Monthly Summary 



April, 1929 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.39, 3rd 



Minimum 28.99, 17th 



Mean semi-daily 29.915 



Range 1.40 



Air Temperature 



Highest 86.5,8th 



Lowest 22.0, 11th 



Mean 45.2 



Monthly range •■ 64.5 



Highest mean daily 71.7, 8th 



Lowest mean daily 32.5, 14th 



Mean maximum 54.7 



Mean minimum 36.3 



Greatest daily range 47, 7th 



Least daily range 4.0, 12th, 16th 



PrecipitaHoit 



Precipitation. In inches 6.89 



Snow. In inches 5.5 



Maximum precipitation in 24 hrs. 1.55, 



12th 

 Number of days on which .01 or 



moi'e inches of rain fell 17 



Wind (miles) 



Total movement 5778 



Greatest daily movement 462, 2nd 



Least daily movement 56, 14th 



Mean hourly velocity 8.0 



Maximum velocity for 5 min 35, 2nd 



(corrected to conform to 3 cup anemometer) 

 Wind (direction) 



PrevaiUng direction w 



North, days 5 



Northeast, days 2 



East, days 1 



Southeast, days 3 



South, days 3 



Southwest, days 3 



West, days 9 



Northwest, days 4 



W e a 1 h e r 



Mean relative humidity, per cent 69.0 



Mean cloudiness, per cent 60.0 



Number of clear days 7 



Number of fair days 7 



Number of cloudy days 16 



Number of hours bright sunshine 142.0 

 Percent of possible hours of bright 



sunshine 35.0 



Frosts after the 15th, 23rd 



Thunder and lightning 7th, 26th 



30.48 



29.41 



29.99 



1.08 



79.5 

 21.6 

 45.8 

 57.8 



3.27 

 2.32 



10 

 5436 



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 



6.59, 1914; 0.76, 1892 

 11, 1891; 0, 1910 



18, 1909; 3, 1892 

 8208, 1908; 3853, 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 



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 frcjni 1SS9 

 to 192S for the same month of the year. 



