Wisconsin has a humid continental climate. Winters are long and cold throughout the state. Summers are short and fairly hot, especially in southern Wisconsin. The waters of lakes Superior and Michigan modify the climate of the coastal areas to a noticeable extent. These areas are generally milder in winter and cooler in summer than interior sections of the state.
Average July temperatures range from more than 22°C (72°F) in the southwest to less than 19°C (66°F) in some northern areas. Daytime temperatures are seldom much higher than 32°C (90°F), and cool weather is not unusual. Summer nights are generally cool, and July temperatures have been known to dip to the freezing point in northern areas. January averages fall below freezing throughout Wisconsin.
They range from less than -12°C (less than 10°F) in the interior northern areas to -6°C (22°F) in the southeast, along the Lake Michigan shore. During winter extremely cold weather persists for several weeks at a time. Average annual precipitation ranges from 700 to 800 mm (28 to 32 in). Rainfall is generally heaviest during the spring and summer, and snowfall is generally moderate in the south, but can be quite heavy in the north. Thunderstorms, sometimes accompanied by devastating tornadoes, are common in spring and summer, particularly in the southern part of the state.
The growing season ranges from less than 90 days in some areas of the north to more than 160 days along parts of the Lake Michigan shore. Land situated within about 3 km (about 2 mi) of Lake Superior has an extended frost-free period averaging 114 days. "Wisconsin" © Emmanuel BUCHOT, Encarta, Wikipedia
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