Eugene R Thieszen // Shutterstock Oklahoma - All-time highest temperature: 120° F (Poteau on Aug. 10, 1936) - All-time lowest temperature: -31° F (Nowata on Feb. 10, 2011) - All-time highest 24-hour precipitation: 15.68 inches (Enid on Oct. 11, 1973) - All-time highest 24-...