Air rising sharply creates tall clouds, such as thunderclouds, which give brief, heavy showers. Air rising gently, as at a warm front, gives longer, steadier rain. Warmth Depends largely on the amount of sunshine and the cloud cover. Clear, anticyclonic weather gives the hottest days and the coldest nights because there are no clouds to keep the Sun's rays out or hold in any warmth at night. Why the sky is blue Every colour in the sky comes from the Sun.
Sunlight is white, which means it is a mixture of all the colours in the rainbow.
Clear skies are blue because the tiny molecules of gas in the atmosphere scatter mostly blue light towards our eyes, leaving the rest unaffected. The sky gets paler when extra dust or moisture reflect other colours. Sunsets and sunrises tend to be red because the Sun is shining through the thick, lower layers of the atmosphere. The dust and moisture in the air tend to absorb all colours of light but red, which is why the Sun looks red. The dustier or damper the sky, the redder it is.