Convectional rains are most common in equatorial regions and tropical monsoon climates.
Convectional rainfall occurs when the sun heats the ground, causing air to rise and cool. As the air rises, it cools and condenses, forming clouds. Eventually, the clouds become so full of moisture that they release rain.
Equatorial regions and tropical monsoon climates are characterized by high temperatures and humidity, which create ideal conditions for convectional rainfall. The warm, moist air rises quickly, forming cumulus clouds that can develop into thunderstorms. These regions also experience a lot of sunshine, which helps to heat the ground and create the conditions for convectional rainfall.
In contrast, polar regions and Mediterranean climates are not as conducive to convectional rainfall because they are generally cooler and drier. Temperate regions may experience convectional rainfall in the summer months when temperatures are warmer, but it is not as common as in equatorial regions and tropical monsoon climates.
In summary, convectional rains are most common in equatorial regions and tropical monsoon climates because these regions have high temperatures, humidity, and abundant sunshine, which create the ideal conditions for convectional rainfall to occur.