Wyoming has a continental climate, characterized by moderately warm summers at low elevations, long and cold winters, and generally low amounts of precipitation. Average July temperatures range from about 17°C (about 63°F) in Yellowstone National Park, in the mountainous northwest, to 20°C (68°F) in Cheyenne, in the southeast. January averages are -7°C (19°F) in the national park and -3°C (27°F) in Cheyenne. The basins, which lie in the rain shadow of mountains, are very dry, with an average annual precipitation of about 250 mm (about 10 in) or less; the Great Plains region has an annual average of about 380 mm (about 15 in), and the Black Hills region receives slightly more.
Thunderstorms and hailstorms are relatively frequent in summer. The annual snowfall ranges from about 500 mm (about 20 in) in the Bighorn Basin to well over 5,100 mm (over 200 in) in the higher mountains, where annual precipitation can be 1,140 mm (45 in) or more. A distinctive climate feature is the high and persistent winds of the Wyoming Basin. The growing season in Wyoming diminishes generally from east to west, from more than 120 days in the Plains region to less than 80 days in the mountainous northwest. "Wyoming" © Emmanuel BUCHOT, Encarta, Wikipedia
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