{"id":478162,"date":"2026-10-11T10:42:23","date_gmt":"2026-10-11T17:42:23","guid":{"rendered":"https:\/\/climatescience.press\/?p=478162"},"modified":"2026-10-11T10:42:25","modified_gmt":"2026-10-11T17:42:25","slug":"when-europes-thermometers-plunged-30-degrees-in-a-day-the-1978-79-air-mass-boundary-that-triggered-a-century-winter","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=478162","title":{"rendered":"When Europe\u2019s Thermometers Plunged 30 Degrees in a Day: The 1978\/79 Air-Mass Boundary That Triggered a Century Winter"},"content":{"rendered":"\n
\"A
AI generated by Grok<\/figcaption><\/figure>\n\n\n\n

The winter of 1978\/1979 (often called the \u201cJahrhundertwinter\u201d or \u201cSchneekatastrophe\u201d) was one of the most severe and memorable cold and snow events in modern German and European history, especially in northern and eastern Germany.<\/strong><\/p>\n\n\n\n

What happened<\/strong><\/p>\n\n\n\n

Around Christmas 1978 the weather was mild (temperatures around +10 \u00b0C in parts of Germany). On 28-30 December a sharp air- mass boundary formed over the Baltic Sea and northern Germany, separating mild, moist Atlantic air in the south from Arctic polar air (temperatures locally under -40 \u00b0C farther north).<\/p>\n\n\n\n

When the cold air advanced southward, temperatures plunged 20- 30 \u00b0C within about 24 hours in many places. This triggered intense snowfall, freezing rain and glaze ice, and strong northeasterly winds that created metre- high (sometimes 5- 7 m) snow drifts.<\/strong><\/p>\n\n\n\n

Northern Germany<\/strong> (especially Schleswig-Holstein), parts of the then- GDR<\/strong> (e.g., R\u00fcgen), Denmark<\/strong>, the Netherlands, Poland,<\/strong> and other areas were hit hardest. The storm front eventually reached southern Germany (including the Lake Constance area)<\/strong> by New Year\u2019s Eve.<\/p>\n\n\n\n

A second major snowstorm struck northern Germany around 13- 18 February 1979, adding further heavy snow (locally 60- 80 cm or more) on top of the existing cover.<\/p>\n\n\n\n

Impacts in Germany<\/strong><\/h3>\n\n\n\n