Up north it could go a bit below that. So, the lower mean temperature hovers around 12 degrees. Hammathan is actually my best season of the year. Its a period when I sleep well and soundly. Its caused by very dry and cold air coming from the Sahara desert that blows all the way down continental Africa. So countries/regions closer to the Sahara have an unfair share of the show 😂😂😂. Before now, places like Jos (the capital city of the State of Plateau in central or north central Nigeria) usually attracts tourists for its cold climate during Hammathan season. Folks around the temperate regions go there to 'winter'. Thanks for asking