I keep temps right around 84 in the middle zone. Its about 90 in the hot zone and can sometimes (rarely) dip into the high 70s on the cold end. All zones of the enclosure get used at some point throughout the day. But he typically hangs out in the middle zone
I agree with not keeping temps below 80 for hatchlings and juveniles, adults may be able to dip into the mid- to high 70's. My cool, dark side is 81.5 in the day and 80.5 at night. The warm bright end is 85 in the day and 82 at night.