The National Climate Prediction Center - This page is operated by The National Oceanic and Atmospheric Administration (NOAA) .  It provides nationwide weather data.

The Agribus.com Weather Page - This page provides a wide range of weather information, from current weather to long-range predictions.  The information is tailored to U.S. agribusiness.

The National Drought Mitigation Center - This page contains drought information.

UM Weather - This site is operated by The University of Michigan at Ann Arbor.  This is an excellent site that has comprehensive weather data as well as links to hundreds of other weather sites.