USDA has a long-term partnership with the PRISM Climate Group at Oregon State University. PRISM is a technique that uses point data in conjunction with a digital elevation model to create gridded datasets of precipitation and temperature for the U.S.
PRISM Climate Data - Precipitation and temperature maps for the U.S.
Regional Climate Data
USDA Regional Climate Hubs - Information for adapting to climate change
NOAA Regional Climate Centers - Comprehensive climate data, information, and services by region.
By Region: Western | High Plains | Midwestern | Northeast | Southern | Southeast