freezing level

The lowest altitude in the atmosphere over a given location, at which the air temperature is 0øC; the height of the 0øC constant-temperature surface.

Related terms:

• freezing-level chart
• isopycnic level
• mandatory level
• constant-level surface
• constant-level chart
• fixed-level chart
• convective condensation level
• melting level
• critical level of escape
• icing level