We would like to inform users that all ECMWF Products from the Real-time Catalogue now fall under the CC-BY-4 licence.
A clear attribution is legally required when using or sharing the data, whether accessed from our free data portal, via a Service Agreement, or from a third party.
Guidelines for attributing and citing ECMWF Products can be found here: Attributing and citing ECMWF data
A recommended format for the attribution is:
ECMWF IFS Forecast data, accessed from ECMWF’s MARS archive, © European Centre for Medium-Range Weather Forecasts (ECMWF), 2025. Licensed under CC-BY-4.0.
Please also note that users who redistribute or broker ECMWF Products are responsible for assisting users who access data via their services.
For any questions, please reach out to us via the ECMWF Support Portal.
ECMWF Support