Keene is an unincorporated community in McKenzie County, North Dakota in the United States. In this zip code area, the 2000 census found 258 people. This climatic region is typified by large seasonal temperature differences, with warm to hot summers and cold winters. According to the Köppen Climate Classification system, Keene has a humid continent…Keene is an unincorporated community in McKenzie County, North Dakota in the United States. In this zip code area, the 2000 census found 258 people. This climatic region is typified by large seasonal temperature differences, with warm to hot summers and cold winters. According to the Köppen Climate Classification system, Keene has a humid continental climate, abbreviated "Dfb" on climate maps.