Wondering how cold Sweden is to do a semester for. I like hot weather but really want to push myself away from my comfort zone. So was thinking to travelling to Sweden during my Erasmus, rather than the more popular Spain.

Can anyone tell me how hard it is to deal with the cold weather of Sweden?

The interesting thing, it doesn't really depends on what city you're in in Sweden! Compare different cities from this list https://en.needcalc.com/weather/sweden - you'll see that there's no much difference between them!
Of course, I would rather go to Spain There's a lot of things to see and you can pick every city you want. But it's up to you, of course.