I was about to do it
Yes possibilities are aligned with capabilities offered by the API, that is to say from 30 minutes to current month.
If you need more, you will have to use persistence services of OH.
Thank you for the quick reply.
If I have understood correctly, what I have in mind is not yet possible. Or how can I change the start and end time by “rule”?
Based on API provided by Netatmo, this is not possible. You’ll have to create items to store each cumulative measurement of water accross the day, store it at midnight, and use persistence services to make calculation over let say a year.