Hmmm, that could take some time, I'd have to download some historical weather data from somewhere, then match it to the days I've ridden that I've logged over the last year or so. Still, it's no reason to envy someone. The secret to being able to ride in the rain is to just do it -- that is all really. If you stop and think about it before going out, you'll come up with all sorts of reasons not to go. If you just go out there and do it, you'll realise that it isn't so bad (or in our climate, that it's actually an improvement). Once you get totally soaking wet, you'll wonder why you ever allowed yourself to miss out in the past.