US Precipitation Map
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About the map
How much rain falls in the United States? Take a close look at this US precipitation map to see where it falls the most and least.
The first thing you’ll notice is that precipitation varies widely across the United States. If you look at somewhere like Death Valley in California, there is as little as 2.3 inches per year. But Mount Waialeale in Hawaii receives the most precipitation at a high of 460 inches!
At a state level, Nevada is the driest state with an average annual precipitation of 9.5 inches. But the islands of Hawaii are the wettest in the United States receiving as much as 70.3 inches of rainfall.
 Precipitation Map of the United States |
 United States in Google Maps |
Data Source
The average annual precipitation data for this map layer were produced through the Natural Resources Conservation Service (NRCS) and the Spatial Climate Analysis Service at Oregon State University (OSU).
The PRISM Climate Mapping Project gathers climate observations from a wide range of monitoring networks. This US precipitation map shows polygons of average annual precipitation from 1961 through 1990.
Hey can you point me to the underlying data set for rainfall please?
I updated the article. It’s PRISM climate data at Oregon State University.