Monthly Summary 



July. 1930 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.16> 5th, 16th 



Minimum 29.51, 21st 



Mean semi-daily 29.893 



Range 65 



Air Temperature 



Highest 95,21st 



Lowest 46,16th 



Mean 69.9 



Monthly range 49 



Highest mean daily 79.5, 19th 



Lowest mean daily 63.5, 5th, 16th 



Mean maximum 81.6 



Mean minimum 58.1 



Greatest daily range 38, 21st 



Least daily range 12, 22nd, 28th 



Precipitation 



Precipitation. In inches 4.50 



Snow, in inches 



Maximum precipitation in 24 hrs. 



.98, 14th, 24th 

 Number of days on which .01 or 



more inches of rain fell 13 



Wind (miles) 



Total movement 3,455 



Greatest daily movement 192, 8th 



Least daily movement 57, 26th 



Mean hourly velocity 4.6 



Maximum velocity for 5 min 25, 21st 



(corrected tcj conform to 3 cup anemometer) 

 Wind (direction) 



Prevailing direction wsw 



North, days 2 



Northeast, days 



East, days 



Southeast, days 4 



South, days 10 



Southwest, days 1 



West, days 4 



Northwest, days 10 



Weather 



Mean relative humidity, per cent . . 70.4 



Mean cloudiness, per cent 50 



Number of clear days 14 



Number of fair days 13 



Number of cloudy days 4 



Number of hours bright sunshine 298.3 

 Percent of possible hours of bright 



sunshine 65 



Thunder and lightning 6th, 9th, 11th, 26th 

 Frosts 



30.28 



29.60 



29.972 



0.68 



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, 1889 



14.51, 1897; .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 and third columns give the averages and extremes observed from 1889 

 to 1929. 



