The European Centre for Medium-Range Weather Forecasts (ECMWF) is an international intergovernmental organization based at Reading in Berkshire, England that was founded in 1975. Its membership consists of 18 European states:
- Austria
- Belgium
- Denmark
- Finland
- France
- Germany
- Greece
- Republic of Ireland
- Italy
- Luxembourg
- The Netherlands
- Norway
- Portugal
- Spain
- Sweden
- Switzerland
- Turkey
- United Kingdom