I am experiencing cold temps also. Around 11 degrees as a high. I put 2 electric heaters in my garage to keep the temp somewhat avreage, around 55-60 degrees. That is to help the ARF's I have not built yet.
The fuel stays in a bedroom closet covered and not subjected to temp differences. I am not stating, put your fuel into a bedroom closet, but cold and radical temperature changes create water,condisation, and you don't want that. Keep your fuel at a constant temperature if possible, it will work better for you in the long run. Some people advise not storing fuel indoors, but if it's new, unopened fuel, I would say it's OK. Just My Opinion.