when there is a little bit of water in the air.
Dew won't form if there is no atmospheric moisture present (humidity of 0%), or if temperature is above the dew point for a given relatively humidity.
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Dew does not form when the air is very dry, with low humidity levels. In such conditions, there is not enough moisture in the air for dew to condense on surfaces. Dew also does not form in windy conditions, as it hinders the formation of a layer of still, cool air near the ground that is necessary for dew to develop.
Dew is less likely to form in arid environments with low humidity levels, as the air is drier and can hold less moisture. Additionally, dew is less likely to form in windy environments, as the movement of air can prevent the cooling needed for dew to condense.
Dew forms when the temperature drops to the dew point, causing water vapor in the air to condense into liquid water on surfaces. Dew may not form if the air temperature does not cool enough to reach the dew point, if there is insufficient moisture in the air, or if the surface is not conducive to dew formation (e.g., if it is warm or if there is strong wind).
Dew forms when the temperature of an object drops to the dew point temperature of the surrounding air. If the temperature remains above the dew point, or if there is not enough moisture in the air for condensation to occur, then dew will not form.
The dew point is the temperature at which air becomes saturated with moisture and dew or fog begins to form.
These are called dew drops. They form when the temperature of the surface cools down causing water vapor in the air to condense and form small droplets of water. Dew is more likely to form on clear, calm nights when the temperature drops close to the dew point temperature.