A rare phenomenon: snow in Sahara. On Sunday, January 07, 2018, the residents of Aïn Séfra, a small town in Algeria, experienced a rare phenomenon: snow in Sahara, world’s hottest desert. In the video below, published by the National Geographic, snow dusted the desert’s sandy dunes. With temperatures touching 33.8 degrees Fahrenheit (1 °C), this white blanket stayed briefly through the morning before melting away. However, a few residents found the opportunity to enjoy some winter fun.