Which type of climate is characterized by the smallest annual temperature range near the equator?

Equatorial rainforest climate has some of the smallest annual temperature ranges on Earth. Near the equator, the Sun’s angle changes little across the year, so temperatures remain relatively stable from season to season. Many equatorial places stay warm and humid throughout the year, with only modest variation between months. This is why cities such as Singapore or parts of the Amazon basin show far less seasonal temperature swing than mid-latitude regions.