From Christopher Robbins on Four Corners:
It's December. It's cold. You're using a sleeping bag. You have to wear a sweater when you bike to work in the mornings. This is Africa, what is going on?
Harmattan is going on, when the cool winds from the Desert blow in the cool, dry air, bringing a soft mist of fine red sand. You walk around with a a permatan from that red dust all over your skin, and if you were silly enough to bring any electronics here in the first place, consider them donated to the desert gods.