What does a clear sky typically indicate in terms of weather conditions?

A clear sky typically indicates the presence of high-pressure systems in the atmosphere. High-pressure areas generally lead to stable air conditions, resulting in fewer clouds and consequently clearer skies. This stability prevents the formation of precipitation, which is usually associated with low-pressure systems where air is rising, cooling, and condensing into clouds. Hence, when skies are clear, it's a good sign of a dominating high-pressure system, promoting dry and settled weather.

Additionally, while clear skies may also relate to low humidity and potentially good visibility, the defining characteristic linked primarily to clear skies is their association with high pressure. Therefore, the correct identification of high-pressure systems as the cause of clear skies highlights the basic principles of meteorology and atmospheric behavior.