Which type of air mass is usually drier and stable, often leading to clear weather?

The correct answer is the dry air mass. This type of air mass is characterized by low humidity and a stable atmosphere, which typically results in clear skies and dry conditions. Dry air masses form over land, particularly in regions where there is less moisture available, such as deserts or areas experiencing high pressure.

The stability of a dry air mass means that there is little vertical movement, reducing the likelihood of cloud formation and precipitation. As a result, it often leads to extended periods of clear weather. In contrast, moist air masses contain higher levels of humidity, which can lead to cloud development and precipitation, while warm and cold air masses may vary in stability but do not inherently lead to clear weather like a dry air mass does.