It's no big secret that places that have the most bike infrastructure also have the most riders.
Some things I noticed on my travels:
I've visited The Netherlands/Holland a few times during different times of the year.
Mild winters and summers; at least compared to where I live and work - NYC area.
https://www.youtube.com/watch?v=ZPHI...IoDLA&index=69
Spent 3 weeks in China, mostly Nanjing and Shanghai. Very hot summer;
maybe that's why a lot of people are using electric mopeds instead of pedaling bikes:
https://www.youtube.com/watch?v=fi01...6zPoymgKaIoDLA
Spent a few days in Puerto Rico, mostly San Juan. Hot caribbean climate, no bike lanes/paths.
Not too many riders except for some roadies and fixie riders:
https://www.youtube.com/watch?v=Jea4...6zPoymgKaIoDLA