MONTHLY SUMMARY 



APRIL, 1950 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.31, 10th 



Minimum 29.66, 23rd 



Mean semi-daily 29.95 



Range 0.65 



Air Temperalure, in Degrees F. 



Highest 75, 4th 



Lowest 22, 1st 



Mean 43.8 



Range 53 



Highest mean daily 57, 4th 



Lowest mean daily 31.5, 13th 



Mean maximum 54.5 



Mean minimum 33.4 



Greatest daily range 34, 19th 



Least daily range 5, 13th, 26th 



Degree-days of heating load for month . 637 

 Degree-days cumulative for season. . . 6105 



Precipitation, in inches 



Precipitation 3.64 



Snow 7.6 



Maximum precip. in 24 hrs 1.67 



Number of days with .01 or more 13 



Wind, in miles 



Total movement 4646 



Greatest daily movement 288, 12th 



Least daily movement 67, 17th 



Mean hourly velocity 6.45 mph 



Maximum velocity 28 mph, 5th 



Wind, direction 



Prevailing direction NW 



North, days 9 



Northeast, days 1 



East, days 



Southeast, days 5 



South, days 5 



Southwest, days 2 



West, days 1 



Northwest, days 7 



Weather 



Mean relative humidity, percent 66.5 



Mean cloudiness, percent 56 



Number of clear days 10 



Number of fair days 11 



Number of cloudy days 9 



Number of hours bright sunshine 189.1 



Percent of possible hours of 



br'ght sunshine 47.2 



Thun 'er and lightning 



Last Snow 29th 



Last Frost 30th 



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 



Extr 



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, 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; May 11. 1907.'45 



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 lecords are based on observations made from 1929 to 1938. The 

 third column gives extremes observed from 1889 to 1949. 



