Rare summer cold front brings 30 cm (12 inches) of snow to the Alps
A rare summer cold front swept across the Alps from late July 7 to July 8, 2025, bringing significant snowfall and sub-seasonal temperatures to elevations above 2 300 m (7 500 feet). Up to 30 cm (12 inches) of fresh snow was recorded in the Mont-Blanc massif, with temperatures dropping 5–10°C (9–18°F) below seasonal averages.
Image credit: La Place du Village
A rare cold front moved across the Alps overnight from July 7 to 8, resulting in significant out-of-season snowfall above 2 300 m (7 500 feet). The Mont-Blanc massif recorded up to 30 cm (12 inches) of fresh snow, with similar accumulations observed in other high-elevation areas of the French, Swiss, and Italian Alps.
According to Météo-France and MeteoSwiss, temperatures at altitude dropped rapidly, reaching 5–10°C (9–18°F) below seasonal norms. Maximum temperatures in the lowlands fell to 19–22°C (66–72°F), while values at 1 500 m (4 900 feet) hovered between 10–13°C (50–55°F). The snow line briefly dropped to 2 000 m (6 560 feet), with precipitation falling as rain below and snow above this threshold.
Authorities and mountain guides in the Chamonix and Zermatt regions reported temporary closures and increased avalanche risks on high routes, advising caution for outdoor activities. The sudden snowfall disrupted glacier-ski operations in areas such as Passo Stelvio, Italy, and created unexpected hazards for summer hikers and mountaineers.
Climatologists noted that while snowfall at altitude can occur in any month, the scale and timing of this event were unusual following a prolonged period of warm, stable weather. Weather models attribute the event to a low-pressure system over Scandinavia, which directed a cold, moist northwesterly flow across central Europe.
Forecasts indicate the cold spell will be short-lived, with temperatures expected to return to seasonal values from July 9 onward.
I’m a science journalist and researcher at The Watchers, contributing to the Epicenter edition, where I cover peer-reviewed scientific research and emerging discoveries across Earth and space sciences. With a background in astronomy and a passion for environmental science, I’ve worked in shark and coral conservation in Fiji, conducting reef and shark-behavior research, contributing to mangrove restoration, and earning PADI Open Water and Coral Reef Certifications. I bring a blend of scientific rigor and storytelling to illuminate the discoveries shaping our planet and beyond.
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