The definition of “Indian Summer” is sometimes misconstrued. According to WKBN meteorologist Paul Wetzl, an Indian Summer occurs after a period of cool weather or a fall killing freeze, where temperatures dip below 28 degrees F overnight.
In Northeast Ohio, temperatures fell to 28 degrees F during the third week of October, and now temperatures are warming up to the 60s and 70s, so we are having an Indian Summer.
Via: WKBN > Paul Wetzl’s Weather Blog: Is this a true “Indian Summer”?