Which type of precipitation is specified with the code "RA" in METAR reports?

The code "RA" in METAR reports specifically denotes rain. This is part of the METAR specifications for reporting weather conditions at an airport or aerodrome. In the METAR format, various two-letter codes are used to provide concise information about the weather phenomena occurring at the reporting station.

Rain, represented by "RA," indicates that liquid precipitation is falling from the atmosphere, which is significant for pilots and ground operations as it can affect visibility, runway conditions, and overall flight safety. Understanding this code is essential for interpreting METAR reports accurately, particularly during flight planning and operations.

Other types of precipitation, such as sleet, snow, or hail, have their own distinct codes. Sleet, for example, is coded differently, which helps differentiate the types of weather conditions reported. This precision in weather reporting aids in the safe and efficient operation of aviation activities.