Thats a good question. I have worked on boats outside when the windchill was probably -5ish. 15-20 without. Thats miserable, nothing works, and after an hour or so your done. Plus your hands stop working.

I recomend staying inside if at all possible, when its that cold.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200