Humidity refers to the amount of water vapor in the air, which determines the air's moisture content.

Relative humidity is the ratio of the actual water vapor content of the air to the maximum amount of water vapor the air can hold at a given temperature.

The dew point is the temperature at which the air can no longer hold all the water vapor it contains, causing condensation to occur.

Snow is a form of precipitation that occurs when water vapor in the air condenses directly into ice crystals, forming snowflakes.

Sleet is a type of precipitation that consists of small, round ice pellets formed when raindrops freeze as they fall through a layer of cold air near the Earth's surface.

Hail is a type of precipitation that consists of large, irregular chunks of ice formed when raindrops freeze as they are carried upward by strong updrafts in thunderstorms.

Condensation is the process by which water vapor in the air condenses into liquid water droplets, forming clouds and precipitation.

Dew is a type of precipitation that occurs when water vapor in the air condenses on solid surfaces near the Earth's surface, such as grass and leaves, when the temperature drops below the dew point.

Sublimation is the process by which water vapor in the air changes directly into ice crystals without passing through the liquid phase, often occurring in cold, dry environments.

Frost is a type of precipitation that occurs when water vapor in the air condenses on solid surfaces above the Earth's surface, such as windows and car windshields, when the temperature drops below the freezing point.

Deposition is the process by which water vapor in the air changes directly from ice crystals into water vapor without passing through the liquid phase, often occurring in cold, dry environments.

Freezing rain is a type of precipitation that consists of a mixture of rain and snow, occurring when rain falls through a layer of cold air near the Earth's surface and freezes on contact with cold surfaces.

Condensation is the process by which water vapor in the air is converted into liquid water droplets, forming clouds and precipitation.

Sleet is a type of precipitation that consists of small, frozen water droplets formed when raindrops freeze as they fall through a layer of cold air near the Earth's surface.

Sublimation is the process by which water vapor in the air is converted directly into ice crystals, often occurring in cold, dry environments.