|
Aletsch Glacier Records Biggest Single-Year Melt in Switzerland
Recent findings confirm that the Aletsch Glacier suffers its biggest single-year melt on record during 2026. The Aletsch Glacier is Switzerland and Europe’s largest glacier by area and ice volume, and the 2026 melt coincides with low winter snowpack and record summer heatwaves in Switzerland.
Aletsch Glacier Melt in 2026:
| Dimension | Key Details |
|---|---|
| Primary causes | Primary causes comprise an unusually dry winter with minimal snowpack on accumulation zones, and record European summer heatwaves with consecutive temperature records across June, July, and August 2026. |
| Accelerated mass loss | Accelerated mass loss comprises an average glacier thickness fall of 2.5 to 4 meters across Switzerland, and up to 10 meters of ice-thickness loss on specific glacier tongues. |
| Glaciers disappearing entirely | Glaciers that disappear entirely in 2026 comprise Bella Tola (Valais), and Griessfirn (Glarus). |
| National ice-volume loss | Swiss glaciers’ ice-volume loss in 2026 comprises 5.5% of their total remaining ice volume. |
| Relative ranking of national loss years | National ice loss ranking comprises 2026 as the second-worst year after 2022. |
| Cumulative loss | Cumulative Swiss glacier loss over the last 5 years comprises nearly 20% (one-fifth) of total ice volume. |
| Meltwater release | Meltwater released by Swiss glaciers between May and September 2026 comprises approximately 2.2 trillion liters. |
| Meltwater comparison metric | The meltwater volume comparison comprises more than 4 times the annual domestic drinking water consumption of all Swiss households. |
| UNESCO World Heritage location | UNESCO World Heritage status comprises the Aletsch Glacier’s location in the Bernese Alps within the Swiss Alps Jungfrau-Aletsch UNESCO World Heritage Site. |
| European hydrology impact areas | Impact on European hydrology comprises effects on headwaters for key transnational river basins, downstream freshwater supply, inland barge navigation, and hydroelectric output. |
| “Peak Water” concept | “Peak Water” concept comprises a point after which annual runoff permanently drops as the remaining ice reservoir shrinks. |