"Station: Hancock Houghton CO AP, MI". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). National Oceanic and Atmospheric Administration. Archived from the original on September 16, 2023. Retrieved September 2, 2021.
"Station: Hancock Houghton CO AP, MI". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). National Oceanic and Atmospheric Administration. Archived from the original on September 16, 2023. Retrieved September 2, 2021.