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An SQM isn't a weather station.
The darkest or 'best' SQM readings at my observatory occur during very severe storms. Yes with experience you can deduce some high light cloud with the SQM readings but I would not trust it to look after my gear.
There are a bunch of good true cloud sensing weather stations out there but none of them are very cheap I'm afraid. What's the setup you are looking to monitor or protect?
eg. Is this for your own curiosity or are you looking to make it part of a remote/automatic astro imaging setup?
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