Each year, about 1,200 tornadoes with wind speeds as high as 300 mph touch down in the United States. Though potentially not as damaging as hurricanes, tornadoes are more frequent. They can cause severe damage over a small area and, particularly before the advent of tornado warnings, many deaths. In the decade, 1965-1974, they were responsible for an average of 141 deaths each year, compared with 57 in the 10 years 1995-2004. The peak of the tornado season is April through June or July.