About WeatherByCounty
Free climate data for every US county, powered by NOAA.
What We Do
WeatherByCounty aggregates NOAA climate normals — 30-year averages of temperature, precipitation, snowfall, and extreme weather days — at the county level for all 3,100+ US counties. Our data helps homebuyers, businesses, and curious residents understand the climate of any county in America.
Data Source
All climate data comes from the NOAA National Centers for Environmental Information (NCEI), specifically the U.S. Climate Normals 1991-2020. Climate normals are computed averages of weather variables over a 30-year period, representing a baseline of typical conditions.
Station-level data is aggregated to county level using spatial averaging of all weather stations within or near each county boundary.
Part of the ByCounty Network
WeatherByCounty is part of the ByCounty Network, a collection of free data sites covering property taxes, cost of living, crime, income, health, schools, environmental risk, and water quality for every US county.
Disclaimer
Climate data is informational only and represents historical averages. It is not a substitute for official National Weather Service forecasts, severe weather warnings, or emergency management guidance. Always consult official sources during weather emergencies.