| Term: | Frost |
| Definition: |
Frost is the condition that exists when the temperature of the air near the earth or earth-bound objects falls to freezing or lower (0 CanadaNCA
The condition which exists when the temperature near the earth's surface and earth-bound objects falls below freezing (0 degrees Celsius or 32 degrees Fahrenheit). NSIDCCryosphere (Abbrev. FRST) - Frost describes the formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans. Frost develops under conditions similar to dew, except the temperatures of the Earth's surface and earthbound objects falls below 32 NOAA-NWS A deposit of ice crystals that forms through a process called sublimation. ECCCanada Deposit of soft white ice crystals or frozen dew drops on objects near the ground; formed when surface temperature falls below freezing point. AustraliaBoM Covering by ice produced by the sublimation of water vapour on objects that are colder than 0 degrees Celsius. WMOHydrology The occurrence of air temperatures below 0˚C IPAPermafrost 1.The fuzzy layer of ice crystals on a cold object, such as a window or bridge, that forms by direct deposition of water vapor to solid ice. 2.The condition that exists when the temperature of the earth's surface and earthbound objects fall below freezing. Depending upon the actual values of ambient-air temperature, dewpoint, and the temperature attained by surface objects, frost may occur in a variety of forms. These include a general freeze, hoarfrost (or white frost), and dry freeze (or black frost). If a frost period is sufficiently severe to end the growing season (or delay its beginning), it is commonly referred to as a killing frost. See frost day, ground frost. AMSglossary Deposition of ice at the Earth's surface because of atmospheric cooling. PhysicalGeography GCW |