I said Sweden, not Denmark. But regardless Sweden's Capital of Stockholm actually has a lower temperature than Boston, while Copenhagen has roughly the same average temperature as Boston.

If you want another example, see how Montreal (a city a few hundred miles north of us) actually clears their bike lanes at the same time as they clear the streets: https://montreal.ca/en/topics/cycling-and-bike-paths

Again: IT'S INFRASTRUCTURE AND MAINTENANCE. You may personally be a wimpy car driver but there's plenty of people out there that will bundle up and walk, bike or transit if we fucking bothered to clear snow off our sidewalks and bike paths. Those people may be car drivers today who add to traffic when they'd be perfectly fine using an alternative if we bothered to build and maintain it year round.