UPSC Prelims 2019·GS1·geography·climatology

Why are dewdrops not formed on a cloudy night?

Dalvoy logo
Reviewed by Dalvoy
UPSC Civil Services preparation
Last updated 23 May 2026, 3:31 pm IST
  1. AClouds absorb the radiation released from the Earth's surface.
  2. BClouds reflect back the Earth's radiation.Correct
  3. CThe Earth's surface would have low temperature on cloudy nights.
  4. DClouds deflect the blowing wind to ground level.

Explanation

Dewdrops are not formed on cloudy nights because clouds act as a blanket, reflecting back the Earth's longwave radiation (heat) towards the surface. This prevents the ground from cooling sufficiently to reach the dew point temperature. Without adequate cooling, water vapour in the air near the ground does not condense into dew. On clear nights, the Earth's surface radiates heat freely into space, cooling rapidly and allowing dew to form.
geography: Why are dewdrops not formed on a cloudy night?

Related questions

More UPSC Prelims practice from the same subject and topic.