Low pressure systems circulate counter-clockwise. High pressure systems
circulate clockwise. These "motions" (caused by these circulations) are the
building blocks in our atmosphere. They give us our weather.
A Low’s counter-clockwise circulation forces air upward (ultimately resulting in
condensation, cloud formation and ultimately precipitation). A High’s clockwise
circulation causes a sinking motion in the atmosphere, resulting in fair/clearer
and often sunnier skies.