MONTHLY SUMMARY 



Api-il 194i 



Normal 



Extremes 



Barometer, in inches 



( Readings reduced to sea level ) 



Maximum 30.36, 9th 



Minimum 29.55, 11th, 12th 



Mean semi-daily 30.013 



Range 0.81 



Air Temperature, in degrees F. 



H ighest 85, 25th 



Lowest 26, 1 4th 



Mean 49.7 



Range 59 



Highest mean daily 65.5, 30th 



Lowest mean daily 34, 10th 



Mean maximum 62.4 



Mean minimum 37.1 



Greatest daily range 44, 24th, 25th 



Least daily range 8, 10th 



Precipitation, in inches 



Precipitation 0.96 



Snow 5.00 



Maximum precip. in 24 hrs 0.43, 10th 



Number of days with .01 or more 8 



Wind, in miles 



Total movement 4640 



Greatest daily movement 274, 12th 



Least daily movement 56, 23rd 



Mean hourly velocity 6.4 



Maximum velocity 25, 19th 



Wind, direction 



Prevailing direction NW 



North, days 9 



Northeast, days 



East, days ..— - 



Southeast, days . —.6 



South, days 4 



Southwest, days 3 



West, days — — 1 



Northwest, days 7 



Weather 



Mean relative humidity, percent 59.2 



Mean cloudiness, percent 52 



Number of clear days -—13 



Number of fair days 11 



Number of cloudy days 6 



Number hours bright sunshine 245 



Percent of possible hours of bright 



sunshine 60.9 



Last snow April 1 1 



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 



30.71, 1911 



28.99, 1907, 1929 



1.52, 1930; .71, 1919 



90, 1941 



8.5, 1923 



52, 1921 ; 41.2, 1926 



6.89, 1929; .55, 1941 



11, 1891; 0, 1910, 1934 



18, 1909; 3, 1892 



8208, 1908; 3853, 1917 



40, 1935, 1938, 1940 



75,1901 : 34, 1925, 1927 



2.3, 1941 ; 3, 1898, 1902 



18, 1915; 2. 1894, 1901 



21, 1901 ; 1, 1941 



329, 1941 ; 103, 1901 



Mar. 14, 1910; May 11, 1907 



Note — Tlie first colunui in the above summary gives oljservations made during 

 the month. The second column gives 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 1941. 



