Monthly Summary 



March. 1931 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.40, 28th 



Minimum 29.22, 8th 



Mean semi-daily 29.904 



Range 1.18 



Air Teinperaiure 



Highest 58, 24th, 27th 



Lowest 18, 3rd 



Mean 36.3 



Monthly range 40 



Highest mean daily 46, 27th 



Lowest mean daily 29.5, 3rd 



Mean maximum 44.0 



Mean minimum 29.0 



Greatest daily range 30, 24th 



Least daily range 5, 4th 



PrecipKatioii 



Precipitation. In inches 3.79 



Snow, in inches 7.50 



Maximum precipitation in 24 hrs. 1.14 



8th, 9th 

 Number of days on which .01 or 



more inches of rain fell 11 



Wind (miles) 



Total movement 5,182 



Greatest daily movement .... 363, 26th 



Least daily movement 30, 1st 



Mean hourly velocity 6.9 



Maximum velocity for 5 min 32,18th 



Wind (direction) 



Prevailing direction nw 



North, days 7 



Northeast, days 1 



East, days 3 



Southeast, days 



South, days 2 



Southwest, days 2 



West, days 5 



Northwest, days 11 



Weather 



Mean relative humidity, per cent. . 67.4 



Mean cloudiness, per cent 65 



Number of clear days 11 



Number of fair days 8 



Number of cloudy days 12 



Number of hours bright sunshine 168.7 

 Percent of possible hours of bright 



sunshine 45.5 



30.60 



29.26 



30.02 



1.35 



63.9 



5.7 

 34.2 

 58.2 



3.68 

 8.11 



11 



5,738 



7.7 

 29 



75.0 

 51.0 

 11 



9 



11 

 201 



54.4 



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; 3, 1915 

 7,485, 1911; 3,006, 1905 



39, 1913 



86.8, 1916; 61.6, 1930 



68, 1901 ; 27, 1915 



22, 1924; 3, 1901 



17, 1900; 4, 1895 



21, 1901; 1, 1915 



292, 1924; 93, 1901 



None— The first column in the above summary gives observations made during the 

 month. The second column gives averages based on observations made from li^H9 to 

 U)L'«. Tlie third column gives extremes observed from l»8l) to 1930, 



