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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 of the ionosphere can vary depending on altitude. It can range anywhere from 200 degrees Kelvin to 500 degrees Kelvin.he ionosphere is surprisingly thin compared to the rest of the  atmosphere. It lies about 75 to 1,000 kilometers above the earth.