When I did the original field study of this location I was dressed VERY warm. My boots were rated 175 degrees below zero. It took me a long time to find a pair of gloves from Cabella's that would keep my hands warm in these temperatures, but still give me some feel for handling the brush.
Something that amazed me was the visitors to the Grand Canyon out there at sunrise with me and wearing only a light jacket with no hat or gloves. I could over hear the different languages being spoken as I painted. Japanese, Spanish, French, German, etc.