Cold ocean currents near the coast bring drier, cooler air, resulting in a milder and less humid climate.

Cold ocean currents, such as the California Current along the U.S. West Coast, directly influence the coastal climate by cooling the air above the ocean and reducing moisture. This leads to drier conditions, as colder air holds less water vapor. As a result, coastal regions impacted by these currents tend to experience cooler temperatures and reduced humidity, contributing to a more arid or semi-arid climate. These effects are particularly noticeable in areas like California, where the coastal climate is often characterized by mild, dry summers and foggy mornings.