just remember too, the wind isnt affecting your shanty cold wise, It might add extra pressure on the window making it crack. THe window itself is only going to be the exact temperature outside, the windchill doesnt matter. I have no Idea what you could do? Maybe try that huge clear tape they have, I know we use it at my work, its like giant scotch tape. Just tape the entire window, it will still crack but it will hold together.