What is the main function of a METAR report?

The primary function of a METAR report is to supply current weather conditions at an airport. METAR stands for Meteorological Aerodrome Report, and it is a standardized format for reporting observed weather conditions that are critical for aviation safety. These reports include information such as temperature, dew point, wind speed and direction, visibility, and the presence of weather phenomena such as rain or snow. They are typically issued at regular intervals, often every hour, providing real-time weather information that pilots need for flight operations and planning.

In contrast, forecasting future weather or providing historical weather data is not the purpose of a METAR report. METARs are focused on the present conditions, ensuring that all stakeholders in aviation have the most accurate and timely information about weather at the airport. The reporting of aircraft positions is also unrelated to METARs, as these reports are strictly about weather rather than flight traffic.