"Little change is expected in this weather pattern," the weather alert says.
A separate warning for Hall Beach, Nunavut, has since been lifted.
In Iqaluit, several schools and daycares were closed due to the extreme cold. The city pulled its sewage and water trucks off the road, and many found their cars wouldn't start.
One person tried an experiment to see how quickly a tray of ice cubes would freeze outdoors.
The verdict? About 30 minutes.
Paige Nicholls in Iqaluit shared her video of tossing a cup of boiling water in the air at a wind chill of -67 C.
Another Iqaluit resident expressed his own shock at the cold posting this selfie.
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