They say April is the cruelest month, but May’s weather is just as fickle – it’s the wettest month of the year in Louisville. Just look at Kentucky Derby’s soggy history. We built this site as a fun way to track what the weather is doing so you don’t have to lug your raincoat and boots for no reason. As for the money question: Is it going to rain on Derby? We’ll keep you posted. In the meantime, take a look at the last 143 years of Derby weather in the chart below.