I would let it sit for a couple of hours. Really depends on where it came from. You said it's 48 degrees where you're at, but did the guitar come from somewhere warmer, or colder? I would also take into consideration where it was the last 24 hours. Was it in a UPS/FedEx wharehouse? If so, and it was loaded and delivered this morning, you're good to go. If it sat outside overnight, I'd wait a couple of hours.