What is the primary purpose of ASOS?

The primary purpose of ASOS (Automated Surface Observing System) is to monitor weather conditions specifically for aviation use. This system is designed to provide accurate and timely weather information, including data on temperature, dew point, wind speed and direction, visibility, cloud cover, and significant weather events such as precipitation. By collecting and disseminating this information, ASOS plays a critical role in ensuring safe flight operations, as pilots and air traffic controllers rely on precise weather data to make informed decisions regarding takeoffs, landings, and in-flight navigation.

The other options pertain to functions that are not the core responsibilities of ASOS. Controlling airport traffic involves air traffic control systems, while regulating communication systems and managing lighting systems relates to different airport operations and infrastructure that are not within the scope of ASOS's primary function.