If that's the video I'm thinking of, it's referencing Finland, where people bike all year because the bicycle infrastructure is well maintained. Try driving in

If that's the video I'm thinking of, it's referencing Finland, where people bike all year because the bicycle infrastructure is well maintained. Try driving in -20 on unmaintained roads, and you'll find the same thing as your current statement about biking. The temperature is largely unrelated to the infrastructure's useability