That time Montana hit 70 below ... and maybe colder

Snow had been falling almost continuously for a week, and it was very cold. The temperature had only risen to minus 18 degrees. Finally, late in the day, the snow and wind stopped, skies cleared rapidly, and as the sun set the temperature plummeted. Early the next morning, on Jan. 20, 1954, the Montana and continental 48 states' record cold temperature of minus 70 degrees was observed at a mining camp near the Continental Divide a short distance from Rogers Pass near Helena. The reading was observed by one of the National Weather Service's cooperative observers.

The Rogers Pass weather station...