In deserts the weather is very dry, but it is not always hot. Some deserts are cold places because they are situated at high altitudes. A desert is anywhere with less than 25 centimetres of rain per year.

In tropical rainforests it rains nearly every day, and there are no summer or winter seasons. They are located near the Equator where it's hot all the time.

In Antarctica, around the South Pole, temperatures can fall to minus 60 degrees Celsius in winter. The snow rarely melts. The Arctic region at the North Pole is not quite as cold because it is made up of frozen ocean and in the summer the snow melts.

Extreme weather affects people and places. High amounts of rainfall may result in flooding. When it does not rain for a long time you get droughts and crops do not grow. Hurricanes and other violent storms destroy people's homes. But perhaps we should count ourselves lucky we don't live on Saturn. Space watchers have detected a 300-year-old storm there that is so powerful it would flatten a big city.