I always leave cold. But, when you leave at 2:30 am from the car(freezing), and you are coming back in the heat of a summer day(very hot), you got to have layers(or schoeller, or something). Plus it's colder when your standing on a glacier(if theres a breeze), and when your hiking back on a trail it is much warmer.
Whats really cute is when the gaitors are on too! YEAH!!!!