MONTHLY SUMMARY 



April. 1945 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.69, 7th 



Minimum __ 29.57. 27tb 



Mean semi-daily 30.050 



Range 1.12 



Air Temperature, in degrees F. 



Highest 86, 13th 



Lowest 26, 23rd 



Mean .._ 51.8 



Range 60 



Highest mean daily . 70, 13th 



Lowest mean daily' 41, 5th, 6th, 23rd 



Mean maximum 63.6 



Mean minimum ___... 40.0 



Greatest daily range , 44, 10th 



Least daily range 9, 2nd. 4th 



Precipitation, in inches 



Precipitation ...-. 5.43 



Snow — 



Maximum precipitation in 24 hrs. _ 2.83, 25th 

 Number of days with .01 or more 9 



Wind, in miles 



Total movement ^.__ 5369 



Greatest daily movement 484, 22nd 



Least daily movement 70, 30th 



Mean hourly velocity 7.5 



Maximum velocity 40, 5th 



Wind, direction 



Prevailing direction .....SW 



North, days _.. 



Northeast, days — 



East, days ..__.;. 1 



Southeast, days 13 



South, days 



Southwest, days 



West, days 8 



Northwest, days 8 



Weather 



Mean relative humidity, percent 67.6 



Mean cloudiness, percent 56 



Number of clear days .____:. 16 



Number of fair days — _ 8 



Number of cloudy days 6 



Number hours bright sunshine 258 



Percent of possible hours of bright 



sunshine 64.2 



Thunder and lightning — 



Last snow March 22 



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; .72, 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 



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. 1910 ; 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 1944. 



