"In the United States, the lowest temperature on record,–79.8°F, was recorded on January 23, 1971, at Prospect Creek Camp, which is located in the Endicott Mountains of Northern Alaska at latitude 66° 48′N, longitude 150° 40′W. The lowest temperature in the contiguous 48 states,–69.7°F, occurred on January 20, 1954, at Rogers Pass, in Lewis and Clark County, Montana. This location is in mountainous and heavily forested terrain, about 0.5 mi east of and 140 ft below the summit of the Continental Divide."
I'm doubtful of -60 at Jackson, but hey, who knows.
Source:
Weatherexplained.com