Because there are just too many variables, it’s the butterfly effect, even the slightest changes can accumulate to create big differences, you can measure temperature or humidity in one place but it will be different one kilometre away or a hundred or even one metre away and those tiny differences while insignificant on their own become quite big when out together and can bring wildly different results so the best we can do using reasonable resources is get a statistical model and predict what’s is most likely but not 100% accurate
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