The normals are baseline datasets describing average monthly and annual conditions over the most recent three full decades. They are our most popular datasets. The current PRISM normals cover the period 1991-2020.
Long-term average datasets are modeled with PRISM using a digital elevation model (DEM) as the predictor grid. Given their importance, the normals were subjected to extensive peer review. See PRISM datasets for more information; the data available from this page is "Norm91m" (normals). For information on when the grids were most recently updated, see calendar of PRISM data updates.
PRISM normals are available for Alaska, Hawaii and US Pacific Island possessions, Puerto Rico, US Virgin Islands, Jamaica, and western Canada from the Projects page.
Any known issues with the PRISM normals datasets are documented in the Known Issues section.
| Spatial resolution needed: | 4km (approx. 1MB per data file; 300KB per full-size image) |
| 800m (18-350MB per data file; 5MB per full-size image) |
| Climate variable: | |||
| Temporal period: | annual data | monthly data for | daily data for |
| Download Full-Size Image | Download Data (.bil) | Download All Normals Data (.bil) | Formats available Terms of use |
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| View/Download Metadata | Download Data (.asc) | Download All Normals Data (.asc) |
