Thinking about how cold it would have been is making me hurt as I was cold when I woke up this morning and am rugged up now and it doesn't even get that cold here in the grand scheme of things XD
That purple light is magical, I'm really glad there's people like you that brave environments like this to bring spectacular shots to those of us who will never get to see it (in my case because I wouldn't brave those temperatures even if I had the means).
Glad you like it. I love being up in the mountains no matter how cold ;-)