I'm in the space between 2 tiny towns most people have never heard of, about halfway between Austin and Ft Hood. Our coldest temp so far was a drop to 18F for a night last winter.
Normally it doesn't get below about 25, but hey. Texas weather. You could be in shorts and flip flops for new years day, then bundled up in sweaters for Easter. I think we get about 4 weeks of winter, but they only show up a few days at a time. Winter exercise if hauling your post of tender perennials in and out of the house 2 or 4 times a week as the weather keeps changing.