Proposed change

As mentioned by @frenck and @zweckj here, the rain count sensor(s) are indeed moving windows and thus should not use any state_class.

For my learning: I have checked the documentation about the available state classes, which explains that these should be chosen carefully and list intuitive examples for each of the different types, however it doesn't explain why it is important to chose the correct one and what effect this attribute has on the sensor's state. Could anyone explain this to me or have I missed the explanation somewhere?

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