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The fibers hold up in the cold , its the matrix resins you need to be concerned with. Typically , materials responses to cold are not the same as peoples responses to cold unless there is a significant amount of water involved. People are very concerned with 0 C because water freezes there and we are made of a lot of water but to other materials , temps in the range of 0C +/- 20-25 C are not usiually an issue but of course there are exceptions. I got to believe that the engineers designing the resins for these applications know it gets to freezing (o C) outside sometime.
I wouldn't worry about that too much.
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