MONTHLY SUMMARY 



April, 1948 



Barometer, in inches 



(Readings reduced to sea leveD 



Maximum 30.61. 13th 



Minimum 29.40. 30th 



Mean semi-daily 30.094 



Range 1.21 



Air Temperature, in degrees F. 



Highest 73, 5th, 24th 



Lowest 23, 11th 



Mean 47.21 



Range 50 



Higliest mean daily 5S.0, 24tht 



Lowest mean daily 36.0, llthl 



Mean maximum 58.51 



Mean minimum 35. 8 j 



Greatest daily range 40, 23rd 



Least daily range 5, 1st 



Degree-days of heating load for 



month 536 



Degree-days cumulative for season. ...6664i 



Precipitation, in inches i 



Precipitation 2.87i 



Snow T. 3rd| 



Maximum precip, in 24 hrs 78, 14th| 



Number of days with .01 or more lOJ 



Wind in miles 



Total movement 5656 



Greatest daily movement 474, 3rdi 



Least daily movement 46, 22nd 



Mean hourly velocity 7.7| 



Maximum velocity 40, 9th 



Wind, direction 



Prevailing direction SWj 



North days Si 



Northeast, days 3] 



East, days li 



Southeast, days 4] 



South, days 7 



Southwest, days 3 



West, days 3 



Northwest, days 6' 



Weather j 



Mean relative humidity, percent 58.0 



Mean cloudiness, percent 84 



Number of clear days lOJ 



Number of fair days 4! 



Number of cloudy days 16j 



Number of hours bright sunshine 179' 



Percent of possible hours of 

 bright sunshine 45j 



3.35 

 2.17 



11 

 5404 



( .0 



31.4 



6.89, 1929; .55, 1941 

 11. 1S91; 0, 1910, 1934 



IS. 1909; 3, 1892 

 8208. 1908;3853, 1917 



40, 1935 1938, 1940, 1945 



WNW ! 



61.6 



51.8 



11 



9 



10 



220 



54.7 



75. 1901; 34, 1925, 1927 



23, 1941; 3, 1898, 1902 



IS, 1915; 2, 1894, 1901 



22. 1901; 1, 1941 



329 1941; 103, 1901 



Thunder and lightning No. 4, 30thi Apr. 15 'Mar. 1 1. 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 observa- 

 tions 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 1947. 



