I've been casting the last few nights with the temp around 25-35 and the only efect it has is to shorten the casting session or make me bundle up more. The sprues cool off quicker and the ingots should be kept in a pocket to warm up(or in the house) before dropping them into the pot. If you plan on water dropping them, make sure the top of the water is not frozen over, you will get funny looking marks on your bullets.
I use a Lee 4# pot to ladle cast on my porch. The wind can be a little problematic at times, but other than that, it works.
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