In what parts of the world are raindrops commonly formed by the process of coalescence?

Question

Coalescence is basically when droplets in a cloud pick up other droplets, and increase the size of the original droplet, and when the droplet becomes too large for the air to support it, it falls from the cloud. My question is basically where does this process occur?

Answer 1

In the tropics this is usually the sole process of formation because it occurs in warm clouds which mainly occur in the tropics.
In cold clouds, drops initially form through the Bergeron Process, where ice crystals form and grow by deposition from water vapor molecules around them. Once the begin to fall, they melt and become rain. As they fall, they grow by collision-coalescence. This is the most common process in the midlatitdues because most clouds are cold clouds.

Answer 2

In every raincloud on every continent and over every ocean.