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The atmosphere of Uranus is composed of 83% helium, 15% methane and 2% methane plus trace amounts of other gases such as ethane. The average temperature of the surface of Uranus is 49Â° Kelvin or -224Â° Celsius.What makes the planet so cold is that it has a low internal temperature.ranus is 14.5 times bigger than Earth, making it the third largest planet in the Solar System after Jupiter and Saturn; Uranusâs core alone is as large as our planet.
Temperature on Uranus â A Cold, Cold Planet Although Uranus is not the farthest planet from the Sun, it is the coldest planet in the Solar System. Like its neighbor, Neptune, Uranus is an ice giant, meaning it does not have a solid surface and what is called its âsurfaceâ is actually a layer of clouds that lies above what may be a layer of liquid water and a core of rock at the center of the planet.