MONTHLY SUMMARY 



JULY 195i 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.353, 1st 



Minimum 29.750, 19th 



Mean semi-daily 30.062 



Range 0.603 



Air Temperature, in degrees F. 



Highest 95, 14th, 23rd 



Lowest 50, 1st 



Mean 75 



Range 45 



Highest mean daily 82.5, 22nd 



Lowest mean daily 65.5, 25th 



Mean maximum 86.9 



Mean minimum 63 



Greatest daily range 7)1 , 26th 



Least daily range 3, 10th 



Degree-days of heating load for month 

 Degree-days cumulative for season 



Precipitation, in inches 



Precipitation 4.99 



Snow — 



Maximum precip. in 24 hrs 2.01, 10th 



Number of days with .01 or more 5 



Wind, in miles 



Total movement 2919 



Greatest daily movement 157, 19th 



Least daily movement ZZ, 12th 



Alean hourly velocity 3.92 



Maximum velocity 32, 10th 



Wind, direction 



Prevailing direction S 



North, days 3 



Northeast, days 1 



East, days — 



Southeast, days 4 



South, days 8 



Southwest, days 4 



West, days 7 



Northwest, days 4 



Weather 



Mean relative humidity, percent 72 



Mean cloudiness, percent 36.6 



Number of clear days 16 



Number of fair days 12 



Number of cloudy days 3 



Number of hours bright sunshine 284.2 



Percent of possible hours of 



bright sunshine 61.3 



Thunder and lightning 4, 10, 27, 31 



30.27 



29.59 



29.96 



0.68 



93.9 

 46.4 

 70.8 

 47.7 



4.10 

 11 



3422 



4.6 

 28.7 



SW 



68.4 

 50.9 

 10 

 14 

 7 

 268 



58 



30.50, 1892 

 29.27, 1932 



0.97, 1892; 0.47, 1938 



104, 1911 



40, 1890, 1898 



66.3, 1891 ; 76.0, 1949 



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, 1909, 1921 ; 4, 1946 



18, 1889; 0, 1910 



371, 1910; 180, 1931 



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

 month. The second column lists 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 1951. 



