hi chuck,welcome and enjoy reading and posting topics.
The weather out of season can be hit and miss,it does get in the minuses in the evenings,but the days can be warm.Calis does receed a little in the winter but there is enough open to occupy yourself,but after the long hikes i think a book and a beer will see you through.
You will need to do a lot of research in order to capitalize on rental places,one because of the cost of buying in the right rental areas is not cheap and two the area is still expanding so what might be this years boom area is next years dead end place.
hope this helps and does not put you off too much