I'm packing at the moment for five days in Copenhagen, what a mission!
Packing for Scandinavian weather is not an easy task. You see, there are so many 'if-s' to consider.
If it's hot, we all need at least two (well some of us probably more...) shorts/skirts each, if it's cold we will need two pairs of long trousers AND sweaters AND different shoes; and if it's rainy we'll need jackets... Because of course the weather here is not reliable at all. Even though it's been super lovely the last few days, it can change just as fast and rain for the whole stay.
So lots of if-s, and a near to full suitcase... :/