Stevie,
I would say it's prime time for keeping them outside.... Tomorrow morning I'm working on sprinklers on 4 more outdoor cages to do the same thing. Vegas is perfect right now for them. I currently have a Mellers chameleon outside, and have for a month. I just keep a ceramic heater on her at night, since it's in the 50's, then the daytime temps in the mid to high 70's work great. The best part about it (at least for me) is that you can drip water and mist NON STOP and it just runs off. The sun is great for them, and keeps them active and healthy. Panthers would be ok outside until the daytime temperatures are in the mid-80's, when they should probably be moved back in. Misting and screen shade will help in hot weather. Good luck!
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Tyler Stewart
Las Vegas NV
www.BLUEBEASTREPTILE.com