This is a hypsometric map showing the average annual precipitation in Arizona done by the Spatial Climate Analysis Service, Oregon State University. This map uses color to represent the third dimension of yearly rainfall averages for the state. The color choices really show up well making it easy to read and interpret. The mapper is using a very simple base map without any cities or towns to clutter the image. It looks like most of the state averaged below 20 inches of rain per year during the study period from 1961-1990.
If you click twice on the picture it shows up more clearly.
Link to website source:
http://www.asu.edu/lib/hayden/govdocs/maps/mapsites.htm
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