I've lived in the Dallas metroplex my whole life and I think it's snowed at least once almost every year - but maybe sometimes for only 10 minutes or so. It almost always doesn't stick and isn't enough to make a snowman. You'll still see people try - they'll have these miniature, pathetic, grey, under-the-car-snow snowmen in their driveways.
Last year, I lived in Denton and we actually got about 7" of snow in March, it was very unusual. It had been in the 70's just a few days prior. They closed schools for 3 days even though everything had melted by the 3rd day.
You'll see that alot here too - people overreact BIG time to snowy/icy weather. But maybe for good reason: people here don't know how to drive on roads that are the least bit icy.
Dallas native, moving away for the first time soon and terrified of how much colder/snowier it will be