I have 11 babies they are black sex links and they are now 3 weeks old today. They seem to be doing well and was wondering when I can take them out doors. I live in Florida and our weather has been in the 60-70's this week. But the nights are in the high 30's to 60's so I am not sure if its safe to put them in the coop or pen area yet. When is it safe to do this?