I started my second batch of chicks a bit early this year. They are now 8 weeks old and really need to get outside! I have a small coop and run set up for them outside within the big girls pen. Our temps are still getting down around 30 at night here. I put them outside today for a few hours while it was around 50 degrees and they seemed to enjoy it. I brought them back in tonight since it was getting down to 25 degrees tonight. What is the average low temp that would be ok for these chicks to stay out all night? Thanks!