Clarendon Hills-area historical tornado activity is slightly below Illinois state average. It is 50% greater than the overall U.S. average. On 8/28/1990, a category F5 (max. wind speeds 261-318 mph) tornado 20.5 miles away from the Clarendon Hills village center killed 29 people and injured 350 people and caused between $50,000 and $500,000 in ... More @Wikipedia
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