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Visibility conditions refer to the state of the atmosphere that affects the distance one can see. This can be influenced by various factors such as weather, light, and obstructions. In aviation and maritime contexts, visibility is a critical safety parameter, as it directly impacts a pilot's or navigator's ability to perceive their surroundings, potential hazards, and navigational aids. Poor visibility can arise from fog, mist, heavy rain, snow, dust storms, or smoke. Conversely, good visibility allows for clear sight over longer distances.

In meteorology, visibility is often measured in kilometers or miles. It is determined by observing how far objects can be seen and identified. Different types of visibility exist, including horizontal visibility, which is the most commonly reported, and vertical visibility, particularly important for aircraft taking off and landing. Factors like the color and contrast of objects against the background also play a role in perceived visibility. Understanding and monitoring visibility conditions are essential for safe transportation and various outdoor activities.