What is the common aviation abbreviation for rain?

The common aviation abbreviation for rain is "RA." In meteorological terms used within aviation, "RA" is widely recognized and utilized in reports and forecasts to indicate the presence of rain. This abbreviation is essential for pilots and air traffic control to understand weather conditions quickly and effectively, which helps in making informed decisions regarding flight operations.

This terminology aligns with standard weather reporting practices where consistent abbreviations are critical for clarity and safety in communication. Familiarity with such abbreviations is vital for anyone involved in aviation, as it directly impacts flight planning and operational safety.