: With the incredible technology that we have today, why is it still impossible to have 100% accuracy on predicting the weather?
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To predict the behaviour of a system you must know all the variables that influence this system, how this variables change along time, the initial status of these variables and how are they related with each other. Simple systems have few variables and we know how they are related but with the atmosphere it is almost impossible. It is known as a chaotic system, a very little variation in the initial states of the variables that we know can change completely the prediction. As you can see we can measure the weather quite well in a 3-5 day range but further than that is almost completely random. Guessing the next 2 month weather and trying to calculate have the same probabilites to be right (or wrong).
Take a look at this video that explains chaotic systems:
[https://www.youtube.com/watch?v=PDeN3iCtyNY](https://www.youtube.com/watch?v=PDeN3iCtyNY)
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