Climate - Helsinki vs Stockholm vs Oslo (America, comparison, lows)

[Poiponen13]

How would climates of Helsinki, Stockholm and Oslo compare? They all have a continental climate (Dfb). I now throw off a few comparisons:

April high-mean-low:
Helsinki 8.1C/4.4C/1.1C
Stockholm 10.7C/6.3C/2.6C
Oslo 11.0C/6.2C/2.1C

December high-mean-low:
Helsinki 1.4C/-0.7C/2.9C
Stockholm 2.5C/0.6C/-1.2C
Oslo 0.8C/-1.4C/3.9C

Also, Oslo has coolest lows from June to December.

[MeesterJ]

I think you should just link the Wiki climate sections. It seems the Americans, which make up the vast majority here, dont want to look them up themselves :P