By Jo Nova Warn the bankers, our climate models are not something to invest in say the modelers

A group of top climate modelers have come together to warn bankers that climate models are wonderful but basically useless for predicting things that financial models need — like the trends in the hottest, wettest or windiest weather in any city on Earth. Often the expert models can’t even agree on the sign. Will it get bigger or smaller? It’s that bad.

The raw truth of just how unskilled these models are is laid bare in the graphs. The modeling team chose London, Mumbai, New York and Beijing and picked the nearest 100km x 100km “square” on the map. They ran about 37 models on 3 scenarios and achieved something that looks like a painting done with a jet engine.

The modelers can’t say if the hottest maximums in Beijing will get hotter. Even if the world warms 2 degrees (by random happenstance), Beijing’s hottest-days might actually get cooler. The rainiest days of the year could be more extreme unless they’re less extreme. And the windiest days will definitely be stronger, weaker, or about the same. Get it?

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