note I don't know if this is climate change but it certainly is freaky.....
http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/08/19/two-to-three-feet-of-hail-crippled-parts-of-mexico-city-sunday/

We've gotten a little bit of hail the last few days but nothing like this. Of course, it's the rainy season here so heavy rains are nothing unusual. A storm hit last night while we were at dinner--I expected to see an ark float by. It's not unusual to have enough water in the street to be able to kayak it. It's on a hill so the water runs off pretty well. Mexico City sits in a bowl surrounded by big mountains and there are no natural rivers to drain the city so when it rains the water just sits there until they can pump it out.

The Aztecs established the original city on a lake (actually a series of interconnect lakes that stretched for many miles) and much of the city floated on huge rafts.
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Mexico