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Wyoming is a state in the western United States. The easternmost section of the state is a region known as the High Plains due to its altitude above sea level, while the majority of the state is dominated by the mountain ranges and rangelands of the Rocky Mountain West. Wyoming is the least populous U.S. state. The capital and the most populous city of Wyoming is Cheyenne. Residents of Wyoming are known as Wyomingites.
Wyoming is bordered on the north by Montana, on the east by South Dakota and Nebraska, on the south by Colorado, on the southwest by Utah, and on the west by Idaho. Wyoming is one of three states bounded only by lines of latitude and longitude, Utah and Colorado are the others. It is the tenth largest state in the United States in total area, containing 97,818 square miles (253,348 km²) and is made up of 23 counties. From the north border to the south border it is 276 miles (444 km); and from the east to the west border is 375 miles (603 km).
The Great Plains meet the Rocky Mountains in Wyoming. The state is a great plateau broken by a number of mountain ranges. In the northwest are the Absaroka, Owl Creek, Gros Ventre, Wind River and the Teton ranges. In the north central are the Big Horn Mountains; in the northeast, the Black Hills; and in the southern region the Laramie, Medicine Bow and Sierra Madre ranges.
Wyoming is an arid state with much of the land receiving less than 10 inches (25 cm) of rainfall per year. Consequently, the land supports few opportunities for farming. Ranching is widespread, especially in areas near the numerous mountain chains. The Snowy Range in the south central part of the state is an extension of the Colorado Rockies in both geology and appearance. The Wind River Range in the west central part of the state is remote and includes Gannett Peak, the highest peak in the state. The Big Horn Mountains in the north central portion are somewhat isolated from the bulk of the Rocky Mountains.
The Teton Range in the northwest extends for 50 miles (80 km) and represents the most impressive section of mountains in the state. It is home to Grand Teton, the second highest peak in Wyoming, and to Grand Teton National Park, which preserves the most scenic section of the Teton range.
Several rivers begin or flow through the state, including the Yellowstone River, Powder River, and the Snake River.
The Continental Divide forks in the south central part of the state. The waters that flow or precipitate into this area, known as the Great Divide Basin, do not flow to any ocean. Instead, because of the overall aridity of Wyoming, they simply sink into the soil or evaporate. Rivers east of the Divide drain into the Missouri River Basin and eventually the Atlantic Ocean. They are the Platte, Wind, Big Horn and the Yellowstone rivers. The Snake River in northwest Wyoming eventually drains into the Columbia River and the Pacific Ocean, as does the Green River through the Colorado River Basin.
The climate in Wyoming weather is cool, dry, and windy in comparison to most of the United States. Much of this is due to the topography of the state. Summers in Wyoming are warm with July high temperatures averaging between 85 °F (29°C) and 95 °F (35°C) in most of the state. With increasing elevation; however, this average drops rapidly with locations above 9,000 feet (2,743 m) averaging around 70 °F (21°C). Summer nights throughout the state are characterised by a rapid cooldown with even the hottest locations averaging in the 50-60 °F (10-14°C) range at night. In most of the state, the late spring and early summer is when most of the precipitation tends to fall. 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. on elevation with lower areas in the Big Horn Basin averaging 5-8 inches (125 - 200 mm) (making the area a true desert. The lower areas in the North and on the eastern plains typically average around 10-12 inches (250-300 mm), making the climate there semi-arid. Some mountain areas do receive a good amount of precipitation, 20 inches (510 mm) or more, much of it as snow, sometimes 200 inches (5 meters) or more annually.
The climate of any area in Wyoming is largely determined by its latitude, altitude and local topography. When put together, these factors have a lot to do with airflow patterns, temperature variations, precipitation and humidity brought in by the weather systems that migrate eastward. In winter, Wyoming is often beneath the jet stream, or north of it, which accounts for its frequent strong winds, blasts of arctic air and precipitation, all the necessary ingredients for great snow conditions at Wyoming's northwestern ski areas. In summer, the jet stream retreats northward to somewhere over Canada, leaving the state's weather mild and pleasant at a time when the majority of Wyoming's visitors choose to arrive. Jackson, located at 6,230 feet (1,899 m) above sea level and surrounded by mountains, can expect a high temperature in July of 80˚ F (26.6° C). The average is more likely to be 65˚ F (18.3° C). The closest National Weather Station (in Riverton on the other side of the Wind River Mountains at 4,955 feet (1,510 m)) reports slightly warmer July weather.
Weather and topography in Wyoming have more contrast than in most other states. Surface elevations range from the summit of Gannett Peak in the Wind River Mountains, at 13,804 feet (4,207 m), to the Belle Fourche River Valley in the state’s northeast corner, at 3,125 feet (952 m). Severe weather is not uncommon in Wyoming, with the state being one of the leading states for hail damage in the United States. The number of thunderstorm days vary across the state with the southeastern plains of the state having the most days of thunderstorm activity. Thunderstorm activity in the state is highest during the late spring and early summer. The southeastern corner of the state is the most vulnerable part of the state to tornado activity. Moving away from that point and westwards, the incidence of tornadoes drops dramatically with the west part of the state showing little vulnerability. Tornadoes, where they occur, tend to be small and brief, unlike some of those which occur a little further east.
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