U.S. Geological Survey

Climate-Vegetation Atlas of North America

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Figure 14

Figure 14. Histograms illustrating distributions of mean January, July, and annual precipitation, and moisture index (MI--moisture index equals actual evaporation divided by potential evaporation) among points of the 25-km grid for North America. The height of each column represents the number of grid points that occur within the specified range of the climatic or bioclimatic variable on the horizontal axis.


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