Monthly summary 



April, ig.-iS 



Normal 



Extremes 



Barometer 



{ Reading's reduced to sea levelj 



Maximum 30.28, 11th 



Minimum 29.35, 17th 



Mean semi-daily 29.896 



Range 0.93 



Air Tempera* 11 re 



Highest 86, 27th 



Lowest 23, 4th 



Mean 45.0 



Monthly range 63 



Highest mean daily 69.5, 27th 



Lowest mean daily 34.0, 5th 



Mean maximum 54.7 



Mean minimum 35.3 



Greatest daily range 39, 26tii 



Least daily range 4, 12th 



Precipiiatioii 



Precipitation. In inches 2.54 



Snow, in inches 1-00 



Maximum precipitation in 24hrs. 0.63, 



13th 

 Number of days on which .01 or more 



inches of rain fell 10 



Wind (miles) 



Total movement 5197 



Greatest daily movement 294, lOth 



Least daily movement 62, 21st 



Mean hourly velocity 7.2 



Maximum velocity for 5 min., 40, 18th, 

 25th, 28th 



Wind (direction) 



Prevailing direction nnw 



North, days 6 



Northeast, days 2 



East, days 



Southeast, days 3 



South, days 1 



Southwest, days 



West, days 1 



Northwest, days 17 



Weather 



Mean relative humidity, per cent . . 65.7 



Mean cloudiness, per cent 65.2 



Number of clear days 11 



Number of fair days 11 



Number of cloudy days 8 



Number of hours bright sunshine ..191 

 Percent of possible hours of bright 



sunshine 47.5 



Thunder and Lightning 



Frosts after the 15th: 17th, 18th, 26th 



30.48 



29.41 



29.99 



1.08 



79.5 

 21.6 

 45.8 

 57.8 



30.71, 1911 

 • 28.99, 1907, 1929 



1.52, 1930; 0.72, 1919 



38.5, 1896 

 8.5, 1923 



3.27 

 2.32 



11 

 5,436 

 7.5 



6.89, 1929; 0.76, 1892 

 11, 1891; 0,1910 



18, 1909; 3, 1892 

 8,208, 1908; 3,853, 1917 



29 139,1916,1931,1932,1934 



69.6 

 49.2 

 11 

 10 

 9 

 221 



55 



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 18f9 to 

 1928. The third column gives extremes observed from 1889 to 19.S4. 



