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frost point

noun
1.
the temperature of the air at which hoarfrost begins to form.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for frost point
  • Frost crystals form when water vapor freezes upon contact with a surface that is below the frost point.
  • Temperatures below the frost point are occasionally seen in the winter polar stratosphere.
  • Frost typically forms if the temperature on a given surface cools to the frost point.

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