Climate Data Online This link opens in a new window
Contains the National Climatic Data Center's archive of historical weather and climate data in addition to station history information. These data include quality controlled daily, monthly, seasonal, and yearly measurements of temperature, precipitation, wind, and degree days as well as radar data and 30-year Climate Normals. The NCDC is a part of the U.S. Dept. of Commerce's National Oceanic and Atmospheric Administration (NOAA).
Access note: to access datasets you may need to put them in a "cart" on the site. However, there is not a charge when you check out this cart.