52°F for someone used to living in a cold climate can still be quite pleasant but I find at under 50°F the amount of time I can spend outside without proper bundling shortens with each couple degrees.
11°C for someone used to living in a cold climate can still be quite pleasant but i find at under 10°C the amount of time I can spend outside without proper bundling shortens with each degree.
...means pretty much the exact same thing.
Canada and the UK have switched from the imperial system to the metric system relatively recently, and as such it is understandable that the imperial system is still entrenched in some areas (such as possibly cooking).
Most metric countries have been metric for centuries and use metric for basically everything, and certainly don't randomly use Fahrenheit of all things.
If your idea about Metric countries is Canada or the UK, then you don't really have an idea.