I'm afraid no inhabitant of Central Europe believes in weather statistics... Besides, there is no such thing as a rainy season and a dry season in these parts of the world.

slightly different question but when are the new wines released in Vienna. We'd like to hit up a few of the wine bars - heurigs? - and am wondering whether they are generally open through the spring and fall or only at specific times. We will go to Vienna either in May or probably mid October.