Pennsylvania? Current temperature 4 degrees C? Guessing!
This will probably be a revelation to RU, I kept fairly quiet about it, but I moved mine outdoors in July last year. They're in the garage rather than a hutch, and there are two pairs not a solo rabbit. They seem to be doing fine and my life shows signs of slowly getting back to something other people might think of as normal . I'd wait for a warm time of year to put him outside.