It's usually just people who have recently moved here or visitors it seems. If you've been here long enough you (should) know to be prepared/equipped.
Our first summer here (2001) we left the A/C off for a few days when we went to visit my parents back in California. We came home to dead fish in the fish tank because the water just got too hot. It can happen during that part of summer where it's 95º at 3am.
So from that we learned, never leave the A/C off during summer. Turn it up sure, but NEVER off. And always have enough water/protection when outside for however long you're going to be out there.
I'm in the Central SE, and we regularly get 85-90F in the Summer.
Today it reached 86F, with ~82%(outside)/~80%(inside) humidity. Nothing like Eastern Texas, but...
My exposed homework assignments have started to wilt
I don't do A/C until about 90F.