ECMWF's meteorological archive contains petabytes of operational and research data. Our Meteorological Archival and Retrieval System (MARS) enables you to list and retrieve those data in GRIB/NetCDF via:
- the MARS client on ECMWF computers such as ecgate
- the web API which can be used 'as is' or via our supported Python client software
- web interfaces where you can explore the parts of the archive available to you and get the MARS request syntax/scripts to download data on ECMWF computers or via the web API. Members and licence holders can also check availability of the data and estimate the download size.
Which of these you use will depend on who you are.
Access for ECMWF members
Non-member licenced access
Non-members can explore the datasets that are made available under licence, including those in the operational archive, and buy an archive data licence to download data using the Web API services.