Yea, it's that time of the year in Nigeria where cold can highly be experienced and the leaves turns brown and looks very dry. I just like the harmathan weather maybe because it comes once in a year and one just have to relish it then.
I have never experienced itching during the harmathan season which boils down to individual differences,I think I notuced my itches on the skin when I bathe rain water which I have stopped using it to bath. So for you, you should really find out the root cause of the itches, do you stay bare body which the body might react to the weather then you cover up or you avoid getting out so early I think that's even the harmathan weather is very high. But if it becoming very serious after protecting your body then see a doctor.