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Since childhood, I have seen that whenever at night, the sky is cloudy, the sky becomes red. But, clouds are grayish, so it is expected that the sky becomes more darker. But no, it is not! Why does this happen? Is wavelength of various colours linked to it? I'm even not sure what tag to give!!

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    $\begingroup$ this thread should answer your question $\endgroup$
    – Jim
    Jul 3, 2015 at 13:03
  • $\begingroup$ I'm asking of cloudy skies.. $\endgroup$
    – Aneek
    Jul 3, 2015 at 13:04
  • $\begingroup$ How far into the night is this? Midnight? Dusk? Dawn? $\endgroup$
    – Jim
    Jul 3, 2015 at 13:09
  • $\begingroup$ Yes. At anytime between, say, 9 pm to 3 am $\endgroup$
    – Aneek
    Jul 3, 2015 at 13:20
  • $\begingroup$ Do you live in a city? $\endgroup$
    – Jim
    Jul 3, 2015 at 13:23

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The colour you see in the sky on cloudy nights is due to the reflection of city lights off the clouds. In rural areas, a cloudy night is, as you expected, significantly darker.

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However, the massive amount of light given off in urban areas reflects back to Earth when there is cloud cover.

enter image description here

And so, you see a red-orange hue, similar to the overall colour of the city lights.

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