Overnight condensation is a phenomenon that occurs when the temperature drops and moisture in the air condenses on surfaces. The term 'overnight condensation' is often used to describe the formation of DEW, which is a three-letter word (DEW). DEW forms when the temperature of the surface of an object falls below the DEW point, which is the temperature at which the air is saturated with water vapor. As the temperature drops, the air can no longer hold all of the water vapor, so it condenses on the surface of the object.