winter wear for huangshan trip in mid Dec

In mid-Dec, will it be snowing frequently up on the mountain? Will the sun be out at the same time? I do not intend to buy down jacket but just a windproof padded winter overcoat (and the usual long john and layering), is this warm enough? If my gloves are not waterproof but wool/ fleece, is this fine? Also, can I just put on jogging track shoes with thick socks?
As I intend to take the train from Shanghai Putong Airport to Hangzhou when I first arrive, I'd like to know whether the train staion and train carriage (bullet train) is heated or not? Hope you can help.