Like a shower in a dodgy hotel, Riga's temperatures swing from one extreme to the other. As I write it's twenty degrees outside and the tree downstairs has exploded into blossom overnight. We haven't had a drop of rain for two weeks, daylight stretches long into the evening, and the sky remains an unadulterated shade of Coventry City blue. "It's something unusual," a student told me. Whatever it is, I'm not about to start complaining.