Geocentric Science

The equatorial region receives a lot of insolation throughout the day (it receives a great deal of direct sunlight), and therefore gets extremely warm. As the temperature continues to rise, evaporation will take place (evaportranspiration and evaporation from bodies of water), and the air becomes moisture-rich. During the late afternoon afternoon (early evening), the temperature will decrease increasing the humidity. If the temperature decreases enough, the dew point temperature is reached (the air is fully saturated) and if the temperature cools slightly below its dew point temperature precipitation occurs.

Liquid water has an extremely high specific heat capacity. As a result, once precipitation occurs, a huge amount of energy is released and cooling occurs. (This is one of the reasons the human body sweats.)

In addition, this weather pattern can also be explained by referring to the Planetary Wind and Moisture Belts in the Troposphere diagram. Convection cells form in the atmosphere, and the winds converge at the equator (0º), as well as at 60º North and 60º South. The rising warm, moist air cools to its dew point, resulting in precipitation.