The Baltic Sea is the worlds largest water area with a low
percentage of salty. You can sail the Baltic Sea yearly six months from
May to October, the whole of ice-free season.
The nights are light and the Sea is cold in springtime and much
more warmer from July to September. The Sea is also rather shallow.
There is no tide, but hard winds are making the seawater to rise or lower
depending of the wind direction. However you have to pay attention to
hard storms that usually take place in the autumn season.