THE RELATION OF CLIMATE TO POMOLOGY 229 



199. Climatic provinces of the United States.^ — While 

 chmate frequently vai'ies inarkecUy within comparatively 

 short distances, yet there are several grand divisions within 



REGIONS. BASED ON PERIODS 

 OF GROWTH AND REST' 



Fig. 31.— Length of growing season in different parts of the United 



States. 



the country which represent regions of similar climate. 

 These have been described as "climatic provinces," being 

 five in number. The largest, or Eastern, extends from the 



1 Adapted from Ward, Robert DeC. The essential characteristics 

 of U. S. climates. Sci. Month., Vol. II, No. 6. Dec, 1920. See also 

 Bailey, L. H. Principles of Fruit-Growing, New York. 2Cth Ed. 

 1915. p. 11. 



