Environmental Science
The lowest temperature is usually observed:

Around sunrise
Several hours before sunrise
Several hours after sunrise
Near midnight
At the time of sunset

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Environmental Science
Infrared and visible satellite images might provide:

A way of distinguishing between "new" and "old" clouds.
A way of determining cloud thickness and altitude.
A way of distinguishing between wet and dry clouds.
A way of identifying clouds suitable for cloud seeding.

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