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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.
Facts about Uranus. 1  Uranus was officially discovered by Sir William Herschel in 1781. 2  Uranus turns on its axis once every 17 hours, 14 minutes. 3  Uranus makes one trip around the Sun every 84 Earth years. 4  Uranus is often referred to as an âice giantâ planet. 5  Uranus hits the coldest temperatures of any planet. With minimum atmospheric temperature of -224Â°C Uranus is nearly coldest planet in the solar system. While Neptune doesnât get as cold as Uranus it is on average colder. The upper atmosphere of Uranus is covered by a methane haze which hides the storms that take place in the cloud decks.