What type of precipitation is indicated by -SN in a METAR report?

The code -SN in a METAR report signifies light snow. In METAR reports, the format for precipitation types uses a combination of letters and symbols to convey specific weather phenomena; the prefix "-" indicates that the precipitation is light. The letters "SN" stand for snow. Therefore, the presence of both indicates that light snow is currently occurring at the reporting station.

Understanding METAR reports is essential for pilots as they provide crucial real-time weather information essential for flight planning and safety. Knowing the distinction between different forms and intensities of precipitation helps in assessing conditions that could affect visibility, aircraft performance, and overall flight safety.