It spins on its side as it goes around the sun so that one of its poles is almost always tilted sun ward. It is tilted much more than the Earth. On Uranus winter lasts about 42 Earth years, but summer doesn't bring much relief from the cold. Because Uranus is so far from the sun, it is always hot cocoa season. For all planets in our solar system, the seasons depend on the way the planet tilts toward the sun, how the planet spins on its axis, and the length and path of its orbit around the sun.
Sunlight makes warmth.
Darkness means colder temperatures. As you think about seasons around the solar system, it is easy to conclude that Earth's seasons are just right.