Despite an earlier post DON’T get on I-30. The closest it gets to Denton is Dallas, which is also the closest it gets to Austin.
Heads up - I-35 is a terrible drive. The parts that aren’t bad are under construction. And traffic in Austin is horrible.
I’d consider going down through Lubbock and then cross country. Watch out for the small town cops.
As for weather - if you have a few days flexibility, it might make a big difference in road conditions. Once you get off the high plains, bad road conditions usually clear up in a couple of days. And the western route will get you south quicker. And you will miss the metroplex traffic - although Austin traffic can be worse.
Whatever you do, avoid the route through OKC this time of year. It’s longer, and it will greatly increase your chances of bad weather.
Here’s some material on I-35.
Specifically
http://www.my35.org/north/projects/default.htm
http://www.my35.org/central/projects/default.htm
http://www.my35.org/capital/projects/default.htm
Thanks so much. Really do want to avoid I35....and someone had suggested going thru OKC-—but that seemed so far out of the way ( and it is iced over today-—the reason for this vanity) I would rather drive off the beaten path (at 75mph !)