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!!
Answer
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.
However, the massive amount of light given off in urban areas reflects back to Earth when there is cloud cover.
And so, you see a red-orange hue, similar to the overall colour of the city lights.
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