"Mt. Everest is downright cold all of the time - at over 29,000 feet, temperatures at the peak are never above freezing, so it never rains there. But it sure gets some snow. We all know that snow melts, but if it never rises above freezing, how does snow not build up forever on Mt. Everest? Winds, often at hurricane force, blow tons of snow off the peak. But a part of the water cycle called "sublimation" is also at work. Just as evaporation turns liquid water into water vapor gas, sublimation turns frozen water directly into water vapor gas, skipping the melting phase into a liquid. Also, as with evaporation, the sun's heat causes sublimation to work, and on top of Mt. Everest on a clear day, the sun is very strong and provides energy for sublimation, even though it is below freezing. Sublimation doesn't just occur on mountain peaks. If there is snow and ice buildup in your neighborhood then on a sunny and dry day sublimation is happing there, too." That is what https://water.usgs.gov/edu/gallery/watercyclekids/sublimation-everest.html says.
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