FAA Aircraft Dispatcher Complete Practice Exam

METARs, or Meteorological Aerodrome Reports, are crucial for aviation as they provide real-time weather information for airports and aerodromes. They are issued regularly, every hour, and can be updated more frequently if there are significant changes in the weather conditions. This ensures that pilots and aviation personnel have the most current data to make informed decisions regarding flight operations.

The frequency of issuance aids in maintaining safety and helps in planning, as weather conditions can change rapidly. Therefore, it's essential for the METARs to reflect these changes promptly, making the specified interval of issuing every hour or during significant weather changes the correct assertion about their issuance frequency.