How Frost Forms

Frost forms when water vapor is frozen onto a surface. Moisture in the air comes into contact with a surface that is at or below freezing and the thin icy layer is formed. A light wind will help temperatures fall quickly and contribute to the formation of frost.

Frost can be dangerous to delicate plants but does not result in the same dangerous slickness that you get with ice or snow.

More Weather Glossary

  • Hoar Frost

    After a cold, clear winter night without much wind, the ground and nearby tree branches may be covered by tiny, white ice crystals.

Daily U.S. Extremes

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WeatherWhys®

This Day In Weather History

New York City, NY (1888)
Heat wave: a record 14 consecutive days with 80-degree plus average ended.

Milford, UT (1970)
105 degrees -- record high for city.

Weatherford, TX (1980)
119 degrees -- highest temperature in Texas during a very hot year.

Rough Weather