Overview
- The Alps averaged 0.7–0.8 °C above the 1991–2020 baseline, marking a fourth consecutive warmer-than-average summer half-year.
- Switzerland’s Payerne logged a June freezing-level record at 5,125 meters, while long-term data show a 400–500 meter rise since 1871–1900.
- A cool May gave way to extreme June heat, a lull from mid-July to early August, then renewed warmth by mid-August.
- High Alpine stations recorded about 70–80% fewer June frost days, while summer days ≥25 °C rose by 25–30% at 500–1,000 meters and nearly doubled at 1,000–1,500 meters.
- June was broadly dry with a record-low eight precipitation days at Zugspitze, whereas July saw frequent rain including a 25-day record in Zell am See, and agencies warn the rising freezing line threatens water supply, tourism and ecosystems.