Köppen Climate & Biome Explorer

Climate is what makes a place look the way it looks: the same rock and rainfall that build a rainforest elsewhere build a desert here. This simulation runs a simplified version of the real Köppen–Geiger climate classification — the system geographers actually use to divide the world into climate zones — on four numbers you control: mean annual temperature, total precipitation, how much temperature swings across the year, and how unevenly rain falls across the seasons. The algorithm walks through the same aridity threshold, temperature bands, and dry-season tests used on real weather-station data, prints out a genuine Köppen code such as Af, BWh, Cfb or Dfc, and then grows a matching 3D landscape in front of you — rainforest canopy, desert dunes and scrub, steppe grassland, taiga conifers, or bare tundra and ice — so you can see how geography and climate are two sides of the same set of equations.