How fast does average rain drops fall? Does size matter?
What about the height of the cloud? Does the altitude of the ground matter?
The terminal velocity of raindrops is somewhere between 5 and 20 mph. All
of the conditions you mentioned can be factors affecting the velocity. For
an excellent discussion on this subject, visit this link:
Wendell Bechtold, meteorologist
Forecaster, National Weather Service
Weather Forecast Office, St. Louis, MO
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Update: June 2012