ERA5 data is no longer available through the ECMWF Web-API service. Access to ERA5 data is now from the Climate Data Store (CDS) only (interactively through the CDS web interface or programmatically using the CDS API service).

How is the ERA5 daily data organised in MARS?

In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree:

What would be the natural way to group requests?

The idea is to request as much data as possible from the same tape file (star) . The natural way to group requests would be:
all parameters, all levels, all time-steps for all dates of a month

(warning) Note: 'all' means 'all' that the user wants. It doesn't have to be all available parameters.

Useful links

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