What air mass is characterized by high humidity and temperature?

The air mass characterized by high humidity and temperature is the Maritime Tropical (mT). This air mass forms over warm ocean waters, which allows it to absorb moisture and warmth from the sea surface. As a result, the Maritime Tropical air mass is typically associated with warm, humid conditions and is often responsible for bringing warm, moist air to coastal regions and, sometimes, farther inland.

In contrast, the other options do not have the same characteristics of being both humid and warm. For example, the Continental Polar (cP) air mass originates over cold land areas and is generally cold and dry, leading to lower humidity. The Maritime Polar (mP) air mass, while it can be humid, is usually cold and comes from cold ocean regions, making it less warm than the Maritime Tropical. Finally, the Continental Tropical (cT) air mass generally comes from hot, dry land areas, resulting in higher temperatures but low humidity levels. Therefore, it is the Maritime Tropical air mass that best fits the characteristics of high humidity and temperature.