The Tropical Climate: Af, Am, Aw
Tropical climates hug the equator, stretching roughly 15° to 25° north and south of it. Defined by consistently high temperatures—every month averages above 18°C—these regions experience no true winter. The Köppen classification splits them into three subtypes: Af (tropical rainforest), Am (tropical monsoon), and Aw (tropical savanna). Rainfall, not temperature, drives the seasonal rhythm. Near the equator, Af zones receive steady, heavy rain year-round, while Am and Aw areas have distinct wet and dry seasons tied to shifting wind patterns.
Seasonally, the tropics feel like one long summer, but the character changes dramatically with the rains. In Af climates, daily downpours keep the air muggy and lush. Am zones have a short dry spell, often followed by torrential monsoon rains. Aw savanna climates see a longer dry season, when grasses brown and dusty winds sweep through. Temperatures hover between 25°C and 30°C most days, with slight variation from coastal or altitude influences. Humidity is high everywhere, making the heat feel oppressive—except in rare mountain refuges.
Top cities in this climate
About Tropical climate
The tropical climate group, designated by the Köppen code A, includes three subtypes: Af (rainforest), Am (monsoon), and Aw (savanna). All share the criterion of every month’s average temperature ≥18°C, with no frost or winter. The subgrouping hinges on precipitation: Af requires the driest month to receive at least 60 mm of rain; Am has a dry season but annual rainfall is high enough to compensate (minimum 1000 mm, with a short dry month); Aw’s dry season is more pronounced—the driest month gets less than 60 mm and often under 100 mm, with rainfall heavily concentrated in summer.
Seasonal patterns vary sharply. Af climates, like those in Singapore or the Amazon basin, have no true dry season—rain falls nearly every afternoon, with monthly totals often exceeding 200 mm. Temperatures are uniformly warm, typically 25–28°C. Am climates, found in Mumbai or parts of Southeast Asia, experience a dramatic monsoon: a dry winter with monthly rain below 60 mm (e.g., January in Mumbai sees just 1 mm), followed by a deluge from June to September (over 600 mm monthly). Aw climates, such as Havana or Nairobi, face a longer dry season spanning 3–5 months; for example, Havana sees November–April as dry (around 40–80 mm per month), then a wet summer from May to October (over 100 mm monthly), with temperatures around 24–28°C.
For travel, packing light, breathable fabrics is essential. A rain jacket or umbrella is mandatory year-round in Af, while Am and Aw visitors should adjust for wet and dry seasons. The best time to visit Af zones is anytime, but expect daily showers. Am destinations are ideal just after the monsoon (October–February) when the air is clean and rains have eased. Aw savanna spots are best in the dry season (winter in each hemisphere) to avoid mud and mosquitoes. Altitude can modify the feel—highland tropical cities like Medellín offer cooler temperatures (22°C average) despite being near the equator.
Notable cities showcase the range. Singapore (Af): constant humidity, rain literally every day, with temperatures stuck at 27°C year-round. Mumbai (Am): a punishing monsoon from June–September (2,500 mm annually) but a dry winter of 20–30°C pleasantness. Havana (Aw): a classic tropical savanna rhythm—warm winters (22°C) with little rain, hot humid summers (28°C) with frequent thunderstorms. Each demands different preparation, but the core truth remains: the tropics are warm, wet, and wonderfully diverse.
Najczęściej zadawane pytania
What does the Köppen code Af mean?
Af stands for tropical rainforest climate. It means the driest month receives at least 60 mm of rain and every month averages above 18°C. These areas, like the Amazon or Singapore, are lush and wet year-round.
What is the difference between tropical and subtropical climates?
Tropical climates (group A) have every month above 18°C, with no winter. Subtropical climates (like Cfa or Cwa) have a cool or mild season where the coldest month falls between 0°C and 18°C. Subtropics experience frost occasionally, while tropics never do.
Is the tropical climate always hot and humid?
Almost always hot, yes, but humidity varies. Af climates are humid year-round; Am and Aw have a drier season when humidity drops. Coastal breezes or high altitude can make the heat more bearable—cities like Quito (tropical highland) are cool despite being equatorial.
Do tropical climates have seasons?
They have two seasons: wet and dry, not the four-season cycle. In Af, the wet season is constant. In Am, a short dry season precedes monsoon. In Aw, a distinct dry season (winter in that hemisphere) lasts several months. Temperatures remain high throughout.
Which tropical climate gets the most rain?
Af (tropical rainforest) typically receives the highest rainfall, often 2,000–4,000 mm per year. Am (monsoon) can be very wet (over 2,500 mm) but concentrates rain. Aw (savanna) is the driest, with 900–1,500 mm annually.
What is the best time to visit a tropical destination?
It depends on the subtype. For Af, any time works, but pack for rain. For Am, visit during the dry season (winter) to avoid torrential rains. For Aw, choose the dry season—typically winter in each hemisphere—to enjoy sunny days without muddy conditions.