21 F is not cold ! But different things happen at different temperatures. Condensation can be a problem below 0 F. Cheap petroleum based lubes may have waxes [parafin ] that precipitate and gum things up.Stainless steels eventually may cause a problem but Crucible's 416 R is good to at least -40 F.
Many in arctic conditions don't use lubes to avoid problems and never bring guns in and out of warm cabins to avoid condensation. Keep things clean and LIGHTLY lube !!
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And Watson , bring your revolver !
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