From the website:
"Welcome to NCAR's GIS Initiative Climate Change Scenarios GIS data portal. This portal is intended to serve a community of GIS users interested in climate change. The free datasets of climate change projections can be viewed on-line and/or downloaded in a common GIS (shapefile) or text file format. Many 2D variables from modeled projected climate are available for the atmosphere and land surface. These climate change projections were generated by the NCAR Community Climate System Model, or CCSM, for the 4th Assessment Report of the Intergovernmental Panel on Climate Change (IPCC)."
From Richard Rood:
The site contains GIS friendly data, with downscaled temperature and precipitation data for the United States. The downscaling uses Parameter-elevation Regression on Independent Slopes Model (PRISM, see http://www.gisclimatechange.org/Downscaling.pdf ). The resolution of the downscaled data is approximaely 4.5 km.
The information at this site is from only one model - the Community Climate System Model.
The period for the historically downscaled data is 1870-1999; the period for the projections data is 2000-2099.
The projections are available for the A1b, B1 and A2 SRES emissions scenarios.
The data are available as monthly means, annual means, long-term average, or climate anomalies.
Note: There is information on many other variables directly from the Community Climate System Model - these are GCM raw model data and NOT downscaled data.
This resource allows access to only one downscaled climate projections dataset.