Final answer:
An antonym for a tranquil climate could be an unstable climate, characterized by unpredictable and volatile weather patterns.
Step-by-step explanation:
An antonym for a generally 'tranquil' climate could be an 'unstable' climate. In a tranquil climate, the weather conditions are calm, peaceful, and quiet. On the other hand, an unstable climate would be characterized by unpredictable and volatile weather patterns, with frequent storms, strong winds, and extreme temperatures.