Lake Baikal temperature shift: 2025 data shows warming trend above global average

Lake Baikal, recognized as the world's deepest and most voluminous freshwater lake, is now experiencing a warming trend that surpasses the global average for large bodies of water. Data from the Point No. 1 research program indicates that by 2025, the temperature of Baikal's surface water is projected to be about 0.5 degrees Celsius higher than the mean observed in 1,912 large lakes globally. In comparison, these lakes have registered an average temperature 0.31 degrees above their 1995-2020 mean, according to satellite readings, while direct measurements show a 0.7-degree increase over the long-term mean at 38 lakes. This recent shift is notable. In 2022, Baikal's surface temperature was approximately 4 degrees cooler than the global average. By 2023 and 2024, the situation reversed, with Baikal's temperature approximately 2 degrees warmer than similar bodies of water. The 2025 measurements further narrow this gap to about half a degree, reinforcing Baikal's trend towards higher temperatures. Climatologist Pavel Lebedev emphasizes that these figures highlight a critical methodological concern alongside their climatological implications. He argues that reliance solely on satellite data is insufficient for accurately capturing the dynamics in a lake as unique and vast as Baikal. Continuous in-person measurements are essential to providing a clear picture of changes. This concern becomes pronounced in light of the shrinking global network of direct monitoring stations, which has decreased from 38 to 25, thereby introducing substantial uncertainty into predictions regarding ecological shifts.