Humidity is the amount of water in the air and is affected by local temperatures. Different air temperatures can hold different amounts of humidity. This ratio of the amount of water vapor in the air to the greatest amount possible at the same temperature is called relative humidity. Hotter air can hold more humidity than dry air. When the air can still hold more humidity, the water in lakes and puddles and the sweat on people will evaporate to create humidity. When the air is already too humid, water cannot evaporate to create more humidity.
Clouds are made up of drops of liquid in the air: humidity. When the drops of water in the air are not heavy enough to fall back to the ground, they can form into groups and appear as clouds in the sky. When air is too cold and humid to rise, then clouds can form near the earth in the form of fog. Clouds can blow to dry regions and cause rain, changing that region's weather.
Rain is created when the amount of humidity in the air becomes too much for the air to hold. When clouds, which humidity creates, become too heavy, they fall from the sky in droplets. In warm regions, rain falls from clouds; in cold locations the water in the clouds freezes and falls in the form of snow or ice. Clouds can carry water from one region to another in the form of rain, affecting the weather.
High amounts of humidity create clouds, rain and snow. While precipitation is useful, too much precipitation or precipitation in an unprepared area can cause emergency situations for people and animals. Dry regions not used to large amounts of rain may flood when hit with torrential rain. Oversaturated mud creates mudslides and can cause mountainsides to slide down, destroying everything in the way. Large amounts of snow create blizzards, icy roads and avalanches.