* Arctic lakes and rivers: 32-41 °F (0-5 °C)
* Temperate lakes and rivers: 46-68 °F (8-20 °C)
* Tropical lakes and rivers: 68-95 °F (20-35 °C)
Saltwater
* Polar oceans: 28-32 °F (-2 to 0 °C)
* Temperate oceans: 41-59 °F (5-15 °C)
* Tropical oceans: 77-86 °F (25-30 °C)
The average global ocean temperature is about 59 °F (15 °C).
