Weather and Climate Zones

Is it weather or climate?

When you wake up and look out of the window, you might see sunshine, rain, clouds or snow. That is the weather — what the sky and air are doing today, in your town, right now. Weather can change very quickly. It might be sunny in the morning and rainy by lunchtime!

Climate is different. Climate is the usual weather a place has, measured over many, many years. For example, a desert has a hot, dry climate because year after year it is mostly hot and dry — even if it rains on one unusual day. A good way to remember it:

Weather is what you choose to wear today. Climate is the kind of clothes you keep in your wardrobe all year.

Both are about the same things — temperature, rain, wind and sunshine — but weather is about now and climate is about normally.

Earth's climate zones

Our planet is not the same temperature everywhere. Scientists divide Earth into three main climate zones, like big stripes wrapped around the world.

1. Polar zones ❄️

At the very top and bottom of Earth are the polar zones — the Arctic in the north and Antarctica in the south. These are the coldest places on the planet, covered in ice and snow almost all the time. The Sun is weak here and winters are long and dark.

Only special animals can live here, like polar bears, penguins and seals. They have thick fur, feathers or fat to keep warm.

2. Temperate zones 🍂

Between the poles and the middle of Earth are the temperate zones. This is where many people live, including most of Europe and North America. Temperate climates are not too hot and not too cold. Best of all, they have four clear seasons — warm summers, cold winters, and spring and autumn in between.

You can read all about these in The Four Seasons. Animals like deer, foxes and rabbits live happily in temperate lands.

3. Tropical zones ☀️

Around the middle of Earth, near an imaginary line called the Equator, are the tropical zones. These are warm or hot all year round. Many tropical places are also very wet, with heavy rain that helps thick green rainforests grow. It is warm and wet enough for plants to grow all year.

Tropical zones are home to amazing animals like monkeys, parrots, elephants and tigers.

Why is the Equator so hot?

Here is the clever science. The Earth is shaped like a giant ball, and it leans slightly as it travels around the Sun.

Near the Equator, in the middle, the Sun shines from almost straight above. Its rays hit the ground head-on and are squeezed into a small area, so they heat it up strongly — like pointing a torch straight down at the floor to make a small, bright, warm circle.

Near the poles, at the top and bottom, the Earth curves away. The same sunlight arrives at a slant and spreads out over a much bigger area — like tilting that torch so the light spreads into a big, dim, cool patch. Spread-out sunlight cannot warm the ground much, so the poles stay freezing cold.

That is why the closer a place is to the Equator, the hotter its climate usually is. The Sun is the engine that drives all of Earth's weather and climate.

Living in the right place

Plants and animals are wonderfully suited to the climate where they live:

• A camel has wide feet for walking on hot desert sand and can go a long time without water.
• A polar bear has a thick white coat to stay warm and hidden in the snow.
• A rainforest frog has bright skin and loves the warm, wet air of the tropics.

An animal from one zone would struggle in another — a polar bear would be far too hot in a rainforest! This is why every climate zone has its own special living things, all connected together in food chains and ecosystems.

Try it yourself: the slanting sunshine test

You can see for yourself why direct sunlight is hotter than slanting sunlight, using a torch and some paper.

1. In a dark room, hold a torch straight down, pointing at a piece of paper on the table. Notice the small, bright circle of light. This is like the Sun at the Equator.
2. Now tilt the torch so the light comes in at a slant. The same light now spreads into a big, dim oval. This is like the Sun at the poles.
3. Which patch of light is brighter and more concentrated?

Why this matters: the small, bright circle means lots of warmth squeezed into a tiny space — that is the hot Equator. The big, dim oval means warmth spread thin — that is the cold poles. The Sun's energy has not changed; only the angle has, and that is what makes some parts of Earth hot and others cold.

What is the weather like outside your window right now? And what climate zone do you think you live in?