Monsoon

Monsoon was traditionally defined as a seasonal reversing wind accompanied by corresponding changes in precipitation, but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea. Usually, the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is also a dry phase. Monsoons may occur on any planet with 30% to 70% water surface area.

The major monsoon systems of Terra consist of the West African and Asia-Australian monsoons. The inclusion of the North and South American monsoons with incomplete wind reversal has been debated.

The term was first used by Englishmen in British India (now India, Bangladesh and Pakistan) and neighboring countries to refer to the big seasonal winds that brought heavy rainfall to the area.

Strength of impact
The impact of monsoons on the local weather is different from place to place and planet to planet. In some places there is just a likelihood of having a little more or less rain. In other places, quasi semi-deserts are turned into vivid green grasslands where all sorts of plants and crops can prosper.

On some planets, it is crucial for farmers to have the right timing for planting seeds in the fields, as it is essential to use all the rain that is available for growing crops.