Deserts Get Freezing Cold at Night — And the Reason Is Beautifully Simple

From scorching afternoons to sub-zero midnights in the same 24 hours.

The Sahara can hit 40 degrees Celsius in the afternoon and then plunge toward freezing that very night — a temperature swing that would shock most cities.

The culprit is what deserts lack: humidity. Water vapor acts like a blanket, trapping heat near the ground after dark.

Dry desert air has almost no blanket, so the day's heat radiates straight up into space the moment the sun sets.

Sand makes it worse — it heats fast but stores heat poorly, giving back its warmth within hours. Desert survival guides warn about the cold as seriously as the heat.