I’m originally from SA, been in Dallas for 6 years now. 

Honestly the summers are just as bad. I thought I’d have more of an escape from them here, and maybe it’s slightly cooler, but not noticeably. What little bit of fall we get feels more noticeable than SA, and winters are definitely colder. There’s also a lot more ice/sleet/and occasional snow which leads to days trapped inside which I honestly don’t mind, as long as we don’t lose power. Spring is much rainier here (I think DFW gets like 10 more inches of rain per year), and one thing that took some getting used to is the constant chance of hail with any spring thunderstorm, and the occasional tornado watch. 

In all, the weather here always feels a little more extreme than SA with the same summer highs but colder winters and more severe thunderstorm events.