So far, I feel like the weather has been very random. I opened a Temperate zoo in Franchise mode, and it snows in August (in Europe). And of course a lot of my animals were very unhappy. So do seasons exist? Am I just experiencing very strange weather in-game? If seasons don't exist, I wish they did -- because then I could do things to help my animals before winter and snow came in. I could shift them to the indoor part of their habitat and make them comfortable inside while waiting for the cold conditions to pass. As it is, it's a bit of a scramble.