A tropical rainforest climate or equatorial climate is a tropical climate subtype found in the tropics, usually within 10 to 15 degrees latitude of the equator. This climate type is designated Af in the Köppen climate classification. A tropical rainforest climate is typically hot, very humid, and wet with no dry season. The average temperature in tropical rainforests ranges from 20–30 °C (68–86 °F). Temperatures don't change much throughout the year and also don't change much between night and day. The humidity is always very high, ranging between 77% to 100% year-round. Thanks to the tropical rainforest climate, tropical rainforests are lush all year long.