there is not-blown blue sky showing thru the trees, so perhaps that's just clouds. i doubt if i'd noticed, either. the pic i'd chosen for today has the same issue and probably a common problem, so maybe we can get some help.
My eye goes right to the snow falling! I like it! I am not proficient enough at PS to put a bit of blue into the sky, but I am sure that someone is. ginger (I think there may be some fringing there, too.)