MONTHLY SUMMARY 



APRIL, 1953 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.102, 30th 



Minimum 29.328. 13th 



Mean si mi-daily 29.7(S6 



Range 0.774 



Air Temperature, in degrees F. 



Highest 69, 23rd. 24th 



Lowest 32, 6th. 13th, I4th 



Mean 47.6 



Range 37 



Highest mean daily 5^.0, 23rd 



Lowest mean daily . .'■* 35.5. 14th 



Mean maximum 56.4 



Mean minimum 3S.7 



Greatest daily range 32.0, 4th, 29th 



Least daiU range 2.0, 26th 



Degree-days of heating load for month 520 

 Degree-days cumulative for season. . . 5652 



Precipitation, in inches 



Precipitation 5.36 



Snow 1.8 



Maximum precip. in 24 hrs 1.05 



Number of days with .01 or more 15 



Wind, in miles 



Total movement 4354 



Greatest daily movement 395, 14th 



Least daily movement 36, 26th 



Mean hourly velocity 6.0 



Maximum velocity 39, 23rd 



Wind, direction 



Prevailing direction VVNW 



North, days 1 



Northeast, days — 



East, days — 



Southeast, days 4 



South, days 3 



Southwest, days 2 



West, days 13 



Northwest, days 7 



Weather 



Mean relative humidity, percent 68.5 



Mean cloudiness, percent 65.6 



Number of clear days 12 



Number of fair days 9 



Number of cloudy days 9 



Number of hours bright sunshine. . . . 189.8 

 Percent of possible hours of 



bright sunshine 47.4 



Thunder and lightning 10th, 26th 



Last snow April 20th 



Normal 



30.48 



29.38 



29.99 



Lll 



79.4 

 22.0 

 45.7 

 57.4 



56.S 

 34. S 



SI") 

 6455 



l.\7 

 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; 0.65, 1950 



yO, 1941 



^3. 1923 



:2.1, 1V41; 41, 1943 



0.89, 1929; .55, 1941 

 11, 1891; 0, 1910, 1934 



18, 1909; 3, 1892 



8208. 1908; 3853, 1917 



40, 1935, 193S, 1940, 1945 



75, 1901; 34. 1925, 1927 



23, 1941; 1, 1949 



18, 1915; 2. 1894, 1901 



22, 1901; 1, 1^)41 



329, 1941; 103, 1901 



Mar. 14, 1910; May 11, 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 lecords are based on observations made from 1929 to 1938. The 

 third column lists extremes observed from 1889 to 1952. 



