# Travel >> Types of Travel >> Spring Break

Do Tropical Rainforests Have a Dry Month? Precipitation Patterns Explained

Tropical Rainforests: No True Dry Month

By definition, tropical rainforests (Af climate in Köppen) receive ≥60 mm (2.4 in) of rain every month. There is no dry month—precipitation is consistently high year-round.

What Defines a Tropical Rainforest Climate?

Mean monthly temperature: ≥18°C (64°F) all months.
Annual rainfall: 1,750–3,000+ mm (70–120+ in).
Driest month: Still ≥60 mm.
Seasonality: Driven by ITCZ (Intertropical Convergence Zone) migration—two rainfall peaks (equinoxes), not a dry season.

Contrast: Tropical Monsoon (Am) & Savanna (Aw)

Climate	Dry Month?	Driest Month Rainfall	Example Regions
Rainforest (Af)	No	≥60 mm	Amazon, Congo, Borneo, New Guinea
Monsoon (Am)	Yes (1–3 months)	<60 mm but >100 - (MAP/25)	India, SE Asia, N Australia
Savanna (Aw)	Yes (5+ months)	<60 mm	Sahel, Llanos, Cerrado, N Australia

Micro-Variability

Even in Af zones, relative dryness occurs (e.g., 100 mm vs 300 mm), but never true aridity. Epiphytes, amphibians, and soil microbes depend on this constancy.