Rain drops can fall at various rates depending on the environmental circumstances.
Not including wind-driven rain, raindrops can fall between 7 and 18 miles per hour (3 and 8 meters per second) in still air.
The range in speed also depends on the the size of the raindrop that is falling to the surface.
Air friction breaks up raindrops when they exceed 18 miles per hour.
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- Berks Chad Blimline/69 News