Monthly Summary 



April, 1930 



Normal 



Extremes 



Baromeier 



(Readings reduced to sea level) 



Maximum 30.59, 17th 



Minimum 29.07, 7th 



Mean semi-daily 30.039 



Range 1.52 



Air Temperalure 



Highest 75.0, 30th 



Lowest 25.0, 10th, 24th 



Mean 44.1 



Monthly range 50.0 



Highest mean daily 58.5, 14th 



Lowest mean daily 27.0, 23rd 



Mean maximum 55.3 



Mean minimum 33.0 



Greatest daily range 39.0, 30th 



Least daily range 2.0, 23rd 



Precipiiation 



Precipitation. In inches 1.41 



Snow, in inches Trace 



Maximum precipitation in 24 hrs. .71, 



7th. 

 Number of days on which .01 or 



more inches of rain fell 8 



Wind (miles) 



Total movement 5,531 



Greatest daily movement 418, 2nd 



Least daily movement 67, 10th 



Mean hourly velocity 7.7 



Maximum velocity for 5 min .... 30, 23rd 



(corrected to coritorm to 3 cup anemometer) 

 Wind (direction) 



Prevailing direction ssw 



North, days 3 



Northeast, days 



East, days 3 



Southeast, days 8 



South, days 3 



Southwest, days 4 



West, days 7 



Northwest, days 2 



Weather 



Mean relative humidity, per cent . . 59 



Mean cloudiness, per cent 48 



Number of clear days 15 



Number of fair days 11 



Number of cloudy days 4 



Number of hours bright sunshine 273.4 

 Percent of possible hours of bright 



sunshine 68.0 



Thunder and lightning 



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 



55.0 



30.71, 1911 

 29.14, 1891 



1.42,1891,1907; 0.72, 1919 



88.5, 1896 

 8.5, 1923 



6.89, 1929; 0.76, 1892 

 11, 1891; 0,1910 



18, 1909 ; 3, 1892 

 8,208, 1908; 3,853, 1917 



39, 1916 



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 



N()Ti'-Tlie first column in the above summary gives observations made during the 

 month, llie second and third colunns give the averages and extremes observed from i88g 

 to 1929. 



