B'coz water is a very good coolent i.e. it can absorb the heat from the object & gets evaporated..
exothermic
During a hot summer day, the sun heats up the surface of the pond, causing the water at the top to become warm. However, the bottom of the pond remains cooler because water is a poor conductor of heat and the sun's rays do not reach the deeper layers of water as effectively. This temperature difference creates a stratification where the warmer water sits on top of the cooler water below.
The sun heats the water surface. Warm water has a lighter density than cold water so the warmer water floats on the surface of the colder water.
To tell you the truth, if you think about, the clothes you wear are sticking to your skin making you feel hot. When you take your clothes off, it already makes you feel way cooler. Also, since the pool is usually cool/cold, that just makes you feel cooler on a hot summer's day.
It makes you sweat more and cools your blood
Rain water evaporates more on a summer day.
The water is cooler than the land and air sinks over the water
because a grove absorbs heat quicker than the beach, plus the water cools the sand at the beach.
It is cooler by an ocean on a hot summer day, Because water has a more equable temperature than land, it changes less. Coastal regions are relatively cooler in summer & warmer in winter than inland areas.
In office environments, it is thought that people gather around the water cooler to take a break from their day and converse with other workers. The phrase Water Cooler Humor refers to any funny discussions that may not be appropriate for the workplace, but would occur when people chatted at the water cooler.
the water is cooler than the land, and air sinks over the water. ~Apex
During the hot summer months they usually are abroad after dark when it is cooler. In cooler months they may be abroad during the day.