My 7 week old chicks went outside on Christmas day. The temperatures have been 50 in the daytime and 40 in the nighttime for two days (Fri and Sat). I figured that was about right being as they had 50 degrees in the brooder prior to being moved outside. Sunday was a high of 50 and a low of 38, and Monday was a high of 40 and a low of 37. This morning they were doing great. Happy and chirping. So 37 definitely wasn't too cold. Tonight however they are calling for a low of 27. So I went over to check on them about 5 minutes ago. They were cuddled up as usual, snuggled all together on their shelf. Everyone (all 6 chicks) perked up when I opened the door and petted them. They were all warm under their feathers and showed no signs of stress, other than sleepiness. I used a temp-gun: the outside of the coop was 35, the shavings on the floor of the coop were between 35-40, and the shelf they were all cuddled on was 40-65 degrees (mainly from their body heat). So after my long tirade, my question boils down to this. What signs should I look for as to being 'too cold?' Thanks bunches!!