Texas Mean Annual Precipitation (1981-2010)
Check out the most recent precipitation analysis for the state of Texas done by the the Oregon State University PRISM Team! It takes the mean rainfall over the 30 year period from 1981-2010 and overlays that information on a map of the state of Texas including county borders. This is a great resource for quickly referencing how much rainfall should be expected in one year for your area.
You can find more information about the OSU PRISM Team at their webpage: