What does the "G" signify in a METAR wind report (e.g., G20KT)?

In a METAR wind report, the "G" signifies gusts, specifically referring to wind gusts that exceed the average sustained wind speed over a specified period. When you see a report such as G20KT, it indicates that there are wind gusts reaching 20 knots, which means that the wind is changing speed rapidly and could significantly affect aircraft performance and safety. It is important for pilots and meteorologists to recognize and interpret wind gusts accurately, as these can lead to turbulence and sudden changes in aircraft control.

The other options do not accurately represent the meaning of "G" in this context, as "Ground" and "General" are not terms typically associated with wind reports in METARs, and "Gale" refers to a specific wind speed classification rather than gusts.