Answer
The temperature of a body of water influences by surrounding temprature or the temprature of air which blows upon it.
Step-by-step explanation
If the temperature of air which blow upon the surface of water is high that time there will be transfer of heat from air to surface water due to which temperature of water body will rise. Similarly if the temperature of air which blow upon the surface of water is low that time there will be transfer of heat from water bodies to surrounding air due to which temperature of water body will fall.