Our 4 chicks are a month old now (2 BRs and 2 EEs). They're doing fine right now but I'm concerned they'll outgrow their digs before it's time to transition them outside. From what I've read they should be about 3 months before moving outside . . . but the box they're in is roughly a 30 inch cube. Will that still be big enough for 4 chicks at that age? I don't think I can fit a bigger box in my house; is it possible to move them outdoors sooner if the weather is really nice? What temps would be safe?