MONTHLY SUMMARY 



July, 1947 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.34, 2Sth 



Minimum 29.62, 19th 



Mean semi-dai!v 29.941 



Range '. 0.72 



Air Temperature, in degrees F. 



Highest 91, 30th 



Lowest 51. 5th 



Mean 73.2 



Range 40 



Highest mean daily 80.5. 3 1st 



Lowest mean daily 63.5, 8th 



Mean maximum 83.8 



Mean minimum 62.6 



Greatest daily range 35, 5th 



Least daily range 9. 22nd 



Precipitation, in inclies 



Precipitation 2.73 



Snow — 



Maximum precip. in 24 hrs 1.00,22nd 



Number of days with .01 or more 14 



Wind, in miles 



Total movement 3 ,643 



Greatest daily movement 214, 2nd 



Least daily movement 60, 5th 



Mean hourly velocity 5.2 



Maximum velocity 32, 1st 



Wind, direction 



Prevailing direction SSW 



North, days 2 



Northeast, days 2 



East, days 



Southeast, days 7 



South, days 7 



Southwest, days 7 



West, days 3 



Northwest, days 3 



Weather 



Mean relative humidit}% percent 72.3 



Mean cloudiness, percent 32 



Number of clear days 14 



Number of lair days 11 



Number of cloudy days 6 



Number of hours bright sunshine 282 



Percent of possible hours of 



bright sunshine 69 



Thunder and lightning 1st, 30th 



4.10 

 11 



3422 



4.6 



28.7 



sw 



68.4 

 50.9 

 10 

 14 



7 

 268 



58 



Extremes 



14.51, 1897; 0.70, 1929 



20. 1915; 4, 1924 



5097, 1909; 1109, 1894 



44, 1936 



70, 1943; 31, 1924 



22, 1923; 0, 1915 



24, '09, '21; 4, 1946 



18, 1889; 0, 1910 



371. 1910; 180. 1931 



Note — The first column in the above summary gives observations made during the 

 month. The second column gives the averages based on observations made from 

 1889 to 1938, except that humidity records are based on observations made from 

 1929 to 1938. The third column gives extremes observed from 1889 to 1946. 



