That is difficult to determine, as accurate records are onyl available in the United States, and even those only accurately count tornadoes as far back as the early 1990s. However, based on counts of major tornadoes, a likely contender for the least active tornado year on record is 1910.
Tornadoes occur least often in the winter.
Tornadoes can occur at any time of year but the greatest number occur in spring and early summer.
The number of tornadoes that occur worldwide is not known as most countries do not keep records of their tornadoes. Annually there are at least 1800 tornadoes recorded worldwide, but the number of actual tornadoes is much higher, perhaps several times higher.
That is unknown. Current records indicate at least 1800 on average, but the number is almost certainly higher as many countries do not keep records of their tornadoes.
Michigan averages between 15 and 16 tornadoes per year.
The United States averages about 1200 tornadoes each year. Worldwide the number is less certain.
Yes. Tornadoes can occur at any time of year.
Kansas averages 93 tornadoes per year, thoguh the actual number varies from one year to the next.
Tornadoes can happen at any time of year but occur most frequently in spring an early summer.
Generally, the highest number of tornadoes in the U.S. occur on the Great Plains, so much so that the region is sometimes called Tornado Alley. The region experiences as many as 800 tornadoes per year.
Tornadoes are least like to spawn in very cold or dry climates, where the atmosphere rarely has enough energy to produce the powerful thunderstorms needed for tornadoes.
Yes, tornadoes can occur at any time of year.