Which of the highest peaks of the world has never been climbed during winter?

Name of the Karako­ram Range. The name K2 is derived from the notation used by the Great Trigono­met­ric Survey. Thomas Mont­gomerie numbered the most prom­i­nent peaks of Kararko­ram K1 to K35. Next, these were replaced by local names, but K2 appeared not to have acquired a local name, possibly due to its re­mote­ness.

68°C (154.4°F). The boiling point of water depends on the pres­sure. On top of Mount Everest, the pressure is about 260 mbar (26.39 kPa) and the boiling point of water is 69 °C. (156.2 °F). In con­trast, water can still remain liquid near deep hy­dro­ther­mal vents, even if the tem­per­a­ture is very high.

Russia. Two char­ac­ter­is­tic peaks of Mt Elbrus have two volcano craters. The eastern peak has an enormous crater 250m in di­am­e­ter.

Aconcagua is the highest mountain outside Asia, at 6,960.8 metres, and by ex­ten­sion the highest point in both the Western Hemi­sphere and the Southern Hemi­sphere.