If I’d been paying closer attention in Physics 12, I might know the answer to this question. We have a small pool in our backyard, and a small ocean about 10 minutes away. All summer, the Mediterranean has felt warmer than our little pool.
This seems counter-intuitive, because I’d imagine that, over the summer, the sun would heat up the relatively-small amount of water in our pool. The water and surrounding stone would store some of that heat over night, and so would get cumulatively warmer over the summer. That’s happened to some degree, but it’s no match for the ocean.
When I went swimming at Xlendi this morning, the ocean was bathtub warm. What gives?