The average daytime and the average night-time temperature of Uranus is -193 degrees Celsius. There is no change in the temperature from day to night for the seventh planet in the solar system.
Uranus is the coldest planet in this solar system, even though it is not the furthest planet from the sun. The planet is a gaseous planet, made up of mostly hydrogen, helium and methane. The blue-green appearance of the planet is due to the methane in its atmosphere. The planet's internal temperatures may reach 8,540 degrees Fahrenheit. The length of a year is equivalent to 84.01 Earth years.