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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 opposite is true for the upper atmosphere, which contains very few gases heavier than hydrogen and helium due to its low temperature. Uranus's atmosphere is the coldest of all the planets, with its temperature reaching as low as 49 K.he opposite is true for the upper atmosphere, which contains very few gases heavier than hydrogen and helium due to its low temperature. Uranus's atmosphere is the coldest of all the planets, with its temperature reaching as low as 49 K.