Even the United Nations International Year of Glaciers' Preservation has seen further massive melting of glaciers in Switzerland. A winter with little snow was followed by heat waves in June 2025 that saw glaciers nearing the record levels of losses of 2022. Snow reserves from the winter were already depleted in the first half of July, and the ice masses began to melt earlier than had rarely ever been recorded. The cool weather in July provided some relief and prevented an even worse outcome. Nevertheless, almost a further three per cent of the ice volume was lost across Switzerland this year, and this is the fourth greatest shrinkage after the years 2022, 2023 and 2003. 2025 therefore importantly contributed to the decade with the most rapid ice loss. Glaciers all over Switzerland have lost a quarter of their volume since 2015. Over 1,000 small glaciers have already disappeared.
In particular, glaciers from the winter disappeared there up to the summit level. As a consequence, the ice thickness on, for example, the Claridenfirn (Canton of Glarus), the Plaine Morte Glacier (Canton of Bern) and the Silvretta Glacier (Canton of the Grisons) reduced by over two metres. For glaciers in the southern Canton of Valais, such as the Allalin Glacier or Findel Glacier, the loss was less at around one metre.
Too little snow in winter
In the winter of 2024/2025, the combination of less precipitation and the third warmest six months of winter (October to March) since measurements began led to very low snow depths. For example, less fresh snow fell in parts of the northern and central Grisons than ever before. For this reason, around 13 per cent less snow was evident on the glaciers at the end of April when compared to the period from 2010 to 2020. The second warmest June since records began led to rapid melting of
snow right up to the highest altitudes. Following a somewhat cool and damp July, August brought a heatwave with a high zero-degree line recorded in part at over 5,000 metres. In combination, this weather led to above-average temperatures in the summer. Between July and September, a few cold fronts resulted to individual days with fresh snow over 2,500 m above sea level, but this only remained for longer periods in high mountains.
"The continuous diminishing of glaciers also contributes to the destabilising of mountains," says Matthias Huss, Director of GLAMOS. "This can lead to events such as in the Lötschental valley where an avalanche of rock and ice buried the village of Blatten."
The Swiss Commission for Cryosphere observation (SCC) of the Swiss Academy of Sciences (SCNAT) documents changes in the Alpine cryosphere. It coordinates the long-term Swiss monitoring networks created for snow, glaciers (GLAMOS) and permafrost (PERMOS). The Swiss Commission for Cryosphere observation (SCC) therefore represents those institutions that look after national monitoring networks, such as the Swiss Federal Institute for Forest, Snow and Landscape Research WSL, the Institute for Snow and Avalanche Research SLF, the Swiss Federal Office for Meteorology and Climatology (MeteoSchweiz), the Swiss Federal Institute of Technology in Zurich (ETH Zurich), the Universities of Zurich, Fribourg and Lausanne and the University of Applied Sciences and Arts of Southern Switzerland (SUPSI), or who contribute financially to long-term safeguarding, such as the Swiss Federal Office for the Environment (FOEN), the Swiss Federal Office for Meteorology and Climatology (MeteoSwiss), in the context of the Swiss Global Climate Observing System (GCOS), the Swiss Academy of Sciences (SCNAT) and the Swiss Federal Office of Topography (swisstopo).
Further information
SCNAT – network of knowledge for the benefit of society The Swiss Academy of Sciences (SCNAT) and its network of 35 000 experts works at regional,
national and international level for the future of science and society. It strengthens the awareness for the sciences as a central pillar of cultural and economic development. The breadth of its support makes it a representative partner for politics. The SCNAT links the sciences, provides expertise, promotes the dialogue between science and society, identifies and evaluates scientific developments and lays the foundation for the next generation of natural scientists. It is part of the
association of the Swiss Academies of Arts and Sciences.
ETH Zurich - The programme Glacier Monitoring in Switzerland (GLAMOS) aims to conduct a long-term study of glacier changes in the Swiss Alps. The service is maintained by ETH Zurich - the Swiss Federal Institute of Technology in Zurich, Switzerland, and involves the Department of Geosciences of the University of Fribourg, as well as the Department of Geography of the University of Zurich. The monitoring is coordinated by the Cryospheric Commission of the Swiss Academy of Sciences (CC/SCNAT) and receives financial support from the Federal Office for the Environment FOEN, MeteoSwiss within the framework of GCOS Switzerland, and the Swiss Academy of Sciences (SCNAT). Additional support is provided by the Federal Office of Topography swisstopo.
