15 to 17 degrees Celsius (59 to 62.9 degrees Fahrenheit).
Ocean water, with an average salinity of 35 psu, freezes at -1.94 degrees Celsius (28.5 degrees Fahrenheit). That means at high latitudes sea ice can form. The average temperature of the ocean surface waters is about 17 degrees Celsius (62.6 degrees Fahrenheit). 90 % of the total volume of ocean is found below the thermocline in the deep ocean. The deep ocean is not well mixed. The deep ocean is made up of horizontal layers of equal density. If you want to know about the temperature of the ocean, you have to learn about the parts of the the ocean first. The top part of the ocean is called the surface layer. Then there is a boundary layer called the thermocline. The thermocline separates the surface layers and the deep water of the ocean. Much of this deep ocean water is between 0-3 degrees Celsius (32-37.5 degrees Fahrenheit)! It's really, really cold down there! There is a neat program that is measuring the temperature and salinity of ocean surface waters around the world. If you want to know about the temperature of the ocean, you have to learn about the parts of the the ocean first. The top part of the ocean is called the surface layer. Then there is a boundary layer called the thermocline. The thermocline separates the surface layers and the deep water of the ocean. Recordings have shown that the average temperature of water ranges from 0-3 degrees Celsius (32–37.5 degrees Fahrenheit). Back in 1899 it was estimated that 92% of the ocean floor had a temperature of lower than 40 degrees Fahrenheit. The average temperature of the ocean surface water is about 17 °C (62.6 F).. 17 °C. So even though surface waters can be a comfortable 20 degrees Celsius (good for swimming in!), the majority of our ocean water has a temperature between 0-3 degrees Celsius (32-37.5 degrees Fahrenheit).. 0-3 °C. The average temperature of the entire ocean surfaces usually ranges from 15 to 17 degrees Celsius (59 to 62.9 degrees Fahrenheit). There is a barrier between the surface water and deeper layers of the ocean that are not mixed. The barrier begins around 100 meters and can extend another few hundred meters downwards. The average temperature of the ocean surface water is about 17 °C (62.6 F).. 17 °C. So even though surface waters can be a comfortable 20 degrees Celsius (good for swimming in!), the majority of our ocean water has a temperature between 0-3 degrees Celsius (32-37.5 degrees Fahrenheit).. 0-3 °C. Sea surface temperature (SST) is the water temperature close to the ocean 's surface. The exact meaning of surface varies according to the measurement method used, but it is between 1 millimetre (0.04 in) and 20 metres (70 ft) below the sea surface. Air masses in the Earth's atmosphere are highly modified by sea surface temperatures within a short distance of the shore. On calm days, the temperature can vary by 6 °C (10 °F). The temperature of the ocean at depth lags the Earth's atmosphere temperature by 15 days per 10 metres (33 ft), which means for locations like the Aral Sea, temperatures near its bottom reach a maximum in December and a minimum in May and June. The constant motion of the ocean results in currents and waves that may either be warm or cold depending on the weather and temperature of that area. Temperatures in the ocean range from just around freezing at the pole and in the deep waters, to tropical clear waters that are as warm as a bathtub. The average temperature of all oceans is about 39°F (4&degC). Heat from the sun warms only the surface of the water.  Temperature. The temperature of the surface ocean depends on your location. In the tropics, the surface ocean temperature is 20-25°C all year long. In temperate climates, like Rhode Island, the surface water temperature can be 20°C in the summer and 5°C in the winter. Polar regions have colder water temperatures.  Deep ocean water makes up about 90% of the volume of the oceans. Deep ocean water has a very low temperature, typically from 0-3 °C (32-38 °F), and a salinity of about 3.5% or as oceanographers state as 35 ppt (parts per thousand). When deep ocean water is brought to the surface, it can be used for a variety of things. Its most useful property is its temperature. At the surface of the Earth, most water and air is well above 3 °C.
http://www.windows2universe.org/earth/Water/temp.html http://www.windows2universe.org/earth/Water/temp.html http://hypertextbook.com/facts/2007/LilyLi.shtml http://hypertextbook.com/facts/2007/LilyLi.shtml https://en.wikipedia.org/wiki/Sea_surface_temperature http://kids.nceas.ucsb.edu/biomes/marine.html http://omp.gso.uri.edu/ompweb/doee/science/physical/chtemp7.htm https://en.wikipedia.org/wiki/Deep_ocean_water
temperature range of the ocean