Afternoon clouds form and block the sunlight. A series of tornadoes occurs over a one-week period. An overnight temperature drop causes frost to form. The average amount of annual precipitation decreases.
I gave my students this multiple choice question: Which of these events is an example of a change in climate?

Only one answer is correct among these 4 choices:
- Afternoon clouds form and block the sunlight.
- A series of tornadoes occurs over a one-week period.
- An overnight temperature drop causes frost to form.
- The average amount of annual precipitation decreases.

Could you tell me which one is correct?

The average amount of annual precipitation decreases.