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`date '+%m-%Y'`
[\\code]
But apparently boris is parsing out some special characters when building cron.

If this was working, you could simply generate a graph on a daily basis, as long as the month is the same it gets overwritten, but once the month is over, a new one would be created.

UPDATE --------------
Seems that reading the manual does help..
The concept is actually working, when using the right format, which is actually much simpler than what I was trying to do:
Create your monthly graph, with a timeframe actual month, save it.
Now define an upload schedule, in the filename field, you give it a name similar to: temperature_%m%Y.png

Every time the file is uploaded it is overwriting the previous version, but since it contains a month/year definition, it will always keep the last version of the month. Once we move to a new month, the filename changes (and prevents the previous one from being overwritten.

In this example I'm using a graph, but one can do the same with a file that contains some text fields, like monthly statistics.

Note:
Please do keep in mind that meteohubs statistics are not always completely in sync with the current time, since data aggregation is only done on a predefined interval.