Courtesy of Oregon Climate Service (OCS) Maps from OCS server PRISM maps and data
Also see 1981-2010 PRISM Precipatation & Dewpoint Maps
For each option below, click on (*) for a more detailed map (file size may be much larger)
| Western States | Regional WRCC Maps | Regional WRCC Maps: Percent of Annual |
|---|---|---|
| Western US | Western U.S. | January |
| Alaska | Western U.S. (Oct.-Mar.) | February |
| Arizona (*) | Central Rockies | March |
| California (*) | Great Basin | April |
| California, Northern | Northern Rockies | May |
| California, Southern | Pacific Northwest | June |
| Colorado (*) | Southern Rockies | July |
| Hawaii (unavailable) | Southwest | August |
| Idaho (*) | Desert SW, Scale 1 | September |
| Montana (*) | Desert SW, Scale 2 | October |
| New Mexico (*) | Hawaii Island | November |
| Nevada (*) | Kauai Island | December |
| Oregon (*) | Maui Island | April-June |
| Utah (*) | Molokai & Lanai Island | July-August |
| Washington (*) | Oahu Island | October-March |
| Wyoming (*) |
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)
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.