Why does snow crunch or squeak when you walk on it? Snow crunches in the cold because tiny ice crystals, which are rigid and not well-lubricated by water at low temperatures below ~14°F break and scrape against each other under pressure, creating a shattering or squeaking sound, unlike warmer snow where a thin water layer allows crystals to slide silently. The colder it gets, the harder the crystals are, the thinner the lubricating water, and the louder and more distinct the crunch. | Jeff Oechs

Do you ever notice that the sound of snow can go from a "crunch" to a "squeak" as it gets colder outside? ❄ | The Weather Network

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