What does the abbreviation "FZ" represent in the context of a METAR?

In the context of METAR reports, "FZ" stands for "Freezing." It primarily refers to conditions when the air temperature is at or below 0 degrees Celsius (32 degrees Fahrenheit). This abbreviation is crucial for identifying significant meteorological phenomena that could impact aviation and ground operations.

The notation is specifically used in reference to various phenomena, including freezing conditions that can lead to the formation of frost or ice on surfaces, which is important for pilots and ground crews to be aware of. The distinction of "FZ" ensures that those interpreting METAR reports can quickly identify potential hazards associated with freezing temperatures.

Understanding this abbreviation helps users of METAR reports take necessary precautions and adjustments when encountering freezing temperatures, leading to better safety and operational decisions.