Question

Why convectional rainfall is aalso called as 4 o clock rainfall?

Answer 1

The convectional rain generally occurs every-day in Australia in the coastal regions approximately at 4'o clock in the afternoon. So, it is also known as 4'o  clock rainfall.

Answer 2

Convectional rainfall is also called 4 o 'clock rain: Convectional rainfall is the result of high rate of evaporation. Then condensation takes place and rain falls. At mid day , when the sun is at the highest position, the temperatures rise at the equator. This increases the evaporation rate.