412 



CHARTS, GRAPHS, TABLES, AND COMPUTATIONS 



MM) Nn JiUr SEPT WV JM 



Month of the Yeor 



SO 

 300 

 290 

 2M 



no 



260 



2S0 



240 h 



230 



220 



210 



200, 



owo can 1200 



Hour of the Day 



2000 2400 



ono 1200 It 



Hour of the Doy 



Figure 9.12. Annual and diurnal cycles of Ns /or Colorado Springs, Colo. 



