Salt, there are at least two species of bats that are native to Newfoundland, so they must be adapted to winter over. We know they are common in other parts of the island that are further north, so the mystery is not their winter survival, only why they aren't commonly found here in the more southeastern part.
I don't think there is anything like a cave around here, where a bat colony would be snug for the winter, and that is the only reason that makes sense to me, why we don't have them.
OTOH I agree, the chances of one little bat on it's own are not great! The southeast eave of my house is probably the more sheltered place available to spend the winter, but it's going to be cold enough there in January, for sure.
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