Cold snap hits Midwest and Northeast

Commuters make their way to work in sub-zero temperatures in Chicago.

A pedestrian walks along a partially frozen Chicago River in sub-zero temperatures on in Chicago.

Commuters from Peaks Island arrive in Portland, Maine, on Friday. The temperature hit a low of minus-2 degrees, with a wind chill of minus-25. Low temperatures and high winds have put the Northeastern U.S. in a deep freeze.

Theo Bradeen, 5, reacts to the cold as he disembarks from a ferry after a ride from his home on Peaks Island to Portland, Maine, on Friday morning.

A man rides his bicycle in Des Plaines, Ill. Dangerously cold temperatures gripped the Upper Midwest in advance of a storm that’s expected to bring several inches of snow in coming days.

Morning commuters bundle up Thursday in Chicago.

Commuters, bundled for warmth, wait for a train at an L station in Chicago on Thursday morning.

Tiara Medlock, a park keeper with the Minneapolis Parks and Recreation maintenance department, sprays water to form an ice skating rink as temperatures dipped below zero on Thursday, in Minneapolis.