Station: Unionville, MO. U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. [2021-07-28]. (原始内容存档于2024-06-11).
Station: Unionville, MO. U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. [2021-07-28]. (原始内容存档于2024-06-11).