Chance of a gale here, it is already raining hard.
I thought the New Scientist article I posted up in the 'Talk about Jogging' thread summed it all up nicely.
When looking and comparing at rainfall, a simple mean annual value tell you very little.
You have to look at the probability of intensities. Or in English, how likely is it to: not rain, drizzle, light rain, moderate rain, heavy rain, torrential or tropical rain.
In the couple of minutes it has taken me to write this, it has changed to a proper gale with heavy rain.