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Other contributors have said "When does the morning dew come in in the morning?" is the same question as "Why there are dew drops on flowers in the morning?". If you believe that these are not asking the same thing and should be answered differently, click here.

Why there are dew drops on flowers in the morning?

Answer:

Answer

We only see dew in the morning because of the way dew forms. For dew to
form, air must be cooled to its condensation point. There must be little
movement to the air or it will remain mixed and not form dew, but will form
fog instead. (Fog is formed in other ways as well). These conditions usually
occur overnight, when the winds die down, and the air becomes still.
Radiational cooling from the ground or structures near the surface, such as
automobiles, mailboxes, etc. cools the air in contact with the ground or
structures. The humidity in the air condenses into droplets of moisture we
call dew.

After sunrise, the ground begins warm up and usually the wind increases.
Both these events warm the air and evaporate the dew.

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