Dew & Frost

Clear, calm nights, objects near the surface quickly cool. The surface and objects on it, often become much colder than the surrounding air. When the surrounding air comes in contact with these types of cooler objects and eventually cool to the dew point, saturation occurs. When water vapor begins to condense on them, dew or frost is formed. Dew is when temperatures are above freezing and frost (frozen dew) occurs when temperatures fall below 32 degree F.