Climate
Itasca State Park lies in northern Minnesota; a location that can be affected by three major air masses. An Arctic air stream extends south from Canada during the winter months; Pacific air that follows strong west winds move over the area and during the summer month a tropical air stream flows north from the Gulf of Mexico. These various air masses have a strong effect on the climate of the area around Itasca State Park.
The winter climate produces extremely cold temperatures, with an average minimum temperature for Itasca being −4 °F (−20 °C). This cold weather is accompanied with snowfall amounts averaging around 54.6 inches (139 cm) annually. A combination of the Arctic air with heavy snowfall and wind can create severe blizzard conditions in the area.
In the summer, the Pacific and tropical winds from the Gulf create warm to hot temperatures, with the highs during July averaging 78.4 °F (25.8 °C). However a clash of cool, dry polar air from Canada and the moisture from the southern tropical Gulf air can lead to showers and thunderstorms. The average annual rainfall in the Itasca area is 27 inches (69 cm). It has a relatively short growing season, with the first frost usually occurring in late September to early October and the first frost-free days not occurring until mid-May or early June.
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