Hi. My husband and I are planning to ski at Yabuli Ski Resort from 1st to 4th January 2010. Would it be around -15 to -20 degree celcius around that time? It would be our first time skiing at sub-zero. I am a bit worry now as to whether we can 'survive' the cold weather there. Any practical good tips (besides those like wearing long johns, good jacket, ear-puffs, gloves and etc)? Thank you in advance.