Monthly Summary 



June, 1931 



Normal 



Extremes 



Barometer 



(Readings reduced to sea level) 



Maximum 30.27, 25th 



Minimum 29.51, 8th 



Mean semi-daily 29.941 



Range 76 



Air Temperature 



Highest 94, 20th 



Lowest 45, 3rcl 



Mean 66.7 



Monthly range 49 



Highest mean daily 80.5, 20th 



Lowest mean daily 58, 10th 



Mean maximum 77.8 



Mean minimum 55.6 



Greatest daily range 38, 30th 



Least daily range 7, 1st, 8th 



Precipitation 



Precipitation. In inches 4.24 



Snow, in inches 



Maximum precipitation in 24 hrs. 2.25, 



9th 

 Number of days on which .01 or 



more inches of rain fell 12 



Wind (miles) 



Total movement 3,704 



Greatest daily movement .... 217, 10th 



Least daily movement 55, 18th 



Mean hourly velocity 5.0 



Maximum velocity for 5 min 28, 21st 



(corrected to coiiforiu to M cup anemometer) 

 Wind (direction) 



Prevailing direction nw 



North, days 10 



Northeast, days 



East, days 



Southeast, days 6 



South, days 2 



Southwest, days 3 



West, days 



Northwest, days 9 



Weather 



Mean relative humidity, per cent . . 64.9 



Mean cloudiness, per cent 57 



Number of clear days 13 



Number of fair days 7 



Number of cloudy days 10 



Number of hours bright sunshine 251.7 

 Percent of possible hours of bright 



sunshine 55.0 



Thunder and lightning 20th 



30.31 



29.56 



29.961 



.75 



91.1 

 40.0 

 63.7 

 51.2 



3.54 



10 



3,584 



5 

 23 



73.9 

 50.1 



9 

 13 



8 

 257.4 



56 



30.54, 1889 

 29.24, 1902 



1.27, 1902; 0.52, 1916 



101, 1919 

 34.0, 1891 



9.68, 1922; 0.76, 1908 



17, 1922; 4, 1908 

 4,571, 1908; 1,409, 1906 



35, 1922 



85.9, 1922; 65.3, 1891 

 71, 1903; 28, 1908 



22, 1908; 1, 1907, 1926 



23, 1912; 4, 1895, 1903 



22, 1903; 1, 1923 

 362, 1908; 102, 1903 



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

 month. The second column gives averages based on observations made from iHtsi) to 

 19"2S. The third column uives extremes observed from 1881) to r.wo. 



