Boating can be dangerous anytime and anywhere, but Lake Superior can be particularly treacherous.
It has deadly cold water, which, outside sheltered areas, ranges from 54 to 66 degrees during the warmest time of the year, with an average annual temperature of 40 degrees, according to the National Park Service. Hypothermia can lead to exhaustion or unconsciousness in one to two hours in water temperatures ranging from 50 to 60 degrees, according to experts, and death can occur in one to six hours.
Volatile weather patterns can also buffet the Apostle Islands. There can be clear, sunny skies to a torrential downpour and 40 mph winds within 10 minutes, Stickler said.
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