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| Filed Under: Space Leave a Comment. The ionosphere layer of the atmosphere overlaps the mesosphere and thermosphere and is the uppermost part of the atmosphere. The temperature of the ionosphere ranges from about 200K, or -73 ÂºC (-99.4 ÂºF) to 500K, or 227 ÂºC (440.6 ÂºF).So basically at the bottom it is 200K. At the top it is 500K.K is in Kelvin.he temperature of the ionosphere ranges from about 200K, or -73 ÂºC (-99.4 ÂºF) to 500K, or 227 ÂºC (440.6 ÂºF). So basically at the bottom it is 200K. At the top it is 500K. K is in Kelvin.
The temperature at this surface is approximately minus 346 F (minus 201 C). The planet's average temperature is minus 353 F (minus 214 C). But despite being the most distant planet, it is not the coldest.That honor goes to the seventh planet, Uranus, which is closer to the sun.nlike the terrestrial planets, Neptune and the other gas giants still hold much of the atmosphere they had at their formation. Temperature and pressure shift at different heights. The average temperature at the top of the cloud tops is minus 346 degrees Fahrenheit (minus 210 degrees Celsius).