We are new to the chicken scene. We have four 2 week old chicks and two 3 week old chicks. They are still in a booder currently kept at 80 degrees. We had been letting them out in the yard with us for short periods of time even during their first week. Now that their coop and run is complete and predator proof we had started to leave them out there during the day. They really love it out there so I'd like to leave them there for longer periods of time...possibly full time within the next week. Yesterday it was in the upper 80s and very very humid. The chicks started out very energetic and happy like usual but after a couple of hours I became concerned by their behavior. They were just laying around kind of on their sides and seemed uncomfortable. They had food and water. I brought them back inside to the brooder. They all got together and went right to sleep. They were fine later on and seem great this morning. Are chicks unable to handle humidity? They are used to being in a warm brooder so I don't think it was a temperature thing. I read somewhere that chicks can't adequately regulate their temperature when it gets too hot. Thanks in advance for your input.