When tiny droplets of moisture condense (join together) in cold air, they form clouds.
You can often work out what the weather will do next by studying the: height, shape and colour of the clouds.
Clouds make places become cooler during the day because they block some of the Sun's rays. At night they trap in heat and keep the air warm. Blocking out or trapping heat is called insulation.
Fog and mist are clouds close to the ground, that often stay still and reduce visibility.
Weather in the UK >