U.S. Climate Normals

U.S. Climate Normals are 30-year averages of key weather variables like temperature, precipitation, and humidity, calculated to provide a reliable reference for typical climate conditions in a specific location. Maintained by the National Weather Service, these normals are updated every decade (e.g., from 1991-2020) to reflect recent climate patterns. They help meteorologists, farmers, and policymakers understand long-term trends, plan activities, and assess weather variations over time, offering a standard benchmark for assessing what is “normal” climate behavior in different regions.