How do clouds affect temperatures?

a they make them hotter.

b they make them milder.

c make them more extreme.

d they make them colder.

Effects of Cloud Cover: on forecasted temperatures. During the day, the earth is heated by the sun. If skies are clear, more heat reaches the earth's surface This leads to warmer temperatures. 
the answer i believe is A  

The answer to your question is A. They make them hotter.

A good example for this is that during the day, when there is sunlight, Earth is heated.  So what this means is that when we have clear skies, Earth absorbs the heat rather than the cold.

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Centration is the correct answer