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What is the temperature in the North Sea in January?

What is the temperature in the North Sea in January:

The daily high temperature drops by 1°C, from 19°C to 18°C, rarely falling below 13°C or exceeding 23° C. The daily minimum average high temperature on January 26 was 18°C. The daily low temperature is around 14°C, rarely falling below 9°C or exceeding 19°C. The daily minimum average low temperature on January 22 was 13°C.