Which of the following would be most useful if you want to understand the climate of Oklahoma?

A: The average weather of the state for the past twenty-four hours
B: The average weather of the state for the past five days
C: The average weather of the state for the past five years
D: The average weather of the state for the past twenty-five years.

D: The average weather of the state for the past twenty-five years. This would provide a more comprehensive and long-term perspective on the climate patterns in Oklahoma.