What is the defining feature of a 'cold cloud'?

A 'cold cloud' is characterized by having tops at subzero temperatures. This distinguishing feature is essential because the temperature within the cloud impacts the type of precipitation it can produce and the physical processes occurring within it.

In cold clouds, the presence of ice crystals is often a significant factor. These ice crystals can lead to the development of various precipitation forms, such as snow or ice pellets, depending on the surrounding atmospheric conditions as they fall through the air.

While clouds with rain showers and clouds that produce thunderstorms can exist at varying temperatures and are not limited to cold conditions, a cold cloud specifically indicates those with tops that are below freezing. Additionally, a cloud that is completely clear lacks moisture entirely and does not fit within the definition of a cloud, which is inherently a collection of water droplets or ice crystals suspended in the atmosphere.