What weather condition does low visibility typically indicate in aviation weather reports?

Low visibility in aviation weather reports typically indicates the presence of obscuring phenomena such as fog, heavy precipitation, or low clouds that restrict the pilot's ability to see clearly. Cloudy weather often contributes to low visibility, particularly when cloud cover is dense or when low-lying clouds are present.

While snowy conditions can also lead to low visibility, cloudy weather is a more general and frequent cause of reduced visibility as it encompasses various forms of overcast skies that may significantly limit sightlines. It is also important to note that while thunderstorms may occasionally contribute to reduced visibility, they are not a direct or consistent indicator as other weather conditions can also lead to low visibility independently of thunderstorm activity. Thus, associating low visibility primarily with cloudy weather aligns with common aviation understanding.