Due to technical difficulties, 1979 data in both ERA5 monthly averaged data on pressure levels from 1979 to present and ERA5 monthly averaged data on single levels from 1979 to present is currently not available for download from the Climate Data Store (CDS). The CDS team is actively working at restoring access to this data as soon as possible.
We recommend that you watch this post as we will update it with additional information in due time.
We apologize for the inconvenience this may cause in the meantime.
Copernicus Helpdesk at ECMWF
