The coldest countries on Earth are facing significant shifts in their established weather patterns, with annual temperatures in these regions remaining well below freezing. Data from 2025, compiled by organisations including the World Meteorological Organisation (WMO) and NASA’s GISTEMP, indicates that Antarctica averaged -56.7ºC, making it the coldest.
Despite their inherent cold, many of these regions are warming at an accelerated rate. A 2022 study in Nature Communications Earth & Environment found that the Arctic is warming almost four times faster than the global average. This warming is attributed to polar amplification, where melting ice and snow reduce the Earth’s reflectivity, causing darker surfaces to absorb more heat.
This climate instability does not always result in milder winters; instead, it can lead to more erratic cold. Changes in jet streams, which typically keep polar air contained, can cause cold Arctic air to move further south, increasing the frequency of polar vortex events and leading to sudden swings in weather, such as heavier snowfall or delayed freezes.