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In the archipelagos of the Bay of Bothnia, there is up to 65 cm thick fast ice in the north and up to 40 cm thick fast ice in the south. Along the western coast runs a lead of very open ice to the Quark. At sea, there is ridged and rafted, mostly very close ice that is up to 60 cm thick in the north and up 30 cm thick in the south. Along the fast ice in the southeast, there are areas of very open ice. In the Quark, there is up to 45 cm thick fast ice in the archipelagos and bays and at sea, there is 5–20 cm thick, very open to close ice. In the Sea of Bothnia and the Archipelago Sea, 5–40 cm thick fast ice or level ice is present along the coasts. In Lake Mälaren, there is 5–15 cm thick ice and new ice. In the Gulf of Finland, up to 50 cm thick fast ice is present in the easternmost bays. At sea east of about 27°25‘E, there is very close, 5–25 cm thick ice and mostly very open ice in the south eastwards from Luga Bay. In the archipelagos and bays along the northern coast, there is fast ice. In the northeastern Gulf of Riga, there is 10–20 cm thick fast ice or very close ice in sheltered bays.

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