Tornado climatology
The United States averaged 1,274 tornadoes per year in the last decade. April 2011 saw the most tornadoes ever recorded for any month in the US National Weather Service's history, 875; the previous record was 542 in one month. It has more tornadoes yearly than any other country and reports more violent (F4 and F5) tornadoes than anywhere else.
List of United States tornadoes in April 2011
A total of 360 tornadoes touched down in this extremely large tornado outbreak; 359 tornadoes were in the United States and 1 was in Canada. For more details, see List of tornadoes in the 2011 Super Outbreak.