What does the term "FG" in METAR reports mean?

The term "FG" in METAR reports stands for "Fog." This designation indicates the presence of fog at the reporting station, which is defined as a weather condition where visibility is reduced due to suspended water droplets in the air. When "FG" appears in a METAR report, it signifies that visibility is likely less than 1 statute mile, a crucial piece of information for pilots and meteorologists as it affects flight safety and navigation.

Understanding this term is important for interpreting weather conditions effectively, especially in aviation contexts where fog can significantly impact takeoffs and landings. The presence of fog suggests a need for caution, as it can lead to low visibility conditions. While other choices may seem plausible, they do not accurately reflect what "FG" represents in weather reporting.