Today, here in Calgary, Alberta, Canada, the temperature was -30*C (-22*F) but with windchill, it was closer to -50*C (-58*F). I don't think this is the coldest I've ever lived through, but it was close.
2. Where you live/where you have lived, what does it take, weather-wise, for things to start shutting down? Like schools and public transit and so on?
Everything was business as usual here today. I'm a teacher, and the school was open and most of the students were there. Growing up in a smaller town than Calgary, we usually had one or two snow days per year due to cold, but that was because lots of our students were bussed in from the surrounding countryside.