Even though surface water can be quite warm, most of the water in the oceans is deeper, colder water, so that the average temperature of the entire ocean is about 4 o C, which is roughly the temperatu...Even though surface water can be quite warm, most of the water in the oceans is deeper, colder water, so that the average temperature of the entire ocean is about 4 o C, which is roughly the temperature inside your refrigerator. In temperate regions, the surface water is much warmer in the summer and the thermocline is more pronounced compared to the winter months.
