Monthly Summary 



May, 1937 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.36, 1st 



Minimum 29.66, 15th 



Mean semi-daily 29.952 



Range 0.70 



Air Temperature 



Highest 92, 31st 



Lowest 35, 16th 



Mean 59.3 



Monthly range 57 



Highest mean daily 73.5, 31st 



Lowest mean daily 49.0, 19th 



Mean maximum 71.8 



Mean minimum 46.7 



Greatest daily range 46, 3rd 



Least daily i-ange 9, 13th 



Precipitation 



Precipitation. In inches 6.09 



Snow, in inches 



Maximum precipitation in 24 hrs. 



1.66 14th 

 Number of days on which .01 or more 



inches of precipitation fell. ... 13 



Wind (miles) 



Total movement 3,382 



Greatest daily movement 191, 10th 



Least daily movement 51, 19th 



Mean hourly velocity 4.5 



Maximum velocity, 5 min., 25, 2nd 



Wind (direction) 



Prevailing direction nw 



North, days 5 



Northeast, days 2 



East, days 1 



Southeast, days 4 



South, days 4 



Southwest, days 2 



West, days 4 



Northwest, days 9 



W e a t b e r 



Mean relative humidity, per cent . . 65.8 



Mean cloudiness, per cent 59 



Number of clear days 11 



Number of fair days 9 



Number of cloudy days 11 



Number of hours bright sunshine . . 241 

 Percent of possible hours of bright 



sunshine 53.2 



Thunder and lightning 14th, 26th 



Frosts none 



Last Frosts 



30.38 

 29.51 

 29.95 



85.5 

 30.8 

 56.8 

 54.6 



3.63 



12 



4,540 



6.1 



25 



59.9 



51.5 



10 



11 



10 



250.1 



55.2 



12th 



30.55, 1895 

 29.18, 1893 



1.21, 1929; 0.60, 1899 



94.5, 1911 

 24.0, 1900 



7.44, 1931; 0.48, 1903 



20, 1901; 5, 1903 

 5,946, 1907; 2,180, 1894 



45, 1935 



70, 1901; 30, 1923 



20, 1923; 0, 1927 



17, 1907, 1926; 5, 1923 



20, 1927; 3, 1903, 1922 



334,1922:137, 1927 



June 8, 1932; Apr. 23, 1904 



Note— The first column in the above summary gives observations made dnring the 

 month. The second column erives the averages based on observations made from 18>'9 

 to 1928, except that humidity records are based on observations made from 1929 to 19:SG 

 The third column gives extremes observed from 1889 t« 198(i. 



