What effect does high humidity have on visibility during flight?

High humidity reduces visibility during flight primarily due to the presence of moisture in the air. When humidity levels are high, the air becomes saturated with water vapor, which can lead to the formation of fog, haze, or clouds. These conditions scatter light and obscure objects in the distance, making it difficult for pilots to see other aircraft, landmarks, or the ground.

Additionally, high humidity can exacerbate the effects of other visibility-reducing phenomena, such as rain or mist. In these situations, the combination of humidity and precipitation can severely limit sight distance and overall visual clarity. Understanding how humidity interacts with atmospheric conditions is essential for safe flight operations, as it directly affects a pilot's ability to navigate and maintain situational awareness.