8.5^ ^ 8.1 



8.0 



6.6 



8.7 8.6 



JULY 



7.1 8.3 



8.7 8.6 



AUGUST 



9.5^ ^9.8 



8.7 9.8 



10.8 



12.0 



9.0 



10.2 



10.4 



9.6 10.5 



SEPTEMBER 



a9 9.6 



OCTOBER 



Figuie 3. — Wind diagrams based on obseivaticxis from the Milwaukee, Wisconsin, Chicago, 

 Illinois, and South Bend, Indiana, U. S. Weather Bureau Stations, 1954. Lines 

 radiating from the center are directions toward which the wind was blowing. Per- 

 centage of time is indicated by the length of the line; die radii of the concentric 

 circles are in multiples of 10 p^cent. Numbers are average velocities in miles per hour. 



11 



