PRISM is a set of monthly, yearly, and single-event gridded data products of mean temperature and precipitation, max/min temperatures, and dewpoints, primarily for the United States. In-situ point measurements are ingested into the PRISM (Parameter elevation Regression on Independent Slopes Model) statistical mapping system. The PRISM products use a weighted regression scheme to account for complex climate regimes associated with orography, rain shadows, temperature inversions, slope aspect, coastal proximity, and other factors. Climatologies (normals) are available at 30-arcsec (800 meters) and monthly data are available at 2.5 arcmin (4 km) resolution. PRISM is the USDA's official climatological data.
Generally, people in the climate modelling community are not familiar with ArcInfo ASCII Grid format and prefer to use netCDF. One approach is to convert to netCDF. One approach is described at: http://www.unidata.ucar.edu/mailing_lists/archives/netcdf-java/2006/msg00126.html
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|Average winter (Dec-Jan-Feb) precipitation in western Colorado based on the 800-m PRISM dataset. Units are mm water equivalent. Locations of popular ski areas are indicated. (credit: NCAR Climate Data Guide, D. Schneider)|
|PRISM 30-year normal precipitation amount in DJF and JJA (credit: NCAR ClimateDataGuide, D Schneider)|
|PRISM 30-year normal average temperature in DJF and JJA (credit: NCAR ClimateDataGuide, D Schneider)|
|PRISM 30-year normal precipitation climatology. Credit: http://www.prism.oregonstate.edu/normals/; retrieved 12 Feb 2014.|
|PRISM 30-year normal temperature climatology. Credit: http://www.prism.oregonstate.edu/normals/; retrieved 12 Feb 2014.|
|PRISM precipitation anomaly in January 2014. Credit: http://www.prism.oregonstate.edu/comparisons/; retrieved 12 Feb 2014.|
National Center for Atmospheric Research Staff (Eds). Last modified 23 Dec 2015. "The Climate Data Guide: PRISM High-Resolution Spatial Climate Data for the United States: Max/min temp, dewpoint, precipitation." Retrieved from https://climatedataguide.ucar.edu/climate-data/prism-high-resolution-spatial-climate-data-united-states-maxmin-temp-dewpoint.