User blog comment:Darthkenobi0/Ask A Geek Deuxieme Parti/@comment-1376519-20100423034626

According to outside sources, water's specific heat is 4.184 J/degrees C, and since it needs this much heat in order to raise its temperature, it means that it will take a long time to heat up or cool down. This is why the ocean's temperature is warm in September and cool in March; the fall is right after summer, and all the water takes a long time to cool down because it has so much heat. In March, winter has just ended, and it will take a long time for the water to heat up again, since it needs a lot of energy to heat up...