In Chicago IL the average wind speed is 10.4 miles per hour. In great falls MT the average wind speed is 13.1 miles per hour. About how much greater is the average wind speed in the great falls?

The average wind speed in Great Falls, MT, is 2.7 miles per hour greater than that in Chicago, IL. This is calculated by subtracting Chicago's average wind speed of 10.4 mph from Great Falls' 13.1 mph. Therefore, Great Falls experiences a noticeably higher average wind speed.