MONTHLY SUMMARY 



APRIL, 1952 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.421, 9th 



Minimum 29.482, Sth 



Mean semi-daily 29.804 



Range 0.939 



Air Temperature, in degrees F. 



Highest 82,20th 



Lowest 27, 12th 



Mean 50.8 



Range 55 



Highest mean daily 71, 20th 



Lowest mean daily 40.5, 12th 



Mean maximum 61.7 



Mean minimum 39.8 



Greatest daily range 45, 22nd 



Least daily range 9, 28th 



Degree-days of heating load for month, 433 

 Degree-days cumulative for season, 5932.0 



Precipitation, in inches 



Precipitation 3.40 



Snow 0.0 



Maximum precip. in 24 hrs 1.19, 28th 



Number of days with .01 or more 8 



Wind, in miles 



Total movement 3788 



Greatest daily movement 310, 20th 



Least daily movement 35, 26th 



Mean hourly velocity 5.3 



Maximum velocity 25, 20th, 30th 



Wind, direction 



Prevailing direction NE 



North, days 1 



Northeast, days 10 



East, days 



Southeast, days 4 



South, days 1 



Southwest, days 4 



West, days 1 



Northwest, days 9 



Weather 



Mean relative humidity, percent 72.6 



Mean cloudiness, percent 61.2 



Number of clear days 12 



Number of fair days 9 



Number of cloudy days 9 



Number of hours bright sunshine 237.8 



Percent of possible hours of 



bright sunshine 59.4 



Thunder and lightning — 



Last Snow 



30.48 



29.38 



29.99 



1.11 



79.4 

 22.0 

 45.7 

 57.4 



56.8 

 34.8 



579 

 6455 



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 

 28.98, 1943 



1.52, 1930; 0.65, 1950 



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 ; 1, 1949 



18, 1915; 2, 1894, 1901 



22, 1901 ; 1, 1941 



329, 1941 ; 103, 1901 



Mar. 14, 1910;Mayll, 1907,'45 



Note — The first column in the above summary lists observations made during the 

 month. The second column lists 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 1951. 



