Ocean waters absorb heat during the summer and release it during winter, reducing temperature differences between winter and summer and, in a similar way, between day and night.
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In the open ocean and along the shoreline, wind mixes the water around and brings water from the bottom of the ocean, which is cold and nutrient-rich, to the surface of the ocean.
Gentler summer waves deposit sand from offshore bars onto the beach, ultimately widening it and increasing its elevation. Conversely, stronger winter waves with more energy, pick up those particles deposited in the summer, and carry them back offshore in bars, thus narrowing the beach.
Above the ocean the air cools down due to the colder temperatures of the ocean water. This leads to the air becoming denser and a local high air pressure zone. The difference in air pressures above the beach and ocean is what causes the air movement we perceive as wind.
The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath.
The average temperature in Europe is 21.8°C. The highest current temperature on the continent according to our data, is in Koper (Slovenia) where water has 28.9 degrees celsius. On the other hand the lowest temperature is in Dalatangi (Iceland) where water has 12.1 degrees celsius.