On either the 2nd,or 3rd,of January in 2014 I spent the night in a small town about 200 miles north of Montreal.When I arrived (about 7PM) it was something like -20F according to my car's thermometer.When I hit the road about 7:30AM the next morning it was,according to the TV in the lobby,exactly -40C.
Curiously,it was that morning that I learned that -40 is where Fahrenheit and Celsius meet.My car thermometer said -40F and,looking it up when I got home,found that fact.
For me, it was February ~1975 in Calgary, Alberta.
I don’t know the temp, but it’s the coldest I have ever been.
Great people, though. With all the fleece-lined leather coats, cowboy boots, and Stetson hats, it felt like being back in Texas.