The climate of Brazil comprises a wide range of weather conditions across a large area and varied topography, but most of the country is tropical. The different climatic conditions produce environments ranging from equatorial rainforests in the north and semiarid deserts in the northeast, to temperate coniferous forests in the south and tropical savannas in central Brazil. Temperatures average 25 °C (77 °F), with more significant temperature variation between night and day than between seasons.