The Dutch live in a very small country compared to the U.S. I would suspect they mostly commute within the City and not from some far-flung suburb. That probably holds true here as well with most bike commuters commuting within the city or close by. I know there are exceptions, but for the most part I don't think there are an abundance of bike commuters pedaling in from distant suburbs, especially in winter. Don't get me wrong, I would love to see better infrastructure for bike commuting. In my state (Maryland) I think it would be fairly comfortable to commute for about 8 months of the year. Dec-March might be a challenge.