The temperature of hot tap water should be around 50 degrees Celsius. For cold tap water, the temperature is roughly 7 degrees Celsius. These temperatures are estimates and vary according to season and geographical location.
The temperature of water that flows out of taps also depends on the storage facilities from which it is being dispensed. The water stored in natural reservoirs tends to have a lower temperature, especially in the winter. Underground water is usually warmer as the heat of the Earth warms the water. Tap water is a lot warmer in places located along the equatorial belt. In cold climates such as Canada, the average temperature of tap water is lower.