Wyoming's climate is generally semi-arid and continental (Köppen climate classification 'BSk'), and is drier and windier in comparison to most of the United States with greater temperature extremes. Much of this is due to the topography of the state. Summers in Wyoming are warm with July high temperatures averaging between in most of the state. With increasing elevation, however, this average drops rapidly with locations above averaging around . Summer nights throughout the state are characterized by a rapid cooldown with even the hottest locations averaging in the range at night. In most of the state, most of the precipitation tends to fall in the late spring and early summer. Winters are cold, but are variable with periods of sometimes extreme cold interspersed between generally mild periods, with Chinook winds providing unusually warm temperatures in some locations.