Hi Blustone,
I live in Minnesota - We have large variations in temerature - it gets very cold in the Winter (-29 C) and very hot in the Summer (+38 C) here. I usually make one trip in the middle of the very cold Winter to a warmer place. I have found it much easier to breathe in the cold air than in hot and humid climates. The humidity and heat seem to exhaust me more quickly. I'm not sure where you will be traveling but if it isn't frigid (below -17 C) then you should be OK. I hope you have fun and stay warm!
Gabrielle