.46
                         ASOS.............31.66
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2009 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  62/57/60/-10/0.51/000/00   25 NNE   TSTM
7/2  66/56/61/-9/1.00/000/00    29 SSW   TSTM
7/3  75/58/67/-3/T/283/31       23 WSW
7/4  77/59/68/-2/0/838/92       43 W       
7/5  78/54/66/-5/0/856/94       33 W     
7/6  79/60/70/-1/0/883/97       20 SSE
7/7  66/58/62/-9/0.73/027/03    28 SE    TSTM
7/8  67/56/62/-9/0.23/091/10    27 NNE   TSTM
7/9  66/55/61/-10/0/689/76      23 NE
7/10 76/54/65/-6/0/896/99       21 SW
7/11 77/56/67/-5/0.29/686/76    36 S
7/12 78/60/69/-3/0.33/650/72    30 SSW   TSTM
7/13 76/55/66/-6/0/802/89       32 SW 
7/14 75/56/66/-6/0/567/63       25 WNW
7/15 79/55/67/-5/0/826/92       30 WSW
7/16 77/62/70/-2/T/161/18       30 S
7/17 86/65/76/+4/0.01/582/65    24 ESE
7/18 84/66/75/+3/0.35/447/50    25 SSW   TSTM
7/19 80/62/71/-1/0/865/97       27 WSW
7/20 80/64/72/0/0/481/54        16 E
7/21 66/61/64/-8/0.62/000/00    29 NNE
7/22 77/61/69/-3/T/160/18       15 W
7/23 72/60/66/-6/0.68/195/22*   35 NE
7/24 69/60/65/-8/2.07/088/10*   46 NE    AERO 45 NE
7/25 83/61/72/-1/0/766/87       30 SSE
7/26 82/68/75/+3/0.05/422/48    32 S     
7/27 83/69/76/+4/0/588/67       30 S     TSTM (no rain, (12-1AM)
7/28 86/67/77/+5/0/709/81       24 S
 
7/29 our morning low temp: 69F; our normal low is now 63F
 
NEW DAILY RECORDS FOR JULY 2009 TO DATE...
7/24: New record peak gust 46 MPH NE at 3:32 A.M.
      surpasses previous record of 43 MPH S IN 2008
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
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
 
RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INCHES IN 1976
PEAK GUST 70e MPH SW 1944
 
TODAY'S REPORT PREPARED BY: Robert Skilling