Hold onto your hats, folks, because Ontario's weather forecast is predicting some seriously cold weather today.

So cold, in fact, that the temperatures in Fort Severn, Ontario, today are frostier than the South Pole in Antarctica.

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-45 C  Fort Severn temperature with wind chill 

Temperatures in Ontario's most northern community of Fort Severn are -32 C on Tuesday, feeling closer to -45 C.

Environment Canada has issued an extreme cold alert for the area, warning that frostbite can develop within minutes on exposed skin.

In Antarctica, which is known as the coldest place on Earth, temperatures will hover at around -16 C on Tuesday in the South Pole region, according to Time And Date.

The weather in Fort Severn is hardly any warmer than parts of Nunavut, which are getting extreme -55 C wind chills today.

Temperatures are set to take a dive all over Ontario this week. In Toronto, Wednesday will feel like -12 C and some snowfall is also expected.

Ready or not, it seems that winter is fully upon us.