MoNTHLv Summary 



July, 1981 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.13, 13th 



Minimum 29.43,19th 



Mean semi-daily 29.905 



Range 0.70 



Air Temperature 



Highest 94, 29th 



Lowest 53, 26th 



Mean 73.1 



Monthly range 41 



Highest mean daily 83.0, 29th 



Lowest mean daily 66.5, 18th 



Mean maximum 78.0 



Mean minimum 63.0 



Greatest daily range 31, 27th 



Least daily range 7, 18th 



Precipitation 



Precipitation. In inches 3.87 



Snow, in inches 



Maximum precipitation in 24 hrs. 0.96, 



6th 

 Number of days on which .01 or 



more inches of rain fell 13 



Wind (miles) 



Total movement 3,158 



Greatest daily movement .... 186, 31st 



Least daily movement 56, 24th 



Mean hourly velocity 4.0 



Maximum velocity for 5 min 22, 31st 



(corrected to conform to 3 cup anemometer) 



Wind (direction) 



Prevailing direction s 



North, days 



Northeast, days 



East, days 



Southeast, days 14 



South, days 9 



Southwest, days 1 



West, days 1 



Northwest, days 6 



Weather 



Mean relative humidity, per cent. . 70 



Mean cloudiness, per cent 62 



Number of clear days 2 



Number of fair days 17 



Number of cloudy days 12 



Number of hours bright sunshine 179.8 

 Percent of possible hours of bright 



sunshine 39.0 



Thunder and lightning 21st, 24th 



30.28 



29.60 



29.972 



.68 



93.9 

 45.5 

 70.6 



48.4 



4.33 



11 

 3,435 



4.6 

 24 



75.6 



50.1 



9 



14 



8 



266 



58 



30.50, 1892 

 29.39, 1909 



0.97, 1892; 0.51, 1895, 1899 



104, 1911 

 34.0, 1889 



14.51, 1897; 0.70, 1929 



20, 1915; 4, 1924 

 5,097, 1909; 1,109, 1894 



39, 1908, 1915 



88.8, 1927; 64.8, 1893 

 69, 1914; 31, 1924 

 22, 1923; 0, 1915 

 24, '09, '21; 5, '89, '23, '28 

 18,1889; 0, 1910 

 371, 1910; 182, 1889 



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

 month. The second column gives averages based on observations made from 1889 to 

 1928. The third column gives extremes observed from 1889 to 1980, 



