The city doesn't plow the sidewalks and bike trails, at least not until the roads are passable. First priority is emergency services and highway connections to the outside world, not shovelling out bike trails through the woods. Even then, we drive on compact snow for 1/3 the year.
> you just need the infrastructure to let you do so
Yes, if your city treats cycling as an afterthought, it will be less practical to cycle. If your city treated driving as an afterthought, it would be less practical to drive. You get what you build for and what you prioritize.
> Even then, we drive on compact snow for 1/3 the year.
Oulu has snow for half of the year and still has a substantial cycling mode share, because they prioritize it: https://youtu.be/s3Sx_OH_wok
Lots of alternative transport things are possible in cities with 10x the population and 4x the urban density. And little farming/agra business. In a country one can drive across in a day. There is no comparison to the middle parts of North America.