none. I do a lot of flying in the frigid temps and snow. I used to fly with the protective bubble on in the snow....but i stopped doing that a while ago.
Mavic is one tough bird.
My biggest trick for cold weather is to keep batteries warm until they are in use. Then i fly conservatively and try to land by 50%....which is usually not a problem because my fingers are froze by then. Also, a disposable hot pack on the back of the ipad helps keep that device alive in the cold.