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If you have found a particular issue, please let the group know. Sometimes these are traceable and correctable.

Weather files posted alongside modeling programs will have originated more or less from reputable sources although certainly there might be an error here or there due to faulty processing, missing data, or irregularity in the original source.

A couple of paid services are:

http://weather.whiteboxtechnologies.com/

http://www.weatheranalytics.com/get-weather-data

As far as Africa in particular, I can't say if these sources are better than others, or if the availability in general is going to be good. I can imagine that there might be difficulty with microclimate where the available sources are far apart if your modeled building is located somewhere between.