Station: Salem, MO. U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. [2021-08-02]. (原始内容存档于2024-05-13).
Station: Salem, MO. U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. [2021-08-02]. (原始内容存档于2024-05-13).