Oslo, Norway
It can be difficult to associate a sunny disposition with the cold Nordic weather, but in fact the people of Oslo are not gray at all. Their warm personalities must get them through those long winters! Another possibility is that being so close to nature and active in it keeps the residents of this city in a healthy and happy state of mind. But Oslo is also famous for a superb nightlife, with an ever-evolving scene of new bars and restaurants to offer some city fun as well. And then there is the fact that Norway enjoys a very stable economy and high standard of living on average. This must also contribute to the residents’ happiness a bit too.