Monthly Summary 



April, 1934 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.63, 30th 



Minimum 29.24, 12th 



Mean semi-daily 30.001 



Range 1.39 



Air Temperature 



Highest 73, 18th 



Lowest 25, 29th 



Mean 46.2 



Monthly range 48 



Highest mean daily 62.5, 24th 



Lowest mean daily 35, 6th 



Mean maximum 57.3 



Mean minimum 35.0 



Greatest daily range 36, 2nd, 18th 



Least daily range 8, 6th 



Precipitation 



Precipitation. In inches 4.44 



Snow, in inches 



Maximum precipitation in 24 hrs. 2.29, 



11th and 12th 

 Number of days on which .01 or more 



inches of rain fell 11 



Wind (miles) 



Total movement 4,768 



Greatest daily movement .... 314, 28th 



Least daily movement, 62, 18th 



Mean hourly velocity 6.6 



Maximum velocity for 5 min., 39, 28th 

 (corrected to conform to 3 cup anemometer) 



Wind (direction) 



Prevailing direction wsw 



North, days 



Northeast, days 



East, days 2 



Southeast, days 8 



South, days 5 



Southwest, days 



West, days 2 



Northwest, days 13 



Weather 



Mean relative humidity, per cent . . 58.9 



Mean cloudiness, per cent 50.5 



Number of clear days 15 



Number of fair days 4 



Number of cloudy days 11 



Number of hours bright sunshine 239 

 Percent of possible hours of bright 



sunshine 59.5 



Thunder and Lightning 



Frosts after the 15th: 21st, 26th, 28th, 



29th 



30.48 



29.41 



29.99 



1.08 



79.5 

 21.6 

 45.8 



57.8 



3.27 

 2.32 



11 

 5,436 



7.5 

 29. 



69.6 

 49.2 

 11 

 10 

 9 

 221 



55 



30.71, 1911 

 28.99, 1907, 1929 



1.52, 1930; 0.72, 1919 



88.5, 1896 

 8.5, 1923 



6.89, 1929; 0.76, 1892 

 11, 1891; 0,1910 



18, 1909, 3, 1892 

 3,208, 1908; 3,853, 1917 



39, 19l'6, 1931, 1932 



81.2, 1916; 54.5, 1892 



75, 1901; 34, 1925, 1927 



19, 1911; 3, 1898, 1902 



18, 1915; 2, 1894, 1901 



22, 1901; 3, 1899, 1924 



296, 1911; 103, 1901 



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 

 1928. The third column gives extremes observed from 1889 to 19SS. 



