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Note
titleERA-Interim production stopped on 31st August 2019

For

the time being and until further notice,

ERA-Interim (1st January 1979 to 31st August 2019)

shall continue to be accessible

access through the ECMWF Web API stopped on 01 June 2023

Its successor .  ERA5 is now available from the Climate Data Store (CDS) (What are the changes from ERA-Interim to ERA5?) and users are strongly advised to migrate to ERA5 (How to download ERA5).

For those users who still need access to ERA-Interim after 01 June 2023 (subject to further notice), they can do so via the Climate Data Store (CDS) API.


Through systematic increases of computing power, 4-dimensional variational assimilation (4D-Var) became feasible and part of ECMWF operations since 1997, paving the way to base ERA-Interim on 4D-Var (rather than 3D-Var as in ERA-40).

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