What is the METAR code for snow grains?

The correct code for snow grains in METAR is SG. In aviation weather reporting, each type of precipitation or weather phenomenon is designated with specific abbreviations to provide a concise understanding of current conditions. Snow grains are small, white, opaque grains of ice that are often mixed with rain and don't accumulate significantly.

The METAR code system includes various codes for different types of weather; for instance, SN is used for snow, which represents regular snowfall. SHSN stands for snow showers, indicating more intermittent snow events. The code IC is reserved for ice crystals, a different type of precipitation. Understanding these codes is essential for interpreting METAR reports effectively, as they provide critical information for pilots regarding weather conditions at airports.