The sun's energy only reaches the surface of the ocean, and the deeper you get—from about 50-60 feet and onward—there's what is known as a “cold pool.” The sun can't penetrate the cold pool, so winter weather water remains in the deep ocean.
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It's courtesy of the sea breeze effect. National Weather Service meteorologist Walter Drag explains that it occurs due to the difference between the warm air over land and cool air hovering over the ocean (currently around 50 degrees).
Water has a higher heat capacity than soil and rock, so the ocean takes much longer to heat and to cool than the land. Coastal areas will generally have more moderate temperatures than inland areas because of the heat capacity of the ocean.
Why is the water in Florida so hot? Simply put, the rise in water temperature is due to a combination of things. Long-term changes in the earth's climate are a contributing factor, but so is the lack of wind on the surface of Florida's oceans, which is a side effect of climate change.
“Antarctic bottom water” is the coldest, saltiest water on the planet. These waters play a crucial role in the ocean's ability to act as a buffer against climate change by absorbing excess heat and human-caused carbon pollution. They also circulate nutrients across the ocean.
One, peninsulas are naturally warmer than mainlands because the adjacent water absorbs the sun's warmth and heats up the land it surrounds. And two, Florida's land is 75% coastal and as air moves across the warm water it picks up heat and water vapors, making Florida the most humid in the country.