Due to its high elevation and low latitude, the climate of the plateau is subject to intense solar radiation and cool temperatures with a large daily fluctuation and little yearly variation. The climate is divided into dry and wet seasons. Overall, the description of the climate is complicated on the Plateau as the temperature varies from place to place. The height of the Plateau accounts for approximately one-third of the troposphere on earth due to its high elevation, since as height rises, troposphere drops. For every 100 m (330 ft) rise, in general there is a 0.6 °C (1.1 °F) fall in temperature. In north Tibet the atmospheric temperatures are in closed temperature isolines showing the distinct impact of high elevation on temperature.