<P> Tornadoes are possible in Minnesota from March--November, but the peak tornado month is June, followed by July, May, and August . Tornadoes are most common in the southern half of the state, which is located on the northern edge of Tornado Alley . Just over a third of tornadoes in Minnesota strike between 4: 00 pm and 6: 00 pm . The state averages 27 tornadoes per year, 99% of which have ratings of F2 or weaker . On average Minnesota has an F5 tornado once every 25 years . Some of the notable Minnesota tornadoes and outbreaks are: </P> <Ul> <Li> August 21, 1883: An F5 tornado struck Rochester, killing 37 . This tornado led to the construction of a new hospital, which eventually evolved into the Mayo Clinic . </Li> <Li> April 14, 1886: A large tornado struck Sauk Rapids, killing 72 . This was Minnesota's deadliest tornado on record . </Li> <Li> June 22, 1919: The second - deadliest tornado in Minnesota history tore through Fergus Falls, killing 59 . </Li> <Li> May 6, 1965: Four F4 tornadoes ripped through the Twin Cities metro area (two of them in Fridley), killing 13 . </Li> <Li> June 16, 1992: Minnesota experienced its second - largest tornado outbreak with 27 recorded twisters . The largest tornado in this family was an F5 that struck Chandler, Minnesota, killing one . This is the most recent F5 tornado to strike the state . </Li> <Li> March 29, 1998: An F4 and an F3 tornado that were part of a larger outbreak tore through the towns of Comfrey and St. Peter . They killed two and caused damage in the millions of dollars in Minnesota's earliest recorded tornado outbreak . </Li> <Li> June 17, 2010: Three EF4 and six EF3 tornadoes were part of 48 twisters that touched down in Minnesota's largest tornado outbreak on record . </Li> </Ul> <Li> August 21, 1883: An F5 tornado struck Rochester, killing 37 . This tornado led to the construction of a new hospital, which eventually evolved into the Mayo Clinic . </Li> <Li> April 14, 1886: A large tornado struck Sauk Rapids, killing 72 . This was Minnesota's deadliest tornado on record . </Li>

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