Final answer:
Uranus, with an axial tilt of 97.9°, has the most extreme seasons of the giant planets, causing prolonged periods of sunlight and darkness in each hemisphere.
Step-by-step explanation:
Among the giant planets in our solar system, Uranus should have the most extreme seasons due to its significant axial tilt of 97.9°.
The extreme tilt causes one hemisphere to be bathed in sunlight for about 21 years while the other is in darkness, followed by another 21-year period where this situation is reversed when Uranus has completed half its orbit.
Despite the contrasting periods of sunlight and darkness, the overall atmospheric temperature variation on Uranus is surprisingly minimal, suggesting a complex atmospheric behavior that is not yet fully understood.