I'm down in Louisiana. It gets hot here. Correction, it gets DAMN hot. So lots of people wear halter tops. However, as Tracy stated - they are a privilige, NOT a right. Some people down here feel that just because they live in the south, they need to look like Daisy Duke - WRONG. With nice khaki shorts, a cute halter looks nice. But with ass-shorts, it looks trashy.
Personally, I don't own any halter tops. I do, though, have two dresses with halter tops to them. But the dresses hit at the knee.
I like to leave things up to the imagination