Geneva: Switzerland’s famous glaciers are facing another difficult summer as intense heat across Europe causes their protective snow cover to disappear unusually early. Scientists monitoring the glaciers say the rapid loss of snow has exposed older glacier ice to direct sunlight, raising fears of severe melting during the remaining months of summer.
The situation became particularly worrying at the end of June. Researchers said the Rhone Glacier had already reached what scientists describe as Glacier Loss Day. This is the point in the year when the winter snow covering the glacier has effectively melted away and the glacier begins losing older ice. This year, the date arrived on June 29, making it the second earliest on record. Only the extreme melt year of 2022 reached the same stage earlier.
Scientists say the early loss of snow is the result of a dangerous combination of weak winter snowfall and repeated periods of intense heat. Snow normally protects glacier ice by reflecting sunlight and providing a layer of insulation. When this snow disappears, the darker ice underneath absorbs more heat from the sun and begins melting more quickly.
Matthias Huss, a leading Swiss glacier expert, said one monitoring location on the Rhone Glacier lost about 1.5 metres of ice in only two weeks. The amount of water released from Swiss glaciers during the June heatwave was also enormous. According to estimates, the volume of meltwater was equal to filling an Olympic swimming pool every six seconds for two weeks.
The problem is not limited to one glacier. Monitoring teams across Switzerland have reported a rapid disappearance of winter snow reserves. Scientists are especially concerned because much of the normal summer melting season still lies ahead. With glaciers already exposed, weeks of additional warm weather could cause further heavy losses before temperatures begin to fall.
The crisis in the Swiss Alps is unfolding as large parts of Europe experience unusually high temperatures. Several countries have faced periods of extreme heat, while concerns over drought and water supplies have increased in some areas. Climate experts say the conditions affecting Switzerland are part of a wider pattern of rising temperatures, reduced snow cover and continuing glacier loss across Europe.
Recent European climate assessments have also shown the scale of the problem. Glacier regions across Europe have continued to lose ice, while snow cover has remained well below normal levels in many areas. Scientists warn that repeated years of extreme melting are making it increasingly difficult for glaciers to recover.
The disappearance of Alpine glaciers is not only a concern for tourism and the natural beauty of the mountains. The glaciers act as large stores of frozen water and help supply important European rivers, including the Rhine and the Rhone. During hot and dry periods, glacier meltwater can support river flows and provide water for agriculture, industry and communities.
In the short term, rapid melting can send more water into rivers. However, scientists warn that continued glacier decline will eventually reduce this natural water reserve. As glaciers become smaller, they will have less ice available to melt during future periods of drought and extreme heat.
Switzerland has already suffered major glacier losses in recent years. The extreme summer of 2022 was one of the worst periods ever recorded, and further heavy losses followed. Researchers fear that 2026 could become another serious year if high temperatures continue through July and August.
The final scale of the damage will become clearer when scientists measure the glaciers at the end of the melting season. These measurements will show how much ice Switzerland has lost during 2026 and whether the year comes close to the worst recent records.
For now, scientists say the early disappearance of protective snow is a clear warning sign. The glaciers have entered the most dangerous part of the summer with their natural protection already weakened. What happens during the coming weeks will play an important role in deciding how severe this year’s glacier losses become.