Yakutsk, the capital of the Sakha Republic in Russia, is widely recognized as the coldest city in the world. While the term “coldest place” may refer to uninhabited regions or research stations, a city is defined as a permanently inhabited area with established infrastructure and residents. In this context, Yakutsk stands out as the coldest city on Earth where people live year-round.
For those who come from countries with four seasons, winter already represents the coldest period of the year. However, winter conditions in Yakutsk go far beyond typical cold weather. Temperatures regularly fall below −40°C, making daily life a constant challenge that requires adaptation, resilience, and advanced infrastructure.
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Yakutsk Average Temperatures Throughout the Year
The table below shows typical average temperatures in Yakutsk throughout the year, highlighting the extreme seasonal contrasts experienced by residents.
| Month | Season | Average Temperature |
|---|---|---|
| January | Winter | −38°C to −42°C |
| February | Winter | −35°C to −40°C |
| March | Late Winter | −25°C to −30°C |
| April | Spring | −10°C to −5°C |
| May | Spring | 5°C to 10°C |
| June | Summer | 15°C to 20°C |
| July | Summer | 18°C to 22°C |
| August | Summer | 12°C to 18°C |
| September | Autumn | 2°C to 7°C |
| October | Autumn | −10°C to −15°C |
| November | Early Winter | −25°C to −30°C |
| December | Winter | −35°C to −40°C |
Note: Temperatures shown represent typical observed ranges. Actual daily temperatures may vary significantly due to extreme continental climate conditions.
What makes these figures so striking is the annual swing. Between the depths of January and the height of July, the city moves through a temperature range of roughly 60°C. Few inhabited places on Earth experience such a contrast, and it means buildings and heating infrastructure must be engineered for two almost opposite conditions.
Living in the Coldest City in the World
Living in a place with special conditions is also challenging and remarkable. Summer and winter are two extreme seasons already. But in the lowest-temperature city, the sensation is far different.
To live, the human body has to adapt to the environment. The experts and the scientists work hard to create devices to make people comfortable and easier to adapt. Changing the weather and climate is impossible but creating a building with convenient temperature is still possible.
There are some cities as the candidate to win the lowest temperature category. However, Sakha Republic has a city with constant low temperatures with four to five hours of sunlight per day in January. It’s the capital city, Yakutsk, located on the Lena River, was first built as a wooden fort.
Founded in 1632 as a wooden fort, Yakutsk has grown into a modern city with a population of approximately 372,801 people as of 2025. Much of the local economy is supported by the diamond mining industry, and the city’s architecture reflects its unique environment. Wooden houses, apartment blocks, and high-rise buildings coexist, all designed to withstand severe cold.
Those buildings are built above permafrost with steady and frozen soil that never seems to melt. Buildings usually produce heat from electric devices and the heating system. However, it’s not enough to melt the ice, and the inhabitants have to be aware of the cold.
Building on Permafrost
All buildings in Yakutsk are constructed on permafrost, a permanently frozen layer of soil that never fully melts. Structures are elevated above the ground to prevent heat from buildings from thawing the ice, which could destabilize foundations.
Despite the heat generated by electrical devices and heating systems, the ground remains frozen. As a result, residents must constantly remain aware of the extreme cold and the importance of reliable infrastructure.
The engineering behind this is worth understanding. Buildings sit on concrete piles driven deep into the frozen ground, with an open air gap between the ground and the ground floor. That gap is not an architectural quirk. It allows cold air to circulate freely underneath, keeping the permafrost frozen. If warmth from the building were allowed to reach the soil, the ice within it would melt, the ground would lose its structural strength, and the building would begin to sink unevenly. The same principle explains why heating pipes throughout the city run above ground rather than buried, which is one of the most visually distinctive features of Yakutsk.
The Heating System in Yakutsk
The first line of defense against the cold is clothing. From head to toe, people wear fur hats, fur boots, and fur coats. For the ears, they often don’t need earmuffs because the fur hats provide wide coverage. However, proper clothing must be supported by an effective heating system.
Unlike tropical countries where heating systems are not a primary concern, in this city, they are as important as any staple. Heating is extremely vital here. In rural areas, people use wood-burning stoves to maintain a comfortable temperature, lighting the wood two to three times a day. They place brick heating stoves in the center of the house to distribute the heat evenly.
Throughout the city, people rely on coal heating systems. Many administrative buildings depend on coal heating. They place the pipes of the heating system above the ground. In harsh winter, operators must check and maintain the heat more diligently. During these hard times, operators work in shifts without respite. If they miss maintaining the heat even once, someone in the city might be in danger.
This is not an exaggeration. In a district heating system, a prolonged failure at −40°C allows water inside the pipes to freeze, and frozen pipes burst. A single major fault can therefore cut heat to thousands of homes and take days to repair in conditions where working outdoors is itself hazardous. This is why redundancy and constant monitoring matter more in Yakutsk than almost anywhere else on Earth.
Outsiders often wonder about the coal supply that powers the system. The answer is quite fascinating. There is no need to worry about coal because this area has high-quality coal with abundant supply. It has run well for many years to warm the entire city.
Where Modern Heating Technology Fits, and Where It Does Not
It is tempting to assume that modern electric heating technology could replace coal in a city like Yakutsk, but the physics say otherwise, and it is worth being precise about this. An air-source heat pump works by extracting heat from outdoor air. As the outdoor temperature falls, there is progressively less heat available to extract, and the unit’s efficiency declines. Current cold-climate models, including Legom’s air-source heat pumps, are engineered to operate reliably down to around −35°C, which is a considerable achievement and covers the great majority of populated cold regions.
Yakutsk in January sits below that threshold. At −40°C and colder, an air-source heat pump cannot serve as a primary heat source, which is precisely why the city continues to rely on centralized coal district heating rather than distributed electric systems. Being clear about this matters, because the value of a heat pump is real but bounded.
Across the rest of Russia, however, the picture is very different. Moscow, Saint Petersburg, and most Russian cities experience winter lows well within the operating envelope of a modern heat pump, and demand there has been growing steadily. Legom exports air-source heat pumps and thermal actuators to distribution partners in Russia and exhibits at the Russia HVAC and Heating Exhibition in Moscow. The R32 refrigerant used in these units offers a lower global warming potential than older alternatives, supporting a cleaner heating transition in regions where the climate permits it.
For Yakutsk itself, the more realistic modern improvement is not replacing the heat source but distributing heat better inside the building. Hydronic underfloor heating in Russia has grown in popularity for exactly this reason: fed by the existing district heating supply, it spreads warmth evenly across the floor, removes the cold spots that radiators leave behind, and keeps the coldest surface in the room, the floor, comfortable underfoot.
“People sometimes ask whether our heat pumps would work in a place like Yakutsk, and the honest answer is no, not as a primary heat source. We rate our units to −35°C and we stand behind that number, but Yakutsk in January is colder than that, and no manufacturer should pretend otherwise. What does apply there is everything downstream of the heat source. District heating still has to be distributed inside the building, and that is where good manifolds, actuators, and underfloor heating make a real difference. Knowing the limits of your own technology is part of being a serious manufacturer.”
— Maggie Shen, Director of Legom
Conclusion
To sum up, living in the coldest city in the world might sound tough, but as long as the heating system runs well, it will be okay. The combination of traditional coal district heating, careful permafrost engineering, and better heat distribution inside buildings is what allows the citizens of Yakutsk to remain healthy and comfortable despite the extreme cold. For a wider view of the country’s climate and heating, see our article on how cold Russia is, or compare nations in our guide to the coldest country in the world.
Frequently Asked Questions
How cold does Yakutsk actually get?
Yakutsk averages between −38°C and −42°C in January, its coldest month, with December and February not far behind. Record lows have reached far below this. What is remarkable is the annual range: July averages 18°C to 22°C, meaning the city swings through roughly 60°C between summer and winter. This extreme continental climate is caused by its location deep inside the Asian landmass, far from any moderating ocean influence, combined with only four to five hours of daylight during January.
Why are buildings in Yakutsk raised off the ground?
Buildings are elevated on concrete piles with an open air gap beneath them to protect the permafrost. If warmth from a building reached the frozen soil directly, the ice within it would thaw, the ground would lose its structural strength, and the building would sink unevenly and crack. The air gap allows cold air to circulate under the structure, keeping the ground frozen and stable. The same reasoning explains why heating pipes in the city run above ground rather than being buried, which gives Yakutsk its distinctive appearance.
Can heat pumps work in a city as cold as Yakutsk?
Not as a primary heat source. An air-source heat pump extracts warmth from outdoor air, and as temperatures fall there is progressively less heat available to extract. Modern cold-climate units, including Legom’s, are engineered to operate reliably down to around −35°C, which covers the vast majority of cold-climate cities including most of Russia. Yakutsk in midwinter falls below that threshold, which is exactly why the city depends on centralized coal district heating instead. Heat pumps remain an excellent solution across the rest of the country, where winter temperatures stay within their working range.
How do residents keep warm day to day?
The approach is layered. Clothing comes first, with fur hats, fur coats, and fur boots providing coverage that synthetic materials struggle to match at these temperatures. Inside the city, buildings are served by centralized coal district heating delivered through above-ground pipes. In rural areas around Yakutsk, households use wood-burning stoves, typically brick-built and positioned centrally in the home so heat radiates evenly, lit two or three times a day. Reliable infrastructure and constant maintenance underpin all of it, since a heating failure in these conditions becomes dangerous very quickly.
Reviewed by Maggie Shen, Director at Legom, on July 22, 2026. This article on Yakutsk and extreme cold-climate heating was reviewed for technical accuracy, including the operating limits of air-source heat pumps in sub-arctic conditions.