The annual average temperatures in the North Sea (left) and the Baltic Sea (right) deviated from the long-term average from 1997 to 2021 /bsh.de
According to the German Hydrographic and Maritime Transport Office (BSH), the temperature of the North Sea in 2025 was the hottest ever recorded. Compared to the long-term average from 1997 to 2021, it was 0.9°C warmer.
The BSH examines the surface temperatures of the North Sea and the Baltic S
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