I heard somewhere that the coldest temperature recorded in the state of Ohio was in Cincinnati (-25°F). So that is incorrect.
So, what's the most extreme temperature Ohio has ever experienced? The all-time lowest temperature ever recorded was -39° F, which was recorded in Milligan on February 10, 1899. That's a difference of more than 150 degrees from the all-time highest temperature of 113° F, recorded in Gallipolis on July 21, 1934.