Physics
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly
Absorb heat from the atmosphere send it towards earth
Prevent cold waves from the sky descending on earth
Reflect back the heat given by earth
Produce heat and radiate it toward earth
Reflect back the heat given by earth
It is because the night side of Earth will radiate infra-red radiation (heat) back into space. When there is cloud cover, the clouds act like a blanket and trap the heat close to the ground just like a blanket traps heat close to our body.
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