I'm not an expert on the CS smokers, but that sounds like more than a weather problem to me. I can see where the weather would cause it to use more pellets to hold temp, but not keep it from getting to temp at all. You could try putting a blanket over it to see what happens. If it does get to temp with the blanket just make sure that the blanket doesn't start on fire! A welding blanket would be best.
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