you'd be surprised that CO isn't really that cold. i grew up in Pa and Nj and we dont' have the grey overcast winters like back east. i'm at almost 9000ft and i can be outside in a tshirt if it's sunny and in the 30's. don't tell anybody though. lol. trying to keep our mild winters a secret. i'm actually in what's called the Banana Belt of CO because of the milder temps. some areas do get cold as shit like the san luis valley near alamosa. routinely in the -20 to -30 range.