I know, I know, this is a newb question, I'm a little indecisive on this and just need a push. Haha. I've been checking ATweather.org and temps in SoCal have been around the low 40°s at night. I have zpacks 20° & 40° Bags. I am trying to decide between taking the 40° with base layers or the 20° and no base layers. I will have a light weight down jacket I'll be carrying either way.
Any advice is appreciated. I'm starting on the 21st heading north.