WeatherData is based on a wide range of sources, with enhancement at the Wolfram Research Companies by both human and algorithmic processing. WeatherData is continually maintained with the latest available information, with automatic updating when WeatherData is used inside the Wolfram Language.

Among current principal sources for WeatherData are:

Citizen Weather Observer Program. "Citizen Weather Observer Program (CWOP)." »

Gladstone, P. "Locations of the Weather Stations of the World." »

National Oceanic and Atmospheric Administration. "National Weather Service." »

United States National Climatic Data Center. "Global Surface Summary of Day." »

United States National Climatic Data Center. "Integrated Surface Database." »

To report an error or suggest an addition to WeatherData, contact the Wolfram Research WeatherData team.