MONTHLY SUMMARY 



April 1943 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum - 30.42, 18th 



Minimum ._-28.98. 14th 



Mean semi-daily 29.955 



Range -.1.44 



Air Temperature, in degrees F. 



Highest 12., 25th 



Lowest 19, 4th, 6th, 7th 



Mean 41.0 



Range 53 



Highest mean daily 55.5, 25th, 26th 



Lowest mean daily 24.5, 6th 



Mean maximum 51.0 



Mean minimum 30.9 



Greatest daily range 40, 23rd 



Least daily range 7, 21st 



Precipitation, in inches 



Precipitation 3.66 



Snow 1 .75 



Maximum precip. in 24 hrs. . 0.94, 19th 20th 

 Number of days with .01 or more 14 



Wind, in miles 



Total movement 6200 



Greatest daily movement 481, 6th 



Least daily movement 62, 1st 



Mean velocity 8.6 



Maximum velocity 39, 28th 



Wind, direction 



Prevailing direction W 



North, days 2 



Northeast, days — - .— 1 



East, days - 



Southeast, days - ___. .5 



South, days __. 1 



Southwest, days 2 



West, days 10 



Northwest, days 9 



Weather 



Mean relative humidity, percent 59.4 



Alean cloudiness, percent ..55.7 



Number of clear days 10 



Number of fair days 12 



Number of cloudy days 6 



Number hours bright sunshine 247 



Percent of possible hours of bright 



sunshine ..,- 61.4 



Thunder and lightning 27th, 28th 



Last snow April 14 



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 



30.71, 1911 

 28.99, 1907, 1929 



1.52, 1930; Jl, 1919 



90, 1941 



8.5, 1923 



52, 1921; 41.2, 1926 



6.89, 1929; .55, 1941 



11, 1891; U, 1910, 1934 



18, 1909; 3, 1892 



8208, 1908; 3853. 1917 



40, 1935, 1938, 1940 



Note — The first column in the aliove summary gives observations made during 

 the month. The second column gives the averages based on observations made 

 from 1889 to 1938, excc])t that humidity records are based on observations made 

 from 1929 to 1938. The third column gives extremes observed from 1889 to 1942. 



