I spoke to the National US National Weather Service Fairbanks Alaska office this morning to get some details
McGrath tied for 2nd with Kaltag at 45 below.
Some people in McGrath may report even colder temps because when you get away from the river and into pockets of the area surrounded by trees, it can trap in the cold with nothing to let it escape.
There may be slightly colder temps in other locations in Alaska, but at unofficial thermometers or at places that don't have calibrated equipment.
Paul
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