Average climate in Olivet, South Dakota Based on data reported by over 4,000 weather stations Tornado activity: Olivet-area historical tornado activity is above South Dakota state average. It is 77% greater than the overall U.S. average. On 6/7/1965, a category F4 (max. wind speeds 207-260 mph) tornado 23.0 miles away from the Olivet town center killed one person and caused …