Firstly, Be happy, don’t worry! People who whenever lived in Siberia say “A Siberian is not the one who doesn’t feel cold but the one who wears warm clothes ” You are should dress multi-layered clothes with extremely low temperature, for example, on high mountains weather is very changing. Continue theme of mountains, you must use sundefen cream always to carry for your skin. Also I would advise you to surf whether forecast before you are going anywhere.