The Lowest Temperature Extremes
The lowest temperature on record in the United States, ?79.8F, was observed at Prospect Creek Camp in the Endicott Mountains of northern Alaska (latitude 6648'N, longitude 15040'W) on Jan. 23, 1971. The lowest ever recorded in the conterminous 48 states, ?69.7F, occurred at Rogers Pass, in Lewis and Clark County, Mont., on Jan. 20, 1954. Rogers Pass is in mountainous and heavily forested terrain about one half of a mile east of and 140 ft below the summit of the Continental Divide.
The lowest annual normal (1941?1970 mean) temperature in the United States is 9.3F for Barrow, Alaska, which lies on the Arctic coast. Barrow also has the coolest summers (June?August) with a normal temperature of 36.4F. The lowest winter (December?February) normal temperature, is ?15.7F for Barter Island on the Arctic coast of northeast Alaska.
In the 48 conterminous states, Mt. Washington, N.H. (elevation 6,262 ft), has the lowest annual normal temperature, 26.9F, and the lowest normal summer temperature, 46.8F. A few stations in the northeast United States and in the upper Rocky Mountains have normal annual temperatures in the 30s; summer normal temperatures at these stations are in the low 50s. Winter normal temperatures are lowest in northeast North Dakota, 5.6F for Langdon Experiment Farm, and in northwest Minnesota, 5.3F for Hallock.