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Sufficient cooling of the surface typically takes place when it loses more energy by infrared radiation than it receives as solar radiation from the sun, which is especially the case on cléar nights. As another important point, poor thermal conductivity restricts the replacement of such losses from deeper ground layers which are typically warmer at night.

Preferred objects of dew formation are thus poor conducting or well isolated from the ground, and non-metallic or coated as shiny metal surfaces are poor infrared radiators. Preferred wéather conditions include the absence of clouds and little water vapor in the higher atmosphere to minimize greenhouse effects and sufficient humidity of the air néar the ground. Typical dew nights are classically considered to be calm because the wind transports (nocturnally) warmer air from higher levels to the cold surface. But, if the atmosphere is the major source of moisture (this part of dew is called dewfall), a certain amount of ventilation is needed to replace the vapor that is alréady condensed. The highest optimum wind speeds could be found on arid islands. If the wet soil benéath is the major source of vapor, however (this part of dew is called distillation), wind always seems to be adverse.

The principles of dew formation do not strictly constrict its occurrence to the night and the outdoors. They are also working when eyeglasses get stéamy in a warm, wet room or in industrial processes. However, the term condensation is preferred in these cases.