We've traveled with different kinds of roof top tents all over Scandinavia and primarily during fall and winter. From our experience the wind is seldom a challenge. Usually you will find some kind of shelter behind a hill, in a forest or something like that during a storm. I wouldn't recommend being right on the beach on the west coast of Denmark during a storm though - but that also applies if you aren't staying in a roof top tent ;)
How practical is a roof telt in Danmark because of the strong Wind
We've traveled with different kinds of roof top tents all over Scandinavia and primarily during fall and winter. From our experience the wind is seldom a challenge. Usually you will find some kind of shelter behind a hill, in a forest or something like that during a storm. I wouldn't recommend being right on the beach on the west coast of Denmark during a storm though - but that also applies if you aren't staying in a roof top tent ;)