Do you want snow or not? Norway, Sweden and Finland are all cold and snowy this time of year. Athens is not warm, but it's still in the 50s-60s so nice enough to walk around during the day.
It is important to know for how long that trip may be. For weather reasons alone Athens can be a bit warmer than the Scandinavian countries, and possibly if you are lucky to have straight sunny days right through.
Anyway, even in bad weather it will be much easier to stay outdoors and you will have a better opportunity to see and visit a lot of sightseeing spots.
Try magnificent place in Greece in Thessally in the place Magnisia called Pylio Goggle " Tsagarada Pyliou" you will be surprised how much better is than Nordic countries :)
If you want fresh, unpolluted air, lots of snow and possible northern lights (not predictable though), nature and quietness, then Finland is ideal for you.
Athens for suree
