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Fig. 2. Temperatures at the South Col (7891m) of Everest from May 1999 to May 2000. The upper line plots measured air temperatures (data courtesy M. Hawley and the MIT Media Group). The lower line plots estimated wind chill, assuming a wind speed of 50kmh-1 (see text). The period over which successful ascents of Everest occurred in 1999 is shaded.





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