* They are often cumulus clouds: These are the fluffy, white, cotton-ball shaped clouds we associate with summer. They form due to rising warm, moist air.

* They can produce thunderstorms: Cumulus clouds can grow into towering cumulonimbus clouds, which are the clouds that bring thunderstorms, lightning, and heavy rain.

* They can be high-altitude cirrus clouds: Cirrus clouds are wispy, feathery clouds made of ice crystals. They can be present even in the summer sky, but usually don't produce rain.

* They can vary in color: While often white, summer clouds can appear gray or even dark depending on their thickness and how much sunlight is passing through them.

* They help cool the Earth: Clouds reflect sunlight back into space, helping to keep the Earth cooler.

* They can be associated with strong winds: Summer thunderstorms often produce gusty winds, which can be dangerous.

Remember: While summer skies are often filled with clouds, the specific types and characteristics can vary greatly depending on location and weather conditions.