With an extreme wind chill warning in effect for Toronto, here's a brief explanation of how the wind doesn't affect the temperature outside yet makes you feel colder at the same time.

The wind chill is expected to make it feel like -35 to -40 degrees Celsius on Monday night and Tuesday morning.

Environment Canada is saying exposed skin may freeze in less than 5 minutes.

The wind chill is expected to slowly ease up starting on Tuesday afternoon.

Why does it
feel so cold?

When it's cold out, we lose body heat. This heat is absorbed by the air that surrounds us.

On calm days, the heat lost from our bodies forms a thin layer of warm air along the surface of our bodies. This warm layer of air acts as an insulator against the colder air around us.

As the wind starts to blow, our layer of warm insulating air gets swept away and our skin is exposed directly to the cold air. Any new heat we give off is carried away with the wind.

The more wind there is, the quicker we lose heat.

Wind does not change the temperature of the air. If a thermometer is placed outside, it will read the same temperature regardless of whether it's a windy day or a calm day.

It simply "feels" colder because the heat that we give off is immediately blown away.