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Open Data Roadmap
















Transition to Open Data

As part of its strategy and ongoing commitment to open science, ECMWF progressively moved towards an open data policy since 2018. ECMWF achieved a fully open data status on 01 October 2025. All products in the ECMWF Real-time Catalogue are now under a CC-BY-4.0 licence with no Information Cost. A large subset of this data is made freely available, while the remaining parameters may be subject to service or delivery charges (where applicable). 

Provision of ECMWF data and products is governed by the ECMWF Product Distribution Rules, available here:


ECMWF Product Distribution Rules


Progress and Milestones

ECMWF made significant strides on its pathway to open data:

Enhanced Data Accessibility: Expansion of data services to provide more user-friendly access. Open data is available directly from ECMWF or via public cloud providers, and there are several open tools to support data use and interpretation. 

Adapting to User Needs: Recognising users' diverse needs, data is now available in various popular formats, including charts, web interfaces for data download, and API options. This adaptability facilitates easier integration and use of our datasets across different platforms and projects.

Free to Use, Thoughtfully Served

While our data is freely accessible, delivering it is not without cost. The nature of meteorological data—large, complex, and continuously updated—poses substantial challenges for managing volumes, ensuring timely delivery, and maintaining our operational requirements that are part of the ECMWF Convention. ECMWF continues to review the current free and open data to ensure it meets users' needs. 

The Timeline







Available Open Datasets 

ECMWF Open IFS Data

ECMWF Open AIFS Data

S2S Data (sub-seasonal range)

TIGGE Data (research ensemble)

ERA5

ECMWF Seasonal Forecast via the Climate Data Store

















Forecasts

Open Data Roadmap

Access to real-time open data

Access to archive datasets

Service agreements and use cases

Data pricing

Ordering

Registration vs anonymous access






Available Open Datasets 

ECMWF Open IFS Data

ECMWF Open AIFS Data

S2S Data (sub-seasonal range)

TIGGE Data (research ensemble)

ERA5

ECMWF Seasonal Forecast via the Climate Data Store








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