I agree. The number I usually remember is 55 degrees as a temp where a bunny is still comfortable. Without a draft, and blankets he may feel warmer than you.
If you give your bunny a small shelter in his cage, like an upside down cardboard box with a piece of towel inside, he can be totally out of a draft and snuggle on or in the towel like a blankie.
I have been thinking about you guys this week. We have more hurricanes here in FL (I’ve been here for several years and 4 hit in a 2 year period) and I always was glad to be hot when our power went out rather than cold. I am afraid of the conditions you are facing, so my thoughts are with you tonight. Don’t hesitate to get a hotel room miles away if they have power, though I know that’s probably not an option now. Have you ever used a space blanket, those tiny silver sheets they sell for camping? They work very well.
Stay safe. Wishing you all power soon.