Denison, Iowa is a small, rural community located in Crawford County with a moderate climate. The average temperatures range from the low 20s in January to the mid-80s in July. The area is prone to severe thunderstorms and occasional tornadoes. The community's water supply is primarily sourced from the Boyer River and relies on groundwater reserves. The water quality is generally good, but the city has implemented water treatment measures to address nitrate levels. Denison offers several outdoor recreation opportunities, including a municipal pool, parks, and a golf course. The nearby Crawford County Conservation Board manages over 20 parks and wildlife areas with opportunities for hunting, fishing, hiking, and camping.