What's the coldest weather you've walked a meaningful distance in?

[Sopranos Republican]

I believe it was 2006, and it was -43 F one late night in Vermont when my mom was driving us home, and going up the hill on our road, we hit ice/a massive pothole and began sliding backwards. We crashed into a snowbank, so me, my mom, and my brother who was like 5 at the time, had to walk to our nearest neighbor's house (about a half mile from where we were) to call my dad as there was no cell service in our area at the time. After this we invested in a vehicle with AWD.