Doesn't matter; the plug temp is rated on engine-warm combustion temps.
OTOH, a spread gap on an older plug will be even harder to light up when the fuel coming in is cold.
I WOULD find an enclosed area out of the wind. And if it's down below freezing, I'd highly consider getting the mechanic to do it ... the extra price is my comfort fee for NOT standing out there in below freezing temps handling cold metal! 😈
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