The name of the layer of the atmosphere where weather occurs is the troposphere. This is the lowest layer of the Earth's atmosphere, extending from the surface up to about 8 to 15 kilometers in altitude, depending on location and weather conditions. The troposphere contains most of the atmosphere's mass, including water vapor, which is crucial for weather phenomena such as precipitation and storms. Temperature decreases with altitude in this layer, which is also characterized by mixing and turbulence. Above the troposphere lies the stratosphere, where the temperature inversely increases with altitude.