We have seen it as high as 18 oC
Equator.
Absolute zero, room temperature, boiling point of water, surface temperature of the Sun.
The warmest ocean is the Indian Ocean. The temperature of the surface water is sometimes as warm as 36.6 degrees Celsius. However, in the south, the waters become icy cold where the Indian Ocean meets the chilly Southern Ocean.
Lake Erie is the Greatlake that has the warmest water tempature!
The warmest/highest temperature something can get, or the warmest/highest temperature something can stand.
Hawaii.
Atlantic
In the Tropics. Shallow water will retain more heat than deeper water.
July is the warmest month on Mount Everest and the average temperature for the summit is -19 Celsius.
Still around body temperature, I would think.
Surface water has the highest salinity, however it is also the warmest, and because temperature has more effect on the density than the salinity, it rises to the top.
its about 80 degrees Fahrenheit there.