When must pilots be ensured to have current weather information?

Pilots must have current weather information prior to beginning the approach because this phase of flight involves critical decisions that impact safety and operational effectiveness. The approach phase can bring pilots closer to the ground and potentially into various weather conditions that could affect visibility, ceiling, and wind. Having up-to-date weather data allows pilots to assess the suitability of the approach based on current conditions, make informed decisions about landing options, and ensure safe operations should they need to execute a go-around or divert.

During an approach, pilots rely on current weather information to determine if they can safely continue or if they need to adjust their flight path. This includes understanding phenomena like fog, thunderstorms, or sudden changes in wind direction and speed, which could significantly influence landing safety. Therefore, acquiring current weather data before this critical phase acts as a safeguard for both pilots and passengers, ensuring adherence to safety protocols in variable weather conditions.