It stays below 90. Due to the size of the space and plants housed out there, it really never gets above 87 degrees. I have gone to the link you attached, many, many times. It is truly a wonderful resource. My hope is to allow him to "free range" out there. It seems to meet all of the requirements, and I think he will be much happier. I rescued him from a really gross pet store in LA. He was living there in a 20 gall tall glass aquarium. I purchased the largest screen cage avail. and he has done great in there. I just think he needs even more room.