Evaporation is a cooling process because when a liquid turns into a gas, it requires more energy and must obtain it from its surroundings.
The energy is in the form of heat, and as the energy (heat) evaporates, the surrounding area cools.
Examples for evaporation causes cooling:
During the hot summers, the water in the earthen pot is usually kept cool. Water cools in the pot because the surface of the pot has large pores through which water seeps to the outside of the pot. This water evaporates and absorbs the vaporization latent heat, allowing the water inside the pot to cool.
During the hot summers, people, particularly in villages, frequently sprinkle water on the ground in front of their homes.
Water vaporization from tree leaves also cools the environment.