This map was created from a polygon feature class  that was converted from raster using a model developed at the University of Oregon and the resultant data, made available through the U.S. Geological Survey, was downloaded for use in the map. The data was projected using the North America Equidistant Conic projection, and the map displays precipitation values with a quantile classification method using five classes. I used a color scheme on this map that would show the varying quantities of rainfall across the continental U.S., with a gradient that would make it clear to the reader which areas have high rainfall and which have low rainfall. The bordering countries and ocean are not visible on this map to draw attention to the main area of interest and to avoid distractions.

Original map is 17 x 22 inches. Click here for full-size pdf.