The Cities Impacts & Adaptation Tool (CIAT) is an online climate adaptation planning support tool for decision makers at the municipal level in the Great Lakes region. The site provides  local-scale data for cities with populations of 20,000 or higher, including current and projected climate trends, demographic and socioeconomic data, and descriptions of adaptation strategies pulled from existing planning documents for municipalities across North America. For any city in the database, the tool identifies a custom network of "climate peers" through an interactive map interface. Climate peers are cities whose current climate reflects the selected city's projected climate in 2041-2070.