Amazon River Climate: Tropical Heat and Heavy Rainfall Year-Round

Climate Classification

The Amazon Basin experiences a tropical rainforest climate (Köppen Af)—consistently warm with abundant precipitation year-round.

Key Climate Parameters

• Temperature - Average 25-28°C (77-82°F) with minimal seasonal variation
• Annual Rainfall - 2,000-4,000 mm (79-157 inches)
• Wet Season - December through May, peak rainfall
• Dry Season - June through November, reduced but still significant rain
• Humidity - Consistently high, typically 77-88%

Ecological Significance

This climate supports the world's largest rainforest—5.5 million km² hosting ~10% of known species. The forest generates its own rainfall through evapotranspiration, creating a self-sustaining hydrological cycle that influences regional and global climate patterns.

Threats

Deforestation, climate change, and human activities threaten this system. Protecting the Amazon is critical for biodiversity, carbon sequestration, rainfall regulation, and indigenous livelihoods.