Ionospheric irregularities exert scintillations on electromagnetic waves when the waves pass through them. So they are interesting for satellite signal propagation in the iono- sphere at the magnetic equator and low latitudes. The global navigation satellite system (GNSS) observations recorded at ground-based tracking sites have been a convenient database for inves- tigating ionospheric irregularities. The irregularities over Africa during solar maximum years of 2013–2014 in the 24th solar cycle were investigated in this study by employing the Global Positioning System (GPS), which is a GNSS system. Six African GPS tracking sites of the In- ternational GNSS Service (IGS) network were adopted. First three sites were located at low latitudes close to the geomagnetic equator, in Middle and East Africa (from the Atlantic coast to the Indian coast). The other three were located at middle latitudes and at about the same longitudes as the aforementioned low-latitude sites. Equatorial irregularities were characterized by hourly GPS phase-fluctuation index. This index categorized irregularities into three levels: they are background, moderate, and strong irregularities. The important climatological results have been obtained as followings. First: The equinoctial irregularity occurrence rates over the three low-latitude sites decreased slowly from Middle to East Africa (94%, 89%, 83% and 87%, 73%, 64% for moderate and strong irregularities, respectively). Likewise, the June solstitial rates were also decreased similarly (90%, 88%, 74% and 67%, 58%, 37%). However, the December solstitial rates decreased faster (55%, 24%, 28% and 26%, 10%, 7%). Thus, the equinoctial and June solstitial occurrence rates were also high in East Africa (83% and 64%; 74% and 37%), while the December solstitial one was low (only 28% and 7%). Second: Although moderate and strong irregularities occurred very frequently over the low latitude sites (e.g., 94% and 87%), they over the three middle latitude sites all were nearly at the background level (i.e., nearly 0% and 0%). This indicates the irregularities did indeed come from the equator. Third: Although the equinoctial irregularities were dominant, the June solstitial irregularities also occurred fre- quently and their occurrence rates were comparable to the equinoctial ones, especially in Middle Africa. As for the December solstitial irregularities, they were obviously of minor importance when compared to both the equinoctial and June solstitial ones. The prominent June solstitial rates in Middle Africa may be due to the northward shifted geomagnetic equator (located in the northern hemisphere) and small declination angles.