Why some air masses are cool, cold, warm, and hot as well as moist or dry?

Explanation:

Often times, the property of air masses is a function of where they originate from especially with respect to latitude.

An air mass is certain amount of air with some unique set of temperature and vapor component.

Air masses differs from places to places based on where  they originate. Continental air masses are usually dry and cold because there is little to no water on a land mass. Air masses that originates from the surface of the ocean are predominantly moist. In polar regions, the air mass is cold. Around the tropics, they are usually warm due to insolation here.

Definitely the indoraptor