eli5 Why can data models predict the future climate but not the weather?

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Why can data models predict the future climate but not the weather?
Why are weather forecasts often wrong but modelling of the future climate highly accurate? I would presume a more complex system over a longer period would be harder to predict.

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Because complex systems regress towards a median, in accordance with a model’s predictions, especially over long intervals, whereas short-term predictions are subject to greater volatility. In other words, it’s much easier to say that 1,000 cars will go down the road, than it is to say that car X will take the next off-ramp.

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