The people that don't just aren't typical HN users. There is a very limited subset of people biking during the other half of the year and that's what I'm talking about - the world isn't only composed of young healthy people that don't carry anything and/or anyone and don't drive long distances and don't live in a hilly region and don't have to wear suit/dress to work (or have showers at work).

Saying "countries" is funny. It's varying wildly within a country, even a small one. E.g. my home city of Hradec Králové is built on a completely flat area with mild weather, so of course everyone bikes almost the whole year, but Prague is built on a series of steep hills and enjoys rougher weather, so while you see people biking here, most people don't.