From Environment Canada January 13:

Extreme Cold Warning in effect for:

• Kirkland Lake – Englehart
• Temiskaming Shores – Temagami

A period of very cold wind chills is expected.

What:
Wind chill values near minus 40.

When:
Tonight into Friday morning. Similar conditions are expected for many areas Friday night into Saturday morning as well.

Discussion:
Bitterly cold arctic air will begin to flood across the area tonight. Minimum temperatures near or below minus 30 combined with moderate winds will bring wind chill values near minus 40.

Extreme cold puts everyone at risk.

Watch for cold related symptoms: shortness of breath, chest pain, muscle pain and weakness, numbness and colour change in fingers and toes.

Dress warmly. Dress in layers that you can remove if you get too warm. The outer layer should be wind resistant.

Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill.

If it’s too cold for you to stay outside, it’s too cold for your pet to stay outside.