The atmospheric layer where weather occurs is called the "troposphere." This is the lowest part of Earth's atmosphere, extending from the surface up to about 8 to 15 kilometers (5 to 9 miles) high, depending on latitude and season. In the troposphere, temperature decreases with altitude, leading to the formation of clouds, precipitation, and various weather phenomena. It contains the majority of the atmosphere's mass and is crucial for supporting life on Earth. Meteorological phenomena and climate patterns are largely dictated by processes occurring within this layer.