I'd say 20-33 degrees is the typical range you are going to deal with on most days, so whatever you need to feel warm at those temps should be good with an additional layer available when it dips lower. I RARELY use anything more than a light base layer and non-insulated jacket an pants. I get crazy hot when I ride and would rather be cold on the lift then sweating like a pig. If it dips below 20, then I might where an additional top layer.
I tend to avoid the hill when it's raining so standard waterproofing works for me.