Canada is facing an increased health risk from extreme cold waves, according to a recent study titled Conditional Attribution of Cold Extremes in Canada: The Role of Atmospheric Circulation in a Changing Climate by Y. Liang, published in November 2025 in the journal Environmental Research Letters. The research highlights how specific atmospheric circulation patterns can channel intensely cold polar air into Canadian regions, raising the likelihood of hypothermia among residents, even as global warming continues to push average temperatures upward.
Liang’s team applied a flow analogue method, comparing atmospheric circulation today with historical patterns to evaluate how often and how severely cold extremes occur. Their findings indicate that these extreme cold events are not simply driven by a drop in global average temperature. Rather, shifts in large‑scale atmospheric dynamics — such as the southward movement of polar air masses — are critical in producing sudden, intense cold surges that pose severe risks for human health.
“In a warming climate, we might expect fewer freezing episodes, but our research reveals a more complicated reality,” said Y. Liang, Climate Research Division, Environment and Climate Change Canada, lead author of the study. “Atmospheric circulation plays a pivotal role. These cold extremes can arrive swiftly, and their timing and location are not always intuitive. That makes prediction and preparation more challenging — and more urgent.”
Hypotermia and Frostbite Becomes A Real Threat
The health implications are particularly worrying. Hypothermia becomes a real threat during these extreme cold spells. Vulnerable populations such as children, the elderly, and those with chronic medical conditions are at elevated risk. Liang notes that healthcare facilities in some Canadian provinces have already reported upticks in hypothermia-related admissions during unusually intense cold events, suggesting that these atmospheric patterns are having concrete effects on people’s well‑being.
Beyond hypothermia, frostbite also poses a serious danger. The study emphasizes that extreme cold and sudden temperature drops increase the likelihood of frostbite, especially when people are exposed for prolonged periods or have inadequate protection. “The combination of low temperatures, high wind chill, and prolonged exposure can damage tissues quickly,” Liang explains. “Even brief exposure during a flow-analogue cold event can have lasting consequences.”
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Infrastructure in Extreme Climate
Infrastructure and transport systems are under strain as well. Roads become slick and treacherous, public transit can be disrupted, and the demand for heating and electricity skyrockets. Remote and northern communities are especially vulnerable; sudden cold events can overwhelm their capacity to respond. Liang warns that without proper planning, energy systems and emergency services may be unable to cope with surges in need, putting lives at risk.
Economically, the costs are steep. Outdoor labor sectors — such as construction, agriculture, and transport — are disrupted during extreme cold, reducing productivity and increasing risk. Meanwhile, higher energy consumption for heating drives up costs for households already struggling through long, harsh winters. Liang’s study argues that relying solely on average global temperature trends is inadequate: to protect Canadians effectively, policymakers must integrate atmospheric circulation data into climate risk models.
Early Warning System for Canada’s Extreme Cold Waves
Liang recommends that decision-makers strengthen community preparedness efforts. This includes early-warning systems for cold extremes, the development of emergency warming centers, and targeted public health messaging in at-risk regions. “Our results make clear that predicting cold extremes is not just a meteorological challenge — it’s a social one,” she said. “Communities must be ready, especially those with people who have underlying health risks or limited shelter.”
To put the scale of risk into context, national data on cold-related injuries in Canada show that frostbite is a significant and growing concern. According to Health Canada, between 2011 and 2023 there were 9,425 cold-related hospitalizations, and frostbite injuries (ICD‑10 codes T33–T35) accounted for 60.6% of these cases. health-infobase.canada.ca In Ontario alone, data from 2010 to 2018 revealed 5,311 unique frostbite episodes treated in emergency departments. PubMed
These numbers underscore the real and present danger that extreme cold poses — not only in terms of life-threatening hypothermia but also debilitating frostbite. Liang’s study, therefore, serves as a crucial warning: as the climate warms, Canada cannot ignore the paradox that cold extremes may persist or even intensify. Planning and preparing for these events must become a central component of climate resilience strategies. (Sulung Prasetyo)
