The monsoon climate beyond the equatorial region between 10◦ and 25◦ and North and South of the equator. The countries are along the coastal regions of southwest India, Sri Lanka, Bangladesh, Myanmar, South western Africa, French Guiana, and northeast and southeastern Brazil.
Seasonality of its precipitation is the hallmark and most well-known characteristic of the monsoon climate. Many think that the term “monsoon” means wet weather, when in fact it describes an atmospheric circulation pattern. Though the annual amount of precipitation is quite similar to that of the rain forest, monsoon precipitation is concentrated into the high-sun season. Maritime equatorial and maritime tropical air masses travel from the ocean on to land during the summer, where they are uplifted by either convection or convergence of air to induce condensation. Locally, Orographic (Relief) uplift is an important mechanism for promoting precipitation. As air travels into the Indian subcontinent, it is uplifted by the Himalayas, causing cloud development and precipitation.
The low-sun season is characterized by a short drought season when high pressure inhibits precipitation formation. In the case of the Asian monsoon, the replacement of the thermal low with the subsidence of the Siberian High suppresses uplift. Air masses that dominate this period are dry given their continental origin or stability. A distinct dry season from October to May, when the temperature are lower, the interior of Asia is a region of high pressure. Wind blow over the land in a north east direction , carrying little or no moisture with them. These cool , dry North East Monsoon winds blows toward areas of low pressure and do not bring rain. A wet season from June to September, when the wind change in direction, the wind blow in the region of low pressure. Winds blow across the equator and blow over the oceans, they are warmer and carry a lot of moisture. They bring alot of rain. Total rainfall can reach 600 mm.