D
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Which of the following data would be most useful for describing the climate of a specific area?

### Choices:
A. average weekly wind speeds for 1 month
B. daily relative humidity levels for 18 months
C. total annual precipitation amounts for 2 years
D. average high and low monthly temperatures for 20 years

### Answer:
