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The sun emits a variety of ultra violet rays that form a color spectrum. Different materials absorb these rays and others reflect them. Clouds, the sky and the oceans do not absorb the blue ultra violet rays and are refracted in the water molecules which is why they appear blue. Clouds appear white because of the sunlight that passes through them.

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15y ago
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12y ago

the darker clouds have more rain than evaporated water making it darker, some have less rain and more evaporated water. In some cases like a nimbo stratus cloud, it is very light but may contain lots of rain and lightning, this is because it has a lot of water content and evaporated water

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13y ago

It all has to do with the reflection of sunlight coming into the cloud from above. Darker (grey) clouds tend to be thicker with more water vapor and condensed water droplets, so they scatter more light away.

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8y ago

Clouds are not always white, when rain precipitates into the air it forms clouds and makes a blockage in the sky. When enough precipitation builds up the clouds turn a dark shade of gray!

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14y ago

when its dark it means u may have a storm or it may rain or sometimes even thunder and lightning. when its white it means its clear of any rain and you will probably enjoy a sunny day

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14y ago

Water vapor (clouds) diffuses and reflects all the wavelengths of light that our eyes are sensitive to, therefor the clouds appear white.

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13y ago

fog is a cloud and clouds is some time gray and some time white

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Q: Why is fog sometimes white and sometimes gray?
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