Which phenomenon is often associated with high-pressure systems in winter?

High-pressure systems in winter are commonly associated with clear skies. This occurs because high-pressure systems lead to descending air, which inhibits the formation of clouds. As the air sinks, it warms up and limits humidity, creating stable atmospheric conditions. This stability often results in sunny days and reduced precipitation, making clear skies prevalent.

In winter, this effect is particularly notable, as high-pressure systems can lead to cold temperatures but clear conditions, allowing for more sunlight during the day compared to lower-pressure situations, which tend to be cloudier and might bring precipitation.