1919] 



VESTAL— PIIYTOCEOGRAPHY OF COLORADO 



179 



summer rainfall than the plains near the mountains; the distribu- 

 tion is similar, except that June is as rainy as May. 



The graphs for foothills and plains near the mountains are 

 repeated in fig. 14. These zones and the mountain-front have 

 maximum rainfall in May, with a sharp decline in June, followed 

 by slightly greater rainfall in July. Despite its less elevated posi- 

 tion, the mountain-front receives greater spring rainfall than the 

 foothills. 



Montane Zone 



Northern Foothills Northern Plains Near Mts 



Dry Plains Belt - --- Eastern Plains (Rain Belt) 



Northern Foothills 



-Northern Mountain-Front 



Northern Plains 



Figs. 13, 14. — Seasonal distribution of rainfall: fig. 13, comparison of north-south 

 zones; fig. 14, northern foothills, mountain-front, and plains. 



The data for the south are not so dependable as for the north, 

 for some of the few stations are exceptionally situated. The 

 contrast shown with the northern area is marked, however. The 

 rain is less abundant in spring and more abundant in July and 

 August than to the north. 



The graph shown for the "northern area" is a composite of the 

 3 in fig. 14, that of the "southern area" is a composite of those 



