1. On June 20, 1947, a tornado devastated the town of Woodward, Oklahoma, killing over 100 people and injuring more than 1,000.

2. In 2013, on the same date, the state of Oklahoma experienced a record-breaking heatwave with temperatures reaching 114°F (45.5°C) in Tulsa, making it the hottest June day ever recorded in the city.

3. The June 20, 1926, edition of The Daily Oklahoman reported that the Oklahoma Governor's Conference had just concluded, during which time Governor Martin Trapp proposed a plan to distribute free textbooks to school children throughout the state.

4. In 1983, on June 20, a tornado struck the town of Chickasha, Oklahoma, tearing through homes and businesses and causing extensive damage. Fortunately, there were no fatalities reported.

5. On June 20, 1968, the Muscogee (Creek) Nation ratified a constitution, which set forth a system of government for the tribe and made it one of the first American Indian nations to establish its own written constitution.