Meteorologists use modern technology to predict the weather all over the world. In ancient times, people could only use the power of observation to tell when seasons changed and what the weather would bring. They could observe the changing patterns of the seasons. This taught them when to plant and when the crops would grow.
People also observed animals and the growing cycles of plants to predict changes in the weather. They could tell when a rainy season was coming and when it would get cold. They learned to prepare themselves in advance for the winter. People used their senses to see and smell changes in the wather. The migration of animals was also a sign of change. Animals sense changes in weather. They change their behavior according to the weather and can sense when a storm is coming. Nature gives signs, and humans have to know how to read them (even today!).