Phase change to meltwater is straightforward. Sublimation to vapor would require a low pressure.
Quote:
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Sublimation is the transition of a substance directly from the solid to the gas state,[1] without passing through the liquid state.[2] Sublimation is an endothermic process that occurs at temperatures and pressures below a substance's triple point in its phase diagram, which corresponds to the lowest pressure at which the substance can exist as a liquid.
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en.wikipedia.org/wiki/Sublimation_(phase_transition)
edit: You are thinking about the clouds?
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