What are the main characteristics of stable air?

Stable air is characterized by a lack of vertical motion, which leads to more uniform weather conditions. The presence of steady precipitation indicates that the air is not rising significantly, as would be the case in unstable conditions where convective activity is common. Stratus-type clouds, which form in stable air conditions, typically result in overcast skies and can bring prolonged light rain or drizzle, consistent with steady precipitation.

High visibility is usually associated with unstable air, which promotes clearer skies and varying cloud types, including cumulus clouds. Rapid temperature changes and diverse cloud types suggest a more turbulent and unstable atmosphere where air is moving vertically, contrary to the characteristics of stable air. Warm temperatures without precipitation may exist in certain conditions but do not encompass the defining elements of stable air. Thus, the option indicating poor visibility, steady precipitation, and stratus clouds accurately reflects the nature of stable air.