Solo flight through which of the following is prohibited?

Solo flight through precipitation is prohibited primarily due to safety concerns. Precipitation can significantly impair visibility and aircraft performance. When flying through heavy rain, for instance, visibility can drop dramatically, making it difficult for pilots to maintain situational awareness. Additionally, precipitation can lead to the accumulation of water on the aircraft's surfaces, potentially affecting control and stability.

Understanding the hazardous nature of flying solo in such conditions is vital for a pilot's safety, as they may not have the experience required to handle unexpected challenges that precipitation can bring, such as reduced visibility, potential icing conditions in certain temperatures, or turbulence associated with rain showers.

The requirement to avoid solo flights in precipitation underscores the need for a solid foundation in flying within safe weather parameters, especially for pilots who are still developing their skills and decision-making abilities.