average speed of a tornado in the United States?

           The average speed of a tornado in the u.s. is about 30 to 70 miles per hour. but the speed or a tornado also depends on what type of tornado it is. the types or tornadoes are classified by damage done which normally means the speed of it, whether its a f0(weak tornado) or a f5(super strong tornado) the tornadoes still have high speeds and are devastating.
         In the us about this time of the year(Spring to beginning of summer) tornadoes happen alot. Just about every time a big storm comes in there's a tornado we've had 3 in the last month in the area i live in. just yesterday an f5 tornado hit a town in Missouri the who town is pretty much destroyed.

         it seem that the tornado average's from the past years til now have been going up and down over the years. they seem to be getting more and more devastating.