The core of the cold came Monday, Jan. 6, and Tuesday, Jan. 7. Subzero temperatures affected a large swath from Montana to New York and as far south as northern Oklahoma and northern Alabama.
Persistent winds pushed wind chills into life-threatening territory, reaching 40 below to 60 below zero across a large swath of the Midwest. The National Weather Service in Wilmington, Ohio, said the wind chills were the coldest observed in central and southwest Ohio since 1994.
On Tuesday, more than 50 primary weather observation sites (mostly in major cities) recorded record lows for the date.