FMI Sea Ice Outlook for the Baltic Sea | Arctic Regional Climate Centre Network

Ice formation has started in the northernmost Bay of Bothnia and in sheltered bays there already is level ice up to 10 cm thick.
The water temperature in the central Bay of Bothnia is over 3°C.
Water temperatures in Sea of Bothnia are 3°…6°C.
In the Northern Baltic Proper, water temperatures are over 7°C.
In the Gulf of Finland water temperatures are in the range 1°–7°C.

Along the coasts of Bay of Bothnia and off-shore in northern part, 5–20 cm thick ice and thin new ice. In Vaasa archipelago, ice is forming in sheltered bays.
2-10 cm thick ice in the easternmost parts of the Gulf of Finland, otherwise new-ice formation in the archipelago of the eastern Gulf of Finland.
The water temperature in the central Bay of Bothnia is over 1°C.
The water temperature in the central Sea of Bothnia is over 3°C.
In the Northern Baltic Proper, water temperatures are over 6°C.
In the Gulf of Finland water temperatures are in the range 1°–5°C.

The central parts of the Bay of Bothnia are still ice free. Otherwise the Bay of Bothnia is frozen and ice occurs along all shores of the Northern Baltic Sea.
In northern Bay of Bothnia, 20–50 cm thick ice. In central parts 5–30 cm thick ice.
In the archipelagos of the southern Bay of Bothnia and the Quark, 10–30 cm thick ice.
In the central Quark, thin ice.
Along the coasts of the Sea of Bothnia, 5–20 cm thick ice.
Thin ice in sheltered parts of the Archipelago Sea and the archipelago of the western Gulf of Finland.
In the central Sea of Bothnia and central parts of the western Gulf of Finland, water temperatures are in the range 1°–4°C.
In the Northern Baltic Proper, the water temperature is over 3°C.
In the eastern Gulf of Finland, 5–30 cm thick fast ice, and thin ice in central parts.

Next update to the forecast will be issued in January 2023.
Contact: Finnish Meteorological Institute, Ice Service — iceservice@fmi.fi
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