ZURICH, SWITZERLAND / RankWire.AI / – In 2026, Swiss glaciers experienced a reduction of 5.5% in their ice volume, marking the second-largest decrease ever recorded. The substantial decline followed a winter characterized by an unusually low snowfall and a summer dominated by extreme heat. Glacier Monitoring Switzerland, also known as GLAMOS, tracked these changes throughout the Swiss Alps. The Swiss Academy of Sciences also confirmed these national findings. Over the past five years, nearly 20% of Switzerland’s glacier mass has vanished.
The winter season from 2025 to 2026 was among Switzerland’s ten least snowy since records began. Persistent hot and dry conditions extended from May through September. During the warm season, the freezing level rose above 4,000 metres on 76 days, a figure more than double the average and a new Swiss record. By September, scientists observed no remaining snow at elevations around 3,500 metres, exposing glacier ice across the high Alpine regions.
During the 2026 assessment, average glacier thickness decreased between 2.5 and 4 metres, with some glacier tongues losing as much as 10 metres of ice. Several major glaciers experienced their greatest melt since the start of measurements, including the Allalin, Clariden, Great Aletsch, and Rhône glaciers. These losses positioned 2026 just behind 2022, which still holds the record for the most severe glacier melt in Switzerland’s documented history.
Decreasing Glacier Sizes and Accelerated Ice Losses in Switzerland
Complete disappearance of smaller Swiss glaciers occurred during the recent monitoring period, including Bella Tola in the canton of Valais and Griessfirn in Glarus. Their vanishing is part of a broader downward trend across Switzerland’s Alpine ice fields. Data reveals that glacier volume has diminished by nearly 20% since 2021, a decline driven by repeated years of low snowfall and intense summer melting across much of the Swiss Alps.
The melting glaciers released significant quantities of water during the dry summer months. Between July and September, the glaciers shed about 2.2 trillion litres of water, exceeding four times Switzerland’s total annual drinking water consumption for households. This meltwater contributed to Alpine river systems and other water sources during a period of widespread drought. The figures illustrate how much glacier ice was incorporated into Switzerland’s water cycle over just three months of 2026.
Impact of Low Snowfall and Summer Temperatures on the 2026 Meltdown
Although the 2026 glacier melt was significant, it remained below the record set in 2022. Snow conditions played a role in this difference, with many glaciers beginning the summer with marginally more snow than in 2022. Additionally, less Saharan dust settled on the snow this year. Cleaner snow reflects more sunlight, whereas dust-darkened surfaces absorb greater solar energy, potentially increasing melting when other factors are similar.
Despite these differences, the 2026 season witnessed extraordinary ice loss across both high-altitude and lower glacier tongues, adding another year of notable decline to Switzerland’s ongoing glacier record. Field surveys, snow assessments, and glacier mass-balance studies documented widespread ice reduction, the disappearance of smaller glaciers, and substantial thinning. The data confirm that 2026 ranks among the most severe glacier melting years recorded in Switzerland.