MONTHLY SUMMARY 



March 1940 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.59, 2nd 



Minimum 29.39, 31st 



Mean semi-daily 29.925 



Range 1.20 



Air Temperature, in degrees F. 



Highe.st 59,31st 



Lowest 5, 2nd 



Mean 30.1 



Range 54 



Highest mean daily 48.5, 31st 



Lowest mean daily 16.5, 23rd 



Mean maximum 37.4 



Mean minimum 22.7 



Greatest daily range 30, 2nd 



Least daily range 4, 4th 



Precipitation, in inches 



Precipitation 5.58 



Snow 9.00 



Maximum precipitation in 24 hrs. 



1.48, 15th, 16th 



Number of days with .01 or more 13 



Wind, in miles 



Total movement 5493 



Greatest daily movement 384, 11th 



Least daily movement 49, 14th 



Mean velocitv 7.4 



Maximum velocity 32, 11th, 23rd 



Wind, direction 



Prevailing direction WNW 



North, days 5 



Northeast, days 



East, days 



Southeast, days 



South, days 2 



Southwest, days 3 



West, days 



Northwest, days 13 



Weather 



Mean relative humidity, percent 73.6 



Mean cloudiness, percent 54.4 



Number of clear days 13 



Number of fair days 8 



Number of cloudy days 10 



Number hours bright sunshine 199 



Percent of possible hours of bright 



sunshine 53.6 



Thunder and lightning 



30.57 



29.24 



30.00 



1.34 



63.8 



6.1 



34.4 



57.6 



43.2 

 25.4 



3.70 



7.47 



11 

 5944 



7.7 

 31.2 



WNW 



64.2 



51.8 



11 



10 



10 



199 



53.6 



30.96, 1904 

 28.47, 1914 



2.10, 1914; 0.85, 1915 



79.5, 1907, 1921 

 -7.5, 1906 



7.13, 1899; 0.12, 1915 

 27, 1899; 0, 1921 



17,1890, 1913, 1936; 3, 1915 

 8182, 1896; 3006, 1905 



48, 1932, 1939 



22, 1924; 3, 1901 



17, 1900; 4,1895, 1897, 1936 



21, 1901; 1, 1915 



292, 1924; 93, 1901 



Note — The first column in the above summary gives observations 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 1939. 



