I think the "more southern" part of Europe applies here. It's probably about "not being covered in snow for most of the year" which helps cyclists. Yeah, you can use bicycles on snow, but it's not pleasant. Most people hide their bicycles for winter and I'm south from Sweden.
Hmm, I've seen plenty of biking infrastructure un Umea and Lulea (including heated bridges that are used in winter), not to mention people using them even in colder times. It seems not all your countrymen agree with your thinking about winter biking.
Of course not everyone agrees. I see someone on bicycle almost every day, but those are either very dedicated cyclists or those who have no other means to move faster than walking but still need to.
Heated bridges? I've never seen one and roads are not even fully desnowed in my town.
