This from Steve Redick:

Took this job in Thursday afternoon, temps were still below zero after record setting cold the previous day. CFD was sending a 3rd engine to all working fires to help overcome the many frozen hydrants encountered. In this case it looked to me like the two closest hydrants were in good working order. They were just a few minutes away from going defensive when I arrived. The tower ladder was positioned late in the fire after moving the first-due truck and second engine who was hooked to a hydrant. Members took a beating from the severe cold.
 
All the images can be seen here:
heavy smoke and flames from Chicago bungalow fire

Steve Redick photo

heavy smoke and flames from Chicago bungalow fire

Steve Redick photo

heavy smoke from Chicago bungalow fire

Steve Redick photo

heavy smoke from Chicago bungalow fire

Steve Redick photo

heavy smoke from Chicago bungalow fire

Steve Redick photo

heavy smoke from Chicago bungalow fire

Steve Redick photo

heavy smoke and flames from Chicago bungalow fire

Steve Redick photo

Firefighters with hose line at winter fire

Steve Redick photo

fire engine hooked to hydrant

Steve Redick photo