Western Regional Climate Center

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Precipitation Maps

PRISM Precipitation Maps: 1961-90

Courtesy of Oregon Climate Service (OCS)     Maps from OCS server     PRISM maps and data

For each option below, click on (*) for a more detailed map (file size may be much larger)

Entire United States

Western States Central and Mid-Western States Eastern and Southeastern States Regional WRCC Maps Regional WRCC Maps:
Percent of Annual
Western US Arkansas (*) Alabama (*) Western U.S. January
Alaska Illinois (*) Connecticut (*) Western U.S. (Oct.-Mar.) February
Arizona (*) Indiana (*) Delaware (*) Central Rockies March
California (*) Iowa (*) Florida (*) Great Basin April
California, Northern Kansas (*) Georgia (*) Northern Rockies May
California, Southern Louisiana (*) Kentucky (*) Pacific Northwest June
Colorado (*) Michigan (*) Maine (*) Southern Rockies July
Hawaii (unavailable) Minnesota (*) Maryland (*) Southwest August
Idaho (*) Missouri (*) Massachusetts (*) Desert SW, Scale 1 September
Montana (*) Nebraska (*) Mississippi (*) Desert SW, Scale 2 October
New Mexico (*) North Dakota (*) New Hampshire (*) Hawaii Island November
Nevada (*) Ohio (*) New Jersey (*) Kauai Island December
Oregon (*) Oklahoma (*) New York (*) Maui Island April-June
Utah (*) South Dakota (*) North Carolina (*) Molokai & Lanai Island July-August
Washington (*) Texas (*) Pennsylvania (*) Oahu Island October-March
Wyoming (*) Wisconsin (*) Rhode Island (*)    
    South Carolina (*)    
    Tennessee (*)    
    Vermont (*)    
    Virginia (*)    
    West Virginia (*)    

Non-regional WRCC maps produced by Oregon Climate Service (OCS) and National Resource Conservation Service (NRCS)

Regional WRCC maps produced by WRCC from PRISM data set provided by Oregon Climate Service (OCS)

Published Articles

C. Daly, R.P. Neilson, and D.L. Phillips, 1994. A statistical-topographic model for mapping climatological precipitation over mountainous terrain. J. Appl. Meteor., 33(2), 140-158.

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