1. North Dakota became a state: On June 30, 1889, North Dakota officially became a state, along with South Dakota. This day is celebrated as North Dakota's statehood day.

2. First North Dakota National Park: On June 30, 1947, Roosevelt National Park in North Dakota was officially established as a national park. The park is named after President Theodore Roosevelt, who had a home in the area and was a passionate advocate of conservation.

3. Record high temperature: On June 30, 1936, the city of Steele in North Dakota recorded a temperature of 121°F. This remains the highest temperature ever recorded in the state.

4. A famous musician was born: On June 30, 1917, Lena Horne was born in Brooklyn, New York. Horne was a famous singer, actress, and civil rights activist, and spent much of her later life in North Dakota.

5. A major flood: In June 2011, North Dakota experienced a major flood that caused significant damage in several areas, including Bismarck and Fargo. On June 30, the National Guard was called in to help with evacuation efforts in Minot, where the Souris River had reached record levels.