MONTHLY SUMMARY 



April, 1946 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.50, 1 st 



Minimum 29.29, 26th 



Mean semi-daily 29.956 



Range 1.21 



Air Temperature, in degrees F. 



Highest _._- 78, 23rd 



Lowest 19, 1 st 



Mean 45.0 



Range 59 



Highest mean daily 59.5, 24th 



Lowest mean daily 27.5, 1st 



Mean maximum 55.7 



Mean minimum 34.2 



Greatest daily range 43, 23rd 



Least daily range 7, 27th 



Precipitation, in inches 



Precipitation —2.16 



Snow . 1.50 



Maximum precip. in 24 hrs. 82, 26th 



Number of days with .01 or more 10 



Wind, in miles 



Total movement 5630 



Greatest daily movement —.408, Sth 



Least daily movement 63, 22nd 



Mean hourly velocity 7.8 



Maximum velocity 35, 2nd 



Wind, direction 



Prevailing direction .-. _ W 



North, days — _ _ 2 



Northeast, days - 



East, days 



Southeast, days 7 



South, days 1 



Southwest, days 2 



West, days — -— _ 10 



Northwest, days 8 



Weather 



Mean relative humidity, percent 64.6 



Mean cloudiness, percent 53 



Number of clear days — - _13 



Number of fair days 9 



Number of cloudy days 8 



Number of hours bright sunshine -228 



Percent of possible hours of bright 



sunshine — 56.7 



Thunder and lightning ._ .2nd, 3rd 



Last snow April 8 



Normal 



30.48 



29.38 



29.99 



1.11 



79.4 

 22.0 

 45.7 

 57.4 



56.8 

 34.8 



3.35 

 2.17 



11 



5404 



7.5 

 31.4 



WNW 



61.6 



51.8 



11 



9 



10 



220 



54.7 



Apr. 15 



Extremes 



30.71, 1911 

 28.98, 1943 



1.52, 1930; n, 1919 



90, 1941 



8.5, 1923 



52, 1921 ; 41, 1943 



6.89, 1929; .55, 1941 

 11, 1891; 0, 1910, 1934 



18, 1909; 3, 1892 



8208, 1908; 3853, 1917 



40, 1935, 1938, 1940, 1945 



75, 1901 ; 34, 1925, 1927 



23, 1941 ; 3, 1898, 1902 



18, 1915; 2, 1894, 1901 



22, 1901; 1, 1941 



329, 1941; 103, 1901 



Mar. 14, 1-910; May 11, 1907 



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 1938, except that humidity records are based on observations made 

 from 1929 to 1938. The third column gives extremes observed from 1889 to 1945. 



