Mushers and their dogs in the Iditarod Trail Sled Dog Race face plenty of variables in the Alaska wilderness. An unexpected one this year has been heat that is taking a toll in a sport better suited for temperatures well below zero. 

Jason Mackey said a thermometer hanging from the back of his sled hit 26.67 degrees Celsius at one point this week as he camped alongside the trail while mushers neared the halfway mark of the race. Other racers threw their game plans for the 1,609-kilometer race across Alaska out the window to deal with the heat and messy trail details ⇒

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