The Amazonian city of Manaus, Brazil, located at latitude 3∘S3^\circ\text{S}3∘S, experiences an average monthly temperature that fluctuates only between 25.9∘C25.9^\circ\text{C}25.9∘C and 27.2∘C27.2^\circ\text{C}27.2∘C throughout the year, resulting in an annual temperature range of just 1.3∘C1.3^\circ\text{C}1.3∘C.
Explain why tropical rainforest regions, such as the Amazon Basin, experience such a small annual temperature range.
