My chicks are six weeks old yesterday (minus two which are around 3 weeks old) and they're getting pretty big for their brooder. They're also making the house so stinky! I live in California so our winter isn't too harsh. Our days are around 55-65 and our nights won't drop below 40 until January or later, but they're still chilly enough I'd worry. When would you say is a good age to move them outside with those kind of temperatures?