In this work, the seasonal performance of different grid-connected photovoltaic technologies installed both in the warm climate of Nicosia, Cyprus, and in the moderate climate of Stuttgart, Germany, was evaluated. The technologies presented include mono-crystalline-silicon, multi-crystalline-silicon and thin-film amorphous-silicon, cadmium-telluride and copper-indium gallium-diselenide technologies. The crystalline-silicon technologies exhibited maximum performance ratio (PR) peaks during the winter and minimum peaks during the warmer summer seasons in Nicosia. This signifies that the performance of these technologies installed in the warm climate is strongly dependent on temperature. The identical type crystalline-silicon technologies in Stuttgart exhibited a similar behaviour as in Nicosia with the exception of rapid decreases in performance due to snow in the winter. In contrast, the amorphous-silicon thin-film technologies exhibited a different seasonal performance compared with the remaining installed technologies, as their operating PR was higher during the summer and autumn months and lower during the winter.