The Sahara Desert Gets Snow Occasionally

While the image of a snow-covered desert may seem like a paradox, the Sahara's vast and varied landscape is subject to surprising weather extremes. The key ingredients for snow—freezing temperatures and moisture—can occasionally come together, particularly in the more mountainous regions. The town of Ain Sefra in Algeria, situated in the Atlas Mountains at an elevation of over 1,000 meters, has become a notable location for this rare phenomenon. During the winter months, temperatures in this part of the desert can plummet below freezing, especially during the night. This provides the cold conditions necessary for snow to form.

The moisture required for snowfall is less common in the arid Sahara but is not entirely absent. Weather systems can carry moist air from the Atlantic Ocean or the Mediterranean Sea inland. When these systems meet a strong surge of cold air moving south from Europe, the conditions become ripe for precipitation. As this moist air is forced to rise over the Atlas Mountains, it cools rapidly, causing the water (Review) vapor to condense and fall as snow. This unique combination of geographical features and meteorological events is what leads to the breathtaking sight of snow blanketing the warm-toned sand dunes.

Historically, documented instances of significant snowfall in the Sahara are infrequent, making each occurrence a noteworthy event. Before a flurry of recent snowfalls, one of the most famous events in Ain Sefra was in February 1979. More recently, the town has seen snow in 2016, 2018, and 2021, with the 2018 event leaving behind a significant accumulation of up to 40 cm in some areas. While these events are still considered rare, they serve as a dramatic reminder of the complex and sometimes unexpected weather patterns that can occur even in the world's largest hot desert.