Hennessey is a small town located in Kingfisher County, Oklahoma. The climate in Hennessey is considered to be hot and humid in the summer months, with temperatures often reaching the high 90s. Winters are mild, with temperatures averaging in the mid-40s. The town's hydrology constituents include the Cimarron River and a number of smaller creeks and streams. Outdoor recreation opportunities in Hennessey include fishing, hunting, hiking, and birdwatching. Visitors can also explore nearby parks and wildlife areas, including the Great Salt Plains State Park and the Gloss Mountains Wildlife Management Area.