Yellowstone National Park is the most famous and the first U.S. national park. It' s located on the territory of three states: Wyoming, Idaho and Montana. Yellowstone occupies the territory of 3.470 square miles (nearly 9,900 km2) and is mostly located in northwestern part of Wyoming. Yellowstone is famous for its geysers and geothermic springs and it's also populated by various kinds of wildlife typical for American West: grizzly, wolves, bison, elk and other species. Yellowstone is the biggest virgin ecosystem, which remains on the planet today in intact state.
             Climate in Yellowstone is continental, which is explained by remote location from the Pacific coast. Summer in Yellowstone is short and mild. Temperatures at daytime rarely exceed 90F and range between 70-80 degrees F; nights are cool with temperatures falling below 40F quite often. Winter is long and cold with temperatures that rarely rise above freezing.
             The highest records for Yellowstone are the following: 98 degrees F was registered at Lamar Ranger Station in 1936; 103 degrees F was registered at Gardiner (northern park's border) in 1960. The lowest minimums are: -66 degrees F at old Riverside Ranger Station, Tower Fall (-52 degrees F), Lake Yellowstone (-56 degrees F), Lamar Ranger Station (-57 degrees F), and Mammoth (which recorded a mild -40 degrees F!) all registered in 1933. (from www.yellowstone.net)
             Depending upon the height the amount of perceptions ranges from 11 inches (Gardiner, Montana) to 38 inches (Bechler River, southwest corner of the park) that includes both melted snow and rainwater. Greater amounts of perceptions occur in higher mountains and highest amount may reach 70 inches point (Pitchstone Plateau- central part of the park). Snow season starts in late October and usually snow stays until late March or early April in most of park locations: "The average duration of snowcover is about 213 days for elevations up to 7,000 f...