Answer: High Pressure System
Explanation: In a high pressure system warm air pushes cold air down towards the earths surface. During high pressure the air temperature is low making air molecules compressed and are closer to each other. Due to this, the amount of humidity or water vapor that accumulates in the troposphere is less since there is no enough space for water vapor to occupy. Low humidity means and indicates good weather. So high pressure systems causes sunny and none to minimal amount of clouds in the sky.
