The number of bike lanes. Weather is less important:
Indeed, depending on how you judge what makes a city best for cycling, it’s often the colder ones that win out: Frozen Minneapolis is one of the best biking cities, thanks to well-built infrastructure and a bike share system. Rainy Portland continues to have the largest percentage of its population commuting by bike, a fact that should continue to shame city managers whose polities stay pleasant all year round.
Why more lanes may be necessary in the future:
By 2050, we’re going to see 3-4 times more global passenger mobility and we’re going to have to accommodate the transport needs of more than 9 billion citizens. Mass urbanization presents an amazing opportunity to get more people cycling: 30% of urban trips are less than 3km (1.86 miles) and more than half of all trips are less than 5km (3.1 miles).
The Dish 