Answer by RedGrittyBrick for How does an earthen pot keep water cool?

Latent heat of evaporation cools the pot in the same way it cools your skin. If the pot is then at a lower temperature than the water in it, heat energy will be transfered to the pot from the water in it by conduction.

Using plant xylem water for evaporative cooling, the desert cicada Diceroproctaapache can maintain a body temperature as much as 5°C below ambient(ra=42°C)