Freezing level

The freezing level or freezing level height (FLH) represents the altitude in which the temperature in a free atmosphere is at 0 °C , i.e. the freezing point of water. FLH is important for weather in mountainous regions and aviation and over time an indicator of climate variability and climate change.

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.

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