Ah! I think you could say it's capricious weather. A 'weather caper' suggests someone else carrying out a trick using the weather, not the weather itself playing tricks.
Yep :) I think this is a word order thing, though; the first word describes the second here, so if you want to describe the weather it needs to go second.
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Perhaps weather throwing a tantrum? Bitchy weather? Something like that...
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