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0-degrees Kelvin corresponds to -273-degrees Celsius. The surface of Pluto, in comparison, can range from a low temperature of 33 Kelvin (-240 degrees Celsius or -400 degrees Fahrenheit) and 55 Kelvin (-218 degrees Celsius or -360 degrees Fahrenheit). The average surface temperature on Pluto is 44 Kelvin (-229 Celsius or -380 Fahrenheit). Back in the days when Pluto was still a planet, it was the coldest planet in the Solar System. But now itâs just a regular temperature dwarf plant â poor Pluto. Neptune is now the coldest planet.
As you get farther away from the Sun, though, temperatures drop as the planets receive less and less of the Sun's warming rays. Using your powers of deduction, you might already have a guess as to which planet in our Solar System is the coldest. If you're an old-school fan of the planets, you probably think Pluto is the coldest planet because it's the furthest from the Sun. And, with temperatures sometimes dipping to -387Âº F, you would be right, except that Pluto is now classified as a dwarf planet and no longer considered a real planet.