I have a minor amount of experience here, I'm running my ReallyBareBonesBoards at 3.3v 16mhz (overclocking, technically), and they start to crash randomly at 38*f, and lock up completely at 36*f. It sounds like more voltage allows colder operation, but if you're already at 5v there isn't much more you can give it before you're overvolting the chip...
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