Canada Braces for Unpredictable Winter as Climate Signals Clash

Canada is preparing for one of its most uncertain winters in recent memory, as meteorologists say the combined effects of climate change and a weak La Niña are making long-range predictions unusually difficult.

Climate experts report that the most confident signals appear in the eastern Arctic, where temperatures from December to February are expected to be well above seasonal norms. The warming trend is likely to impact most of Nunavut, areas surrounding Hudson Bay, and northern parts of Quebec and Labrador.

Some small regions in the Yukon, Northwest Territories, and Nova Scotia could experience colder-than-average conditions, while near-normal temperatures are forecast along parts of British Columbia’s coastline, eastern Nova Scotia, and portions of Newfoundland.

However, for the majority of western and central Canada — including B.C., Alberta, Saskatchewan, Manitoba, and significant areas of Ontario, Quebec, and the Atlantic provinces — meteorologists see no clear trend. Experts say the absence of strong signals means the winter “could go in any direction.”

The uncertainty stems from the competing forces of La Niña’s typical cooling effect and the persistent warming influence of climate change. While early-season cold snaps in western Canada are consistent with La Niña patterns, long-term warming continues to dominate, reducing La Niña’s impact and blurring forecast confidence.

Researchers also caution that unusually warm ocean waters this year could help fuel stronger winter storms, particularly those forming in the Pacific and moving across the Prairies toward central Canada.

Precipitation forecasts show above-average snowfall or rainfall for northern and western areas — including Alberta, Saskatchewan, B.C., Yukon, and the Northwest Territories. Confidence remains low for the rest of the country.

At the same time, climate scientists have expanded Canada’s rapid weather attribution system to evaluate extreme precipitation events, from heavy rain and freezing rain to hail and snow. Recent analyses indicate that nearly every major precipitation event recorded since mid-2025 was made more likely by human-induced climate change.

The enhanced system is designed to help Canadians better understand how global warming is influencing day-to-day weather and the severe storms increasingly disrupting communities and infrastructure across the country.