Which type of air mass is known for its humid characteristics?

Maritime air masses are known for their humid characteristics because they form over large bodies of water, such as oceans or seas. As these air masses gather moisture from the water surface, the resulting air becomes saturated with water vapor, leading to high humidity levels. This moisture-laden air often contributes to precipitation when it moves over land and is uplifted, which is especially common in coastal regions.

In contrast, continental air masses develop over land and are typically dry, while tropical air masses can vary in moisture content but often have heat rather than humidity as their defining characteristic. Arctic air masses are characterized by cold temperatures and low humidity, further distinguishing them from maritime air masses.