Heatwave affecting Western Europe in the third decade of June 2026

The Yukon Delta, located on the Bering Sea coast of western Alaska, USA, is one of the largest river deltas in North America. Its maze of channels, wetlands, tundra, and lakes provides important habitat for migratory birds, fish, and other Arctic wildlife, while also shaping local transport and subsistence activities.

Sea ice around Svalbard plays an important role in the Arctic environment, influencing marine ecosystems, surface temperatures, and the ocean-atmosphere exchange. According to the latest C3S bulletin, Arctic average sea ice extent ranked as fourth lowest on record for May 2026, with particularly low sea ice around Svalbard.

Show Your Stripes Day, celebrated every year on 21 June, is an initiative to raise awareness of climate change and the need for urgent action. “Climate stripes” are a simple but impactful visual rendering of global warming. Each vertical stripe represents one year’s average temperature at a given location.

Lake Siljan lies in Dalarna, a region in central Sweden which is widely regarded as the country's strongest bastion of traditional Midsummer celebrations, one of the country’s most important seasonal celebrations.

Antarctic sea ice plays an important role in the polar climate system, influencing not only Southern Ocean ecosystems but also global ocean circulation. For this reason, sea ice conditions are closely monitored to better understand their impact.