The bigger issue is if it storms while you are hiking or camping on the mountain. Since the area is so high, what might just be light rain lower down can be icy and windy on the trail.
We were at Outpost Camp Sunday night when the storms hit. 3/7 ended up hiking down and spending the night in a hotel. 4 of us stayed at camp and ran into lots of ice and snow/hail above Mirror Lake. If I had never been on the trail before, I don't think we would've been able to find our way to Trail Camp.
