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In the Bay of Bothnia, there is up to 70 cm thick fast ice in the northern archipelagos. In the north, east of the line Luleå - Kalajoki, there is 10–50 cm thick, very close and ridged ice. Outside the fast ice, there is very open ice and open water at the Swedish coast north of 64°20’ N and open water off the Finnish coast south of Kalajoki. Else, it is mostly ice free at sea. In the archipelagos and bays of Norra Kvarken and the northwestern Sea of Bothnia, there is rotten ice. In the Gulf of Finland, there is rotten ice in the eastern bays and outside 10–25 cm thick, open to very close ice drifts in places.

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© 2020 Baltic Sea Ice Services - Marina Kirchhoff (BSH Rostock/Germany)
Bundesamt für Seeschifffahrt und Hydrographie (BSH)