Best month to go to Barcelona

If you are considering visiting Barcelona for the first time, then I suggest going in winter (from Dec - Mar). The reason is that many of the beautiful buildings are found in tree-lined avenues, such as the Passeig de Gracia. In winter, when these large trees have lost their leaves, one is left with almost full unobstructed views of the facades of buildings. Could be a little more cold, but it's Ok.