Which of the following weather phenomena can significantly affect aviation?

Thunderstorms and turbulence are known to significantly affect aviation due to their associated hazards. Thunderstorms can produce severe turbulence, wind shear, lightning, heavy precipitation, and even hail, all of which pose serious risks to aircraft during takeoff, landing, and flight. They can lead to sudden changes in altitude, loss of control, and structural damage to the aircraft. The presence of turbulence, especially when it is severe or unexpected, can also make flying uncomfortable for passengers and challenging for pilots in terms of maintaining aircraft control.

In contrast, clear skies and high visibility generally indicate safe flying conditions, as pilots can easily navigate and see other aircraft. Similarly, stable air and moderate temperatures are often associated with smooth flying conditions and do not contribute to aviation hazards. Therefore, they are not considered significant threats to aviation safety. The option stating "None of the above" does not apply because thunderstorms and turbulence are indisputably significant factors in aviation weather concerns.