I think that the sentence in italian didn't express that there have been love for a long time, or at least many times. The way it was translated to italian, it seems that this feeling of love just happened once - and therefore it has less importance - not like in french (chaque fois), english (whenever), or br. portuguese (sempre).
Sorry, everybody, but it seems that both the English and French translations are incorrect. It should be "When I loved you, it rained in this city". Please revise your votes accordingly. ali84, you may want to re-set the voting.