Release of updated version of the ERA5 back extension data (1959-1978)

You may recall that in 2020, a pre-release quality control of the ERA5 back extension had revealed some problems affecting the performance in the tropics. We are pleased to inform our users that the Copernicus Climate Change Service (C3S) at ECMWF has now released an updated version of the ERA5 back extension data covering the period 1959-1978 in the Climate Data Store (CDS). For details, please refer to our article explaining the Changes in the ERA5 back extension compared to its preliminary version 

The updated version of the back extension has been added to the ERA5 catalogue entries:

For the time being, the Preliminary back extension data (1950-1978) continue to be made available to download from the CDS but will eventually be deprecated. The ERA5 back extension covering the period 1950-1958 will ultimately be updated and added to the ERA5 catalogue entries.

To download the ERA5 data, please follow our guidelines on How to download ERA5

A news article has also been published on the Copernicus Climate Change Service (C3S) website to mark the event: https://climate.copernicus.eu/c3s-updates-its-maps-without-gaps-1959-1978

Regards,

ECMWF Support

Preliminary back extension data (1950-1978) were deprecated in August 2023 and the data was physically removed from the Climate Data Store (CDS) in January 2024.