MONTHLY SUMMARY 



APRIL 1949 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.38, 29th 



Minimum 29.16, 6th 



Mean semi-daily 29.920 



Range 1.22 



Air Temperature, in Degrees F. 



Highest 79, 30th 



Lowest 27, 5th, 29th 



Mean 50.2 



Range 52 



Highest mean daily 61, 14th 



Lowest mean daily 40, 18th 



Mean maximum 62.5 



Mean minimum 37.9 



Greatest daily range 63, 14th 



Least daily range 40.5, 18th 



Degree-days of heating load for month. . . 444 

 Degree-days cumulative for season .... 5361 



Precipitation, in inches 



Precipitation 2.70 



Snow 



Maximum precip. in 24 hrs 0.73, 6th 



Number of days with .01 or more 11 



Wind, in miles 



Total movement 4820 



Greatest daily movem-mt 308, 7th 



Least daily movement 77, 2nd 



Mean hourly velocity 6.7 



Maximum velocity 32 ^ 6th, 9th 



Wind, direction 



Prevailing direction N 



North, days 5 



Northeast, days 10 



East, days 2 



Southeast, days 



South, days 2 



Southwest, days 6 



West, days 2 



Northwest, days 3 



Weather 



Mean relative humidiiy, percent 66.7 



Mean cloudiness, percent 49 



Number of ilear days 1 



Number of fair days 17 



Number of cloudy days 12 



Number of hoars bright sunshine 152.3 



Percent of possible hours of 



bright sunshine 38 



Thunder and lightning 6th and 15th 



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 



VVNW 



61.6 

 51.8 



11 

 9 



10 

 220 



54.7 

 Apr. 15 



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, 19-10, 1945 



75, 1901; 34, 1925, 1927 



23, 19-11; 3, 1898. 1902 



18, 1915; 2. 1894, 1901 



22, 1901; 1, 1941 



329, 1941; 103, 1901 



Mar. 14, 1910; May 11, VK)7 



Note — The first column in the above summarj- gives observations made during the month. 

 The second column gives the averages based on observations made from 1889 to 1^38, 

 except that humidity records are based on observations made from 1929 to 1938. The 

 third column gives extremes observed from 1889 to 1948. 



