Which air mass is unstable in the winter but stable in the summer?

Name: Which air mass is unstable in the winter but stable in the summer?
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Question

Quizplus · Accepted Answer

Maritime Polar (mP) air masses are unstable in the winter due to the relatively warm ocean water heating the cooler air above, leading to convection and instability. In the summer, the ocean is cooler relative to the warmer air, making the air mass more stable.

Which Air Mass Is Unstable in the Winter but Stable