The featured map displays the three week change from 1 to 22 September of the average high temperature climatology based on the NCDC 1981-2010 dataset. One might use this map to explain where the fall season first arrives in the CONUS as the largest temperature changes are over the upper great plains. In general, the closer you are to major bodies of water, the slower the decline in temperatures will be. These water bodies have accumulated heat over the summer and they release it slower than surrounding land areas do. The opposite affect happens in the spring time as it takes longer for these areas to warm.

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