I went to a St. Louis Cardinals football game around 1967 at the then-new Busch Memorial Stadium (ugliest stadium ever built). I was about 16 years old and that was the coldest I’ve ever been in my life. It sounds like the same cold-snap you were at.
Luckily I wasn’t at the Ice Bowl as I was only four at the time. It’s been a legendary game told about many times and I’ve listened to it enough to think I was there but, alas, I was not
I’ve been cold before, -5 for a short time feeding the cattle and not sure about wind chill but I walked backwards to keep my face from getting frostbite.