On Thursday, Day 6, we crawled from our toasty sleeping bags into freezing air. It hailed a bit at breakfast. A 40% chance of thundershowers was predicted. After a futile foray to try to find another battery for my camera, we strolled to the shuttle stop in the hail/snow and started our tour of the rim. Delightfully, the sun came out and we strolled the rim trail in pleasant weather. But by lunchtime, freezing winds and hail/snow had driven everyone back into the shuttle buses. With white-out conditions in the canyon, we bought a hot lunch indoors and then went to Tusayan to watch the IMAX Grand Canyon film.