Humid here and usually fairly warm, as alk8944 says as long as the caps are tight no problem. Rust is a big problem though so I have to be very careful with dies and anything “rustable”. I ended up partitioning off a portion of the garage and keep a dehumidifier running there.
On general principles I do not leave powder uncapped, or in the powder measure, except when using it.
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Ipsis Rebus Dictantitbus
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