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.
Tornado climatology
Since 1900, deadly tornadoes have occurred in Austria, Belgium, Cyprus, Finland, France, Germany, Italy (such as the F5/T10 of Udine-Treviso on 24 July 1930, which killed 23 people,), Malta, Poland, Ukraine, Portugal (such as the F3/T7 of Castelo Branco on 6 November 1954, which killed 5 and injured 220), Romania, Russia and the United Kingdom. The 1984 Ivanovo–Yaroslavl outbreak, with more than 400 fatalities and 213 injured, was the century's deadliest tornado or outbreak in Europe. It included at least one F5 and one F4. Europe's perhaps deadliest tornado ever (and probably one of the World's deadliest tornadoes) hit Malta in 1551 (or 1556) and killed about 600.