Asia sea temperatures
The sea waters of Asia range from the some of the hottest to the coldest on Earth. The equatorial waters of South East Asia are rarely colder than your bath tub and most of the Indian Ocean is warm throughout the year.
On the other hand are the Arctic waters of Siberia which remain near freezing year round.
The greatest variance in temperatures occurs in the temperate regions, in particular Japan where the variation in the Pacific Ocean's temperature can be greatest.