My sister is awesome.
This morning she spotted my phone in the snow on the driveway. It was face down (like it is in the picture), so it was hard to spot.
I had driven over it at least once (it was in a tire track), but the snow cushioned it. We brought it in, wiped the snow off, and let it warm up. (I also dried it with my hairdryer, hoping that that would keep the snow from melting into the phone.) It's now on and working well. I have no plans to turn it off again anytime soon.