How safe or unsafe is Nigeria?

[Empty Cruise]

Thunderstorms are frequent in the big rainy season, but given enough fuel not much of a problem. They tend to move pretty fast (20-40 kt), so that type will clear an airport inside 30 min. Sometimes the bastards won't move much, and then you either divert or evaluate if its position relative to approach path, airport and missed approach path is such that an approach may still be attempted.

However - if in any doubt, you're not in doubt ;-) Expect flooded runways if landing right after a shower (so will need your contaminated data pretty often).

ATC of absolutely no assistance in CB avoidance - you just tell them what you are going to do and coordinate with other aircraft. That being said, LOS approach are pretty good nowadays and will manage traffic - up to a point.

Late in the big dry season, your biggest problem as far S as ABV will be dust - and as T/O minima in Nigeria cannot be lower than approach minima, you could easily be caught for 3-4 days in places with just a VOR, eg Kano.