The top of mount everest is at about 8,850 m. what would the approximate air temperature be at that altitude?

If we speak mathematically how the temperature decreases with the altitude than the temperature at Mount Everest should be -86.73 C degrees given that the temperature at zero altitude is 0 C degrees. This is a result of the estimated temperature decrease which comes to 9.8 C degrees drop on every 1,000 meters or 0.98 per every 100 meters eliviation. So 8,850 of altitude by 0.98 C degrees decrease on every 100 meters comes to -86.73 degrees, still keep in mind that this is only if the temperature at 0 altitude is 0 C degrees and that it is only a mathematical estimate under certain conditions, in practice it is much different.

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