Wladimir Köppen

Hello! My name is Wladimir Köppen, and I spent my life trying to understand the Earth’s weather. I was born on September 25th, 1846, in a big city called Saint Petersburg in the Russian Empire. My family was German, so growing up, I learned to speak both Russian and German. As a boy, I was fascinated by the world around me. I loved looking at plants and trees, and I was always writing down what I saw in my notebooks. I wondered why some plants grew in my backyard, but others only grew in faraway places I read about in books. This curiosity led me to study science at universities in Russia and Germany. I wanted to find answers to my questions about the natural world.

After I earned my doctorate degree in 1870, my interest shifted from just plants to the air and the sky above them. I became a meteorologist, which is a scientist who studies the weather. In 1875, I took a very important job in Hamburg, Germany, at the German Naval Observatory. My work was to study weather patterns over the ocean to help keep sailors safe. I spent my days looking at weather balloons, studying maps, and trying to predict storms. But I was still thinking about my childhood questions. I realized that the weather in a place over a very long time—what we call its climate—was the main reason certain plants grew there. I decided to find a way to organize all the different climates on Earth.

I had a big idea: what if I could create a map that showed all the world's climates? I believed the best way to define a climate was by looking at the plants that lived there. For example, if a place had palm trees and lush vines, it must be hot and rainy. If it had only tiny mosses and no trees, it must be very cold. I used two main ingredients for my climate recipe: temperature and precipitation (how much rain or snow falls). I divided the world into five main groups, which I gave letter codes like 'A' for tropical climates and 'E' for polar climates. In 1884, I published my first climate map. It wasn't perfect, so I kept working on it for many years, making it more and more detailed. I even worked with my son-in-law, Alfred Wegener, who was another famous scientist. We studied the climates of the past together.

I continued to study our planet's climates for the rest of my life. I lived to be 93 years old, always curious and always learning. Today, the system I created is called the Köppen climate classification, and it is still one of the most widely used systems in the world. When you see a world map with colorful zones showing deserts, rainforests, and tundras, you are likely looking at my work. My map helps us understand our amazing planet and why life is so different from one place to another. I hope my story encourages you to look closely at the world, ask big questions, and never stop exploring.