uhm from May/June untill August. but as long as the temperature is right the chameleons stay outside. We have montane species who can handle quite some cold nights. We also put panthers and other species outside in flexariums and those cages. The best thing about keeping animals outside is that they build enough vitamin D3 because of the amount of UV they get, to spend the winter. If you put your animals outside for 2-3 months in summer, they hardly need UVb in winter, still they all have UVb light here, but the chance on MBD and such isn't there.
Awesome! I spent a year in the Netherlands (Apeldoorn) and it was awesome. About the same kind of weather as in Chicago (but I don't remember it being that snowy...).
(um....nice side veiw of the snowlady by the way....)
Nice! We've had just a dusting of snow; not nearly enough for a snowman (or woman, or chameleon) yet, and too cold to stick together if we did have enough.