If we're concerned about killer pennies from the top of the Empire State Building, how much more scary are little water bombs from thousands of feet in the sky?
No need to fear...physics is here!!!
Since raindrops are relatively small in volume, the reach a small terminal velocity quickly. An explanation follows:
When raindrops fall, they are met with air resistance. Air resistance is proportional to surface area, so small and big raindrops experience the same phenomenon. The air continues to resist the raindrop until air resistance reaches the same value as the gravitational force. This moment is when the raindrop reaches its "terminal velocity". It can't go any faster because it's no longer accelerating.
And since rain drops have little mass, they won't have a very large velocity!!
Good thing there's air resistance between the clouds and the ground!
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