In my area we're looking at the next week staying in the low 60's (the high) and mid 40's at night. My chicks are almost 6 weeks old and the ones that are a few day older are all feathered out. I have a very large fenced area for my 12 and have one open coopand one closeable coop. Will they be ok to start living outside? Or are they still to young and cold out?