I looked up the city-data link vaskidmark gave for Jasper, TX; LR, AR; and Columbus, GA.
I know hot, humid, and miserable weather, from my time in LR, AR, and Col, GA. Jasper looks to be just as bad.
Dallas & points west is much more the "dry heat" than, "Dear Lord, I'm drowning in my own sweat!" heat, which is what seems to be the deal in Jasper.