The winter of 1978/1979 (often called the “Jahrhundertwinter” or “Schneekatastrophe”) was one of the most severe and memorable cold and snow events in modern German and European history, especially in northern and eastern Germany.

What happened

Around Christmas 1978 the weather was mild (temperatures around +10 °C 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 °C farther north).

When the cold air advanced southward, temperatures plunged 20- 30 °C 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.

Northern Germany (especially Schleswig-Holstein), parts of the then- GDR (e.g., Rügen), Denmark, the Netherlands, Poland, and other areas were hit hardest. The storm front eventually reached southern Germany (including the Lake Constance area) by New Year’s Eve.

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.

Impacts in Germany

• Closed snow cover lasted 67 days in large parts of northern Germany (28 December 1978 to 4 March 1979), comparable only to the post- war “Hungerwinter” of 1946/47.⁠
• Roads, railways, and airports were blocked; dozens to hundreds of villages and islands (e.g., ~80 villages in Schleswig- Holstein, Rügen for about a week) were cut off. Power and telephone lines failed; people and livestock were stranded; helicopters and the Bundeswehr helped with supply and rescue.⁠
• Casualties: at least 17 deaths in West Germany and at least 5 (officially) in the GDR; some later estimates suggest higher numbers in the East. Large numbers of farm animals died. Economic damage exceeded 140 million Deutschmarks in the West alone; the GDR suffered severe industrial and supply disruptions.

Broader European picture

The same weather pattern brought a long, cold, snowy winter across much of northern and central Europe (Denmark, Poland, Netherlands, UK, Ireland, Scandinavia).

Temperatures in parts of Norway fell to around -50 °C. The event is regarded as one of the hard winters of the 20th century in the region, alongside 1928/29, 1962/63, 1984/85, and 1986/87.⁠

In short, the turn of the year 1978/79 marked the abrupt start of an exceptionally snowy and disruptive winter that paralysed northern Germany for weeks and affected large parts of Europe.

The winter of 1978/79 had widespread effects across much of Europe, beyond the severe impacts in Germany (West and East). It initiated a prolonged cold, snowy period for large parts of the continent, with major disruptions from blizzards, extreme cold, freezing rain, power outages, and transport chaos, especially in northern and western Europe.

Key effects by region

• Netherlands and Belgium: One of the colder winters of the 20th century in the Netherlands (average -0.8 °C; Hellmann cold index ~206). Two major snowstorms (late December 1978 and mid- February 1979, the latter among the strongest of the century). Rapid temperature drops, heavy ice glaze, and prolonged snow cover caused widespread disruption.⁠
• Denmark: A multi- day snowstorm from 28 December onward, strongest in the south, with significant snowfall and high winds. Major transport and infrastructure problems.⁠
• United Kingdom and Ireland: Severe snowstorms and blizzards in late December, particularly affecting northern Britain, Scotland, and parts of southern England. Large snowdrifts cut off some areas; Heathrow Airport closed. In Ireland, notable snow depths (e.g., up to 26 cm near Dublin) followed by unusually severe frosts. The continental cold also drove an influx of birds (e.g., smew, harriers, owls) fleeing to Britain.⁠
• France: The cold wave arrived 30- 31 December with snow and abundant freezing rain. (Separately, France experienced its largest power outage to date on 19 December 1978, affecting about three-quarters of the country for hours, though this preceded the main Arctic outbreak.)
• Scandinavia (Norway, Sweden): Extreme cold, with temperatures in parts of Norway dropping to around −50 °C. Contributed to the broader northern European cold wave.⁠
• Poland: Known locally in some accounts as a “Winter of the Century”. Heavy snow (e.g., 70 and more cm in Warsaw and Łódź areas), transport collapse, economic damage (livestock losses, supply failures, industrial shortfalls), and infrastructure problems (including a major gas explosion in Warsaw linked to frost- damaged pipes). The hardships highlighted systemic issues and had political repercussions.⁠
• Poland and nearby areas: Sharp temperature plunge (e.g., from near +10 °C to −18/−20 °C), up to 60 cm of snow in the north, road blockages, power -line failures under ice and snow, and temporary isolation of communities.

Broader continental impacts

The late- December weather pattern (sharp air- mass boundary and polar outbreak) triggered a long, cold, snow- rich winter across northern and central Europe. Persistent snow cover helped sustain further cold waves into February. Common effects included:

• Transport paralysis (roads, rails, airports).
• Power and communication failures from ice- laden lines and snow weight.
• Supply shortages and livestock deaths.
• Economic costs from disrupted industry, agriculture, and infrastructure.
• Some flooding in coastal or thaw- related areas earlier in the period.

Overall, the event is remembered as one of the notable hard winters of the 20th century in Europe (alongside others like 1962/63), with the strongest human and economic impacts concentrated in northern Germany, the Low Countries, Denmark, Poland, and parts of the British Isles.

The rapid 20- 30 °C temperature plunge occurred because a sharp, quasi-stationary air- mass boundary (Luftmassengrenze) finally shifted southward, allowing extremely cold Arctic polar air to flood over regions that had been under mild Atlantic air.

Meteorological setup

Around 28 December 1978, a strong high- pressure system (anticyclone) over Scandinavia and northern Russia held very cold, dry Arctic air (locally under -40 °C, and even colder farther east). At the same time, low pressure over the Rhineland and western Europe fed mild, moist subtropical and Atlantic air northward into central Europe (temperatures often +5 to +15 °C).⁠

These two contrasting air masses met along a sharp frontal boundary that stalled for several days roughly over the Baltic Sea and northern Germany. The temperature contrast across this narrow zone was extreme, sometimes 20 °C or more over short distances (e.g., mild “beer-garden” weather in southern Germany while freezing conditions and heavy snow existed only ~100 km farther north).

Why the sudden drop

• For a few days the boundary held nearly stationary while secondary low- pressure systems tracked eastward along it, producing prolonged heavy precipitation (snow on the cold side, rain or freezing rain on the warm side).
• When the last of these systems passed and the pressure pattern allowed it (around 30- 31 December), the denser cold polar air advanced southward as a cold front and surge.
• Locations that had been in the mild air experienced the front’s passage: the mild air was displaced (often undercut or lifted), and surface temperatures crashed 20- 30 °C within roughly 24 hours (examples include drops of ~28 °C in places such as Hof and Weiden).

In short, the plunge was not gradual cooling but the abrupt replacement of one air mass by a radically different one once the boundary moved. This is a classic (though unusually intense) example of a cold- air outbreak behind a strong frontal system.