Why are we more hampered by the weather than the rest of northern Europe? It rains in Denmark too. The climate in Southern Sweden is pretty similar to that of northern England/Scotland. (During my recent Christmas stay it rained pretty solidly all forthnight- yet my hosts kept dragging me out of health giving walks.)
As for my own teens:
dd (17), who has a long commute to college, spends one day of the weekend catching up on her sleep. She spends the other day doing youth theatre and catching up with friends, reading and planning plays, writing essays for college, writing to her penfriends.
ds (13) spends a lot of time roaming the town with his friends, playing football in the park, watching TV, listening to music. He used to hang out at the youth club but now prefers just being with his mates.
other teens I know do scouts, run their own bands, work in shops, volunteer in nursing homes
When I was that age I did similar things to my own teens- roamed the town, listened to music, read books, wrote to my penfriends. I also used to cook Sunday dinner on a rota with my brothers- no reason a modern teen couldn't do that.
The town I grew up in was far smaller than the one my own teens are growing up in, so there was less to get involved in.