Just a quick update after a longer period of tests:
The “command completed” does not get triggered when the window closes automatically due to rain.
But: When you try to open a window via flow while it is locked due to rain the “command completed” does get triggered and the “successful”-tag will be “false”.
So I was able to implement a somewhat quirky workaround-flow to know whether it is raining or not.
So for me the topic is closed for now. 
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