We’re trying to obtain ERA5 data for May 2025. When we request data from May 1 to 31, 2025, the expver value returned from the CDS API is 005 (indicating ERA5T data). When we request data from either May 2 to 31 or May 1 to 30, the expver value returned is 001 (indicating ERA5 data). Is there a reason why we can’t request ERA5 data for all of May 2025?
Hi Jennifer, if you were running the request for 1-31 May several times (when only 005 data available), then you will get the same data back from the cache each time - even if the 001 data are in the archive. Changing your request slightly (e.g 2-31 May) means the data are re-extracted from the archive, so you get the 001 data for this request.
See How to avoid the CDS cache issue for a workaround and more details,
HTH
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Thank you, we will give the workaround a try!