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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.
The upper atmosphere of Uranus is the coldest in the Solar System, with a minimum temperat â¦ ure of 49 Â°K. It has a complex cloud structure with water clouds presumably being the deepest and methane clouds at the top.ranus is the coldest planet of our solar system, with temperatures  as low as minus 224 degrees Celcius.