You can keep chams outdoors almost all year in much of Florida. Your really only limited to panthers and veileds though, but there are some other members of Furicifer and Chamaeleo that would do well also. Below 45 degrees F in the winter is to cold for them and above 90 degrees in the shade in the summer is to hot so would have to stay between these temps. There is one member that I know of (Lizardlover, S.FL) who keeps some chams outside all year and many others such as my self, who keep chams outside 6-9 months out of the year.