“Published in a 1936 Atlas of American Agriculture, put together by the United States Department of Agriculture, these 1916 maps of the average dates of first killing frosts in fall and last killing frosts in spring were initially intended to help farmers plan their planting schedules. Now, the maps offer a rough gauge showing how much these dates have shifted over a century.
The preparers of these maps, William Gardner Reed, Charles Franklin Brooks, and F.J. Marschner, compiled data from a then-relatively-new network of Weather Bureau stations and agricultural colleges. The trio notes that of 4,000 such stations, 700 were able to offer data that covered every year between 1895 and 1914. Insets show dates of the first and last killing frosts in the year of 1914. ”
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