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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.
Mars: Marsâ average surface temperature is -55 Â°C, but the Red Planet also experiences some variability, with temperatures ranging as high as 20 Â°C at the equator during midday, to as low as -153 Â°C at the poles.uch like the other gas giants in our Solar System, the core of Uranus gives off far more heat than is absorbed from the Sun. However, with a core temperature of approximately 4,737 Â°C, Uranusâ interior gives of only one-fifth the heat that Jupiterâs does and less than half that of Saturn.