Area: 9,833,520 km2 (3,796,742 sq miles)
Capital City: Washington, D.C.
Population: 325,719,178 (2017 estimate)
Official Languages: English
Boarding Countries: Canada, Mexico
Coastline: 19,924 km (12,380 miles)
Currency: US Dollar (UDS)
Government: Presidential Constitutional Republic
The United States is a huge country, therefore it has a considerable climatic variety. In general, however, it has a continental climate, with cold winters (often frigid) and hot summers (sometimes very hot), more or less continental depending on the latitude and the distance from the sea. There are, however, some exceptions: in the West Coast on the Pacific Ocean, the climate is cool and damp in the north and Mediterranean in the south; in the coast of the Gulf of Mexico the climate is mild in winter and hot and muggy in summer, while in Florida it is almost tropical; the mountainous areas are cold in winter and cool or cold even in summer; and finally the deserts are mild in winter and torrid in summer. Since there are no obstacles to the descent of cold air from Canada, almost all of the country can experience sudden cold waves in winter, but they have different durations depending on area: they last a few days in the south, and lower the temperature a few degrees below freezing (0 °C or 32 °F) in winter, while they are intense in inland areas, in the highlands and in the north-east. The summer heat waves can be intense as well, especially in inland areas. In general, the western half of the country is more arid than the eastern one, with the exception of the north and central coast of the Pacific, which is wet.