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Weather and Climate in USA
Due to the immense size and spread of topology in the US the climate is incredibly varied. If there is a "general" climate then it is temperate, but it is also tropical in Florida and Hawaii, arctic in Alaska, arid in the Great Basin of the southwest and semi-arid in the Great Plains to the west of the Mississippi River.
The temperature range runs between the extremes of 57 degrees C during the summer months in California's Death Valley to -62 degrees C in Alaska, with every other shade in between.
The northern states are the coldest, with bitter, freezing winters - especially in the plains, Midwest and Northeast. Low temperatures in January and February in the Northwest are occasionally tempered by warm chinook winds from the eastern slopes of the Rocky Mountains.
In contrast, the southern states are known as the Sunbelt, where it rarely drops below freezing.
Hot summers are the norm throughout the US, except in New England, Oregon and Washington state, all of which are rainier and less predictable than the rest of the country.
Temperate states are concentrated in the Pacific Northwest, while humidity is characteristic of the south, east coast and Midwest (smog levels rise accordingly and can make visiting some cities uncomfortable for those with respiratory problems), and heatwaves common in the Southwest.
Spring and autumn (fall) conditions are generally mild, warm and sunny - but also wet in some areas, particularly the Pacific Northwest.
Tornado season arrives in the Midwest between April and June, and hurricanes are common in early summer along the southern East Coast and Gulf of Mexico coast - TV and radio will broadcast warnings for both, but the chances of encountering one on a short visit are remote.