MONTHLY SUMMARY 



April 1941 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.43, 12th, 23rd 



Minimum 29.62, 20th 



Mean semi-daily 30.071 



Range 81 



Air Temperature, in degrees F. 



Highest 90, 20th 



Lowest 28, 1st, 9th, 23rd 



Mean 52.1 



Range 62 



Highest mean daily . . .71.5, 20th 



Lowest mean daily 37.5, 1st 



Mean maximum 66.0 



Mean minimum 38.2 



Greatest daily range 44, 29th 



Least daily range 16, 2nd 



Precipitation, in inches 



Precipitation 55 



Snow 



Maximum precipitation in 24 hrs. 



.26, 23rd, 24th 



Number of days with .01 or more 5 



Wind, in miles 



Total movement 5249 



Greatest daily movement 313, 28th 



Least daily movement 64, 9th 



Mean hourly velocity 7.3 



Maximum velocity 30, 21st 



Wind, direction 



Prevailing direction N 



North, days 7 



Northeast, days 2 



East, days 2 



Southeast, days 3 



South, days 6 



Southwest, days 



West, days 



Northwest, days 10 



Weather 



Mean relative humidity, percent 57.3 



Mean cloudiness, percent 35 



Number of clear days 23 



Number of fair days 6 



Number of cloudy days 1 



Number hours bright sunshine 329 



Percent of possible hours of bright 



sunshine 818 



Last Snow March 17 



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 



30.71, 1911 

 28.99, 1907, 1929 



1.52, 1930; .72, 1919 



88.5, 1896 



8.5, 1923 



52, 1921; 41.2, 1926 



6.89, 1929; .76, 1892 

 11, 1891; 0, 1910,1934 



18, 1909; 3, 1892 

 8208, 1908; 3853, 1917 



40, 1935, 1938, 1940 



75, 1901; 34, 1925, 1927 

 19, 1911; 3, 1898, 1902 

 18, 1915; 2, 1894, 1901 

 22, 1901; 3, 1899, 1924 

 296, 1911; 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 1940. 



