According to a study done earlier this year, the average temperature for the arctic was -22 degrees fahrenheit (-30 degrees Celsius). Since water freezes at 32 degrees fahrenheit normally, the air temperature would have to be at least that, given no wind and the absence of salt water. Salt actually speeds up thermal reactions, which is why you use salt on your driveway to melt it in the winter. Given that, the air temperature would have to be somewhere above 10 degrees in order to melt the ice.
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