harmattan
A dry and dusty wind which blows from the Sahara over the Atlantic coast of West Africa in December, January and February, being a hot wind in some areas and a cold wind in others.
Storm-clouds stretched their arms across the sky; from the east, to all appearances, might come a fierce harmattan, or from the south might come the fierce hurricane.
A season which spans the period in which the harmattan wind blows.
Where it comes from
From Twi Akan haramata or a related word (whence also Spanish harmatán). The ultimate origin is supposed by some to be an Arabic word, but which one is uncertain; حَرَام (ḥarām, “accursed thing”) has been suggested.
Adapted from the Wiktionary entry harmattan (CC BY-SA 4.0).