The frequency of tornadoes varies with the seasons but they can occur at any time of year.
The highest incidence of tornadoes in the U.S. is in April, May, and June. Records for other countries are too incomplete to draw conclusions on seasonal occurrence.
Tornadoes are a natural occurrence. Nobody invented them except, perhaps, God.
Canada.
Tornado Alley.
Tornadoes are not an annual occurrence in New Hampshire. On average it gets about 3 tornadoes every 4 years.
The area that gets the most tornadoes in the U.S. (or in the world for that matter) is called Tornado Alley.
Tornadoes generally form along fronts. Whether or not the area is coastal has no significant impact on occurrence.
Tornadoes generally form along fronts. Whether or not the area is coastal has no significant impact on occurrence.
Tornadoes are a a phenomenon of weather, not geology. Their occurrence has nothing to do with plate boundaries.
Surprisingly, Florida actually has the highest occurrence of tornadoes per square mile. However, these tornadoes are generally weaker than those in Tornado Alley.
Tornadoes are a rare occurrence in New Hampshire, averaging about 3 every 4 years in the state
Tornadoes are not a common occurrence near the equator, however, waterspouts, which occasionally come on land an become tornadoes may still occur. Near the equator such tornadoes probably spin clockwise and counterclockwise in equal numbers.