114 



N CLIMATOLOGY 



Figure 4.18. Diurnal, seasonal, and vertical variation 0/ No/or San Diego, Calif. (SAN). 



smaller seasonal, diurnal, and vertical ranges as illustrated by Portland, 

 Me. (PWM), figure 4.22. The curious low in late autumn appears to be 

 the result of advection of air from the continental interior and is perhaps 

 indicative of the Indian summer of New England. The long New Eng- 

 land winter appears in the surface data as a large area of nearly constant 

 No. 



The above data reflect the south-to-north change from humid sub- 

 tropical to marine-modified continental climates typical of the lee coasts 



