Climate Data Sources : Climate Offices and Centers

(formerly the Earth System Research Laboratory)
Conducts research to improve observations, understanding, modeling and predictions of weather, water and climate extremes, and their related impacts.

(MRCC), National Climatic Data Center and Illinois State Water Survey
Serves the nine-state Midwest region (Illinois, Indiana, Iowa, Kentucky, Michigan, Minnesota, Missouri, Ohio, and Wisconsin) with research to explain climate and its impacts on the Midwest.

Midwest, Highplains, Northeast, Southeast, Southern and Western Regional Climate Centers

(formerly the National Climatic Data Center)
National Oceanic and Atmospheric Administration (NOAA)
World's largest active archive of weather data. NCDC produces numerous climate publications. Most popular products include: Climatological Data, Local Climatological Data, Monthly Climatic Data for the World, Hourly Precipitation Data, annual temperature/precipitation/degree day maps, freeze/frost data, snow normals, extreme weather events, etc.

Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison
Wisconsin climate resources including: Wisconsin Climate Watch, Wisconsin Seasons and Climate History.

To find other state climatology offices.