Why is the sky usually cloudless in the morning?

Have you ever wondered why ....

... the sky is usually cloudless in the morning?

Clouds are formed when moist air is carried aloft by warm air currents rising from the earth's surface during the day.
When this air reaches high altitudes where the temperature and barometric pressure are lower than at the earth's surface,
the moisture comes out of the rising air and forms the water droplets we see as clouds. These clouds are very short-lived,
though, and they usually disappear within minutes after they are formed as their water droplets mix with drier air and
evaporate. Thus, during the daytime, clouds are continually being formed and then evaporated.

At night, when the surface of the earth cools, the cloud-producing process cuts off. The existing clouds continue to
evaporate, but they are not replaced by new ones. The result: cloudless skies in the morning.

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