👉 In geology, a cumulus is a type of cloud that appears in the sky as a series of tiny, round objects that are often seen as fluffy white clouds. These are often associated with a high-pressure system and are typically formed during the day when there's a lot of sunlight. Cumuli can be classified into two main categories: cumulonimbus clouds and stratus clouds. Cumulonimbus clouds are characterized by their towering, dark masses that can be seen in the sky