I completely agree with the musical season things, I would say I agree with your choices too. My mind has gone a little bit blank at this moment in time, but I will be back with some kind of suggestion! ( ) by Sigur Ros is also an amazing winter album, (especially Untitled 1 and Untitled 3) You should also check out the video for Untitled 1 if you haven't already. Incredibly wintery, tragic, and beautiful
It's by Floria Sigismondi, If you google her there'll be a link to a video somewhere.