What's going to drive our winter weather across Canada this year?

La Niña officially arrived to kick off October, a sign that we could see the event influence our patterns heading into the start of winter.

But another unusual event much closer to home could have a greater impact on our season ahead.

LA NIÑA RETURNS IN TIME FOR WINTER

This winter will begin with a weak La Niña, which is a pattern of colder-than-normal waters around the equator in the eastern Pacific Ocean.

[Winter 2025 Weak La Nina Returns] Winter 2025 Weak La Nina Returns

We’re no stranger to a La Niña winter. In fact, we’ve seen four La Niña events during the past five winters.

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A typical La Niña would alter the jet stream to allow cooler-than-normal condit

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