I have 4 chicks ranging from 4 - 6 weeks of age, all healthy. Is it too soon to put them outside for NorCal? (San Francisco) I have them in their sheltered coop which is protected from wind inside, but basically open to the outside air temp. Currently the temperatures is 65 degrees (at almost 7pm.) The low has been 57 degrees at night. Highs are 65-75*F during day.