MONTHLY SUMMARY 



March 1939 



Normal 



Extremes 



Barometer, in inches 



(Readings reduced to sea level) 



Maximum 30.56, 8th, 19th 



Minimum 29.41, 6th 



Mean semi-daily 30 078 



Range 1.16 



Air Temperature, in degrees F. 



Highest 5\ 24th 



Lowest 4,11th 



Mean 30.^ 



Range 55 



Highest mean daily 45.5, 6th 



Lowest mean daily 14.0, 1 1th 



Mean maximum 38.9 



Mean minimum 23.0 



Greatest daily range 31, 24th 



Least daily range 4, 30th 



Precipitation, in inches 



Precipitation 4.49 



Snow 20.0 



Max precipitation in 24 hrs.. 1.02, I5th 16th 

 Number of days with 01 or more 12 



Wind, in miles 



Total movement 4994 



Greatest daily movement 478, 7th 



Least daily movement 52, 5th 



Mean velocity 6 7 



Maximum velocity 48, 7th 



Wind, direction 



Prevailing direction NW 



North, days 10 



Northeast, days 



East, days 



Southeast, days 2 



South, days 4 



Southwest, days 1 



West, days 3 



Northwest, days 11 



Weather 



Mean relative humidity, percent 69 1 



Mean cloudiness, percent 48 



Number of clear days 15 



Number of fair days 7 



Number of cloudy days 9 



Number hours bright sunshine 217 



Percent of possible hours of bright 



sunshine 58 



Thunder and lightning 



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, 1014; 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 



22, 1924; 3, 1901 



17, 1900; 4, 1895, 18)7,1936 



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 1938. 



