Dec-Jan-Feb 



Jun-Jul-Aug 



-15 



% 



10 



f calm j 



Grid Values 

 (wind distribution 

 in percent) 



Mar-Apr-May 



PORTLAND 

 1955-1964 



Sept-Oct-Nov 



Wind Speed Class 

 (knots) 



Figure CI. Direction and speed of seasonal winds at Portland. 



2-C-2 



10-80 



