[Zambyte]

As you mentioned, electric bicycles flatten terrains (so do wide gear ranges), and jackets neutralize climate. There seriously isn't anywhere that is inappropriate to cycle. The only major limiting factor for people feeling comfortable biking everywhere is the threat of violence due to people driving cars.

[bluGill]

Lightening is another limit. I'm going to drive to work today because there is a 20% chance of thunderstorm when I'm planning to going home, and that is too much risk.

[jamwil]

Without studded tires it’s very difficult to ride a bike on snow or ice.

[aziaziazi]

Have you ever tried on snow ? Many bikers roams winter Finland and Russia without studded tires.

Avoiding the ice is a great advice indeed, with or without those tires.

[jamwil]

Actually no I can’t recall the last time I tried to ride a bike in the snow. But I know inherently that snow itself would be alright, but snow is almost always accompanied by a layer of ice below, which simply can’t be fine. This is the case in Canada at least.