What would the temperature at the peak be if Mount Everest was located where Mount Logan is now?

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According to summitsofcanada, on May 26 1991 Mount Logan recorded a temperature of -77.5 °C, making it the coldest recorded temperature outside Antarctica.

 

But what would the temperature be at the peak if Mount Everest (which is 2889 meters higher than Mount Logan) was located where Mount Logan is?

Edited November 16, 2010 by Uri