The clever answer is because it must get very cold at night. But why does somewhere as hot by day as the Sahara, get freezing cold at night? Strange as it seems, the two are connected.
There are no clouds over the Sahara. Therefore there is nothing to get in the way of the fierce sunlight that streams down on the desert between dawn and dusk. Temperatures can rocket to an all-time world record of 58 in the hade. Once the sun sets, the reverse happens. Since there is no cloud cover, the blazing heat of the day soon disappears because there is nothing to keep it close to ground level. Once all that hot air has gone, cold air replaces it. The temperature drops like a stone and sometimes frost forms on the ground before sunrise the next morning.
Picture Credit : Google
