What effect do high pressure systems generally have on weather?

High-pressure systems are typically associated with stable atmospheric conditions. When a high pressure system is present, it means that air is descending, which suppresses the formation of clouds. As a result, this often leads to clear skies and calm weather, contributing to sunny and dry conditions. This dissipation of cloudiness is a direct consequence of the descending air, which discourages the development of clouds and precipitation.

In contrast, increased cloudiness and worsening weather are often linked to low-pressure systems, which encourage upward motion and can lead to cloud formation and storms. Similarly, possible thunderstorms are also most commonly attributed to low-pressure areas where moisture and instability can lead to significant weather changes. Thus, the primary effect of high-pressure systems is to promote clear, pleasant weather, making the chosen answer the most accurate reflection of their impact.