EDIT by Chris: Here is the forcast for mid-trail according to NOAA:
Brrr! Our main days will be New Years and Wedensday, so you can see those are going to be cold. I fatefully said yesterday looking at our huge pile of warm stuff that it was too bad that we wouldn't really get to test these because 4-5 layers when it is in the 20s is silly. 4-5 layers when it is -15 is a different story!