Archive datasets

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.

Map showing ECMWF Member and Co-operating States

Access for ECMWF members

ECMWF Member and Co-operating States NMHSs and their authorised users are granted access by their country's Computing Representative to list and download everything in the archive, including  special datasets, projects and research experiments.

Wind turbines

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.

Public access

The general public can browse and download the datasets that are made available free of charge. Terms and conditions may apply.