Thin cirrus clouds
Thin cirrus clouds
Wispy cirrus clouds
Wispy cirrus clouds
Fluffy cumulus clouds
Fluffy cumulus clouds
A big pile of cumulus clouds
A big pile of cumulus clouds
Topic(s):   Clouds, What is ...

A cloud forms in the sky. It is a collection of water or ice that we can see with our eyes.

This is how a cloud is made: The sun heats the air. If the air cools down below the dew point (32F or 0C), the air then fills with water drops. A cloud is formed!

There are four groups of clouds:

1. nimbus

2. stratus

3. cumulus

4. cirrus

Each group of clouds has four families.

1. cirro

2. alto

3. strato

4. fog

Cloud Group: Cirro/High Clouds; Height: 45,000 to 65,000 feet; Cloud families: cirrus, cirrocumulus, cirrostratus

Cloud Group: Alto/Middle Clouds; Height: 23,000 to 45,000 feet; Cloud families: altocumulus, alto stratus, nimbostratus

Cloud Group: Strato/Low Clouds; Height: 6,500 to 8,000 feet; stratus, Cloud families: stratocumulus, cumulus, cumulonimbus

Cloud Group: Fog/Lowest Clouds; Height: Near the ground; Cloud families: fog

Citation information

APA Style: What is a Cloud?. (2013, January). Retrieved from Facts4Me at

MLA Style: "What is a Cloud?." Facts4Me. Jan. 2013.

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