Here's why:

* Average Temperature: Uranus has an average temperature of -214°C (-353°F), making it the coldest planet in the solar system, with the exception of Neptune.

* Neptune: Neptune is even colder than Uranus, with an average temperature of -214°C (-353°F), making it the coldest planet in the solar system.

* Distance from the Sun: Uranus is the seventh planet from the sun, and its extreme distance means it receives very little sunlight. This lack of solar energy is a major factor in its frigid temperatures.

It's worth noting that the temperature of a planet can vary depending on its location and time of year. However, the average temperature of Uranus makes it the third coldest planet in our solar system.