What Is 1985 North American cold wave

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Last updated: April 15, 2026

Quick Answer: The 1985 North American cold wave was a severe winter event in January 1985 that brought record-low temperatures across the U.S. and Canada, with wind chills reaching −60 °F (−51 °C) in some areas. It contributed to at least 16 deaths and caused widespread infrastructure strain, particularly during the coldest week of January 20–26.

Key Facts

Temperatures dropped below −30 °F (−34 °C) in International Falls, Minnesota, on January 21, 1985
Wind chill in the Upper Midwest reached −60 °F (−51 °C), increasing frostbite risk within minutes
At least 16 deaths were directly linked to the cold wave, primarily from hypothermia and carbon monoxide poisoning
The cold wave coincided with a major Arctic air outbreak, the coldest in over 20 years
Over 120 U.S. cities reported record-low daily temperatures on January 21, 1985

Overview

The 1985 North American cold wave was one of the most intense winter events of the late 20th century, affecting much of the United States and Canada during January 1985. Triggered by a massive southward plunge of Arctic air, the cold wave shattered temperature records across multiple states and provinces, with particularly severe impacts in the Midwest and Northeast.

This extreme weather event was notable not only for its intensity but also for its duration, with frigid conditions persisting for over a week. The cold wave disrupted transportation, strained energy systems, and led to school and business closures across a wide swath of North America.

January 20–26, 1985: The coldest period of the cold wave, when most record lows were set across the U.S. and Canada.
International Falls, MN: Recorded −37 °F (−38 °C), earning its nickname 'Icebox of the Nation' during the event.
Chicago, IL: Dropped to −26 °F (−32 °C) on January 20, with wind chill making it feel like −60 °F (−51 °C).
Eastern Canada: Ottawa and Montreal saw temperatures plunge below −30 °C (−22 °F), disrupting daily life.
Energy demand: Surged by over 30% in affected regions, leading to rolling blackouts in some areas.

How It Works

The 1985 cold wave was driven by a breakdown in the polar vortex, allowing a massive surge of Arctic air to move southward into populated regions of North America. This atmospheric phenomenon is typically stabilized by strong jet stream winds, but disruptions can lead to extreme cold outbreaks.

Polar Vortex Disruption: A weakening of the stratospheric polar vortex allowed cold Arctic air to spill southward into mid-latitudes during January 1985.
Jet Stream Pattern: A deep trough formed over central North America, anchoring the cold air mass for over a week.
Arctic Air Mass: Originated in northern Canada and Greenland, bringing continental polar air into the U.S.
Wind Chill Effects: With sustained winds over 20 mph, wind chill values dropped below −60 °F (−51 °C), increasing frostbite risk.
Urban Impact: Cities like Detroit and Cleveland experienced prolonged sub-zero temperatures, straining heating systems.
Duration: The cold wave lasted approximately 7 days, longer than typical Arctic outbreaks, increasing its societal impact.

Comparison at a Glance

The 1985 cold wave ranks among the most severe winter events in modern U.S. history when compared to similar events.

Event	Coldest Temp	Duration	Record Locations	Deaths
1985 Cold Wave	−37 °F (−38 °C)	7 days	120+ U.S. cities	16
1977 Cold Wave	−27 °F (−33 °C)	5 days	90 cities	21
1994 Arctic Outbreak	−35 °F (−37 °C)	6 days	105 cities	12
2014 Polar Vortex	−26 °F (−32 °C)	5 days	110 cities	21
2021 Texas Freeze	−10 °F (−23 °C)	10 days	75 cities	246

While not the longest or deadliest cold event, the 1985 wave stands out for the sheer number of record lows set in a single week. Unlike later events such as the 2021 Texas freeze, which caused catastrophic infrastructure failure, the 1985 cold wave primarily impacted the northern U.S. and Canada, where cold-weather preparedness was more robust. However, its intensity and widespread temperature records make it a benchmark for extreme winter weather.

Why It Matters

Understanding the 1985 North American cold wave helps meteorologists and policymakers prepare for future Arctic outbreaks, especially in an era of climate variability.

Climate Research: The 1985 event is frequently studied to understand polar vortex dynamics and Arctic amplification effects.
Emergency Planning: Cities improved cold-weather response plans after the strain on shelters and utilities in 1985.
Public Health: The fatalities highlighted risks of hypothermia and carbon monoxide poisoning during power outages.
Energy Infrastructure: Led to upgrades in grid resilience in northern states to handle peak winter demand.
Record Keeping: Many of the 1985 temperature records still stand, serving as benchmarks for extreme cold.
Media Coverage: The event received widespread news attention, increasing public awareness of winter weather dangers.

The 1985 cold wave remains a significant reference point in meteorological history, illustrating how extreme weather can simultaneously challenge infrastructure, health systems, and emergency response networks across a continent.