Which of the following conditions is usually associated with high pressure systems?

High pressure systems are typically associated with clear skies and calm conditions. When a high pressure system is present, the atmospheric pressure is higher than the surrounding areas, which generally leads to downward motion of air. This downward motion inhibits cloud formation because it suppresses the rise of air that is necessary for clouds to develop. As a result, conditions tend to be stable and dry, leading to clear skies.

In addition, the calm conditions are often attributed to the lack of strong winds associated with high pressure systems. These systems create a stable atmosphere, which can prevent the turbulence that often leads to windy conditions. Therefore, clear skies and calm scenarios are hallmark features of high pressure systems, making this choice correct.