freezing-level
Definition: The freezing level, or 0 °C (zero-degree) isotherm, represents the altitude in which the temperature is at 0 °C (the freezing point of water) in a free atmosphere (i.e. allowing reflection of the sun by snow, icing conditions, etc.). Any given measure is valid for only a short period of time, often less than a day as variations in wind, sunlight, air masses and other factors may change the level. The 700 hPa pressure level (or about 3000 m above sea level) is generally assumed as a rough estimate of the freezing level.
Source: Wikipedia
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