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The original was posted on /r/explainlikeimfive by /u/inzru on 2023-08-11 19:43:55.

Original Title: ELI5: Why do most online weather forecasts only state the chance of rain as a percantage, without stating the expected rainfall in millimetres? If there’s a 90% chance of rain, it matters a lot whether it will be 0.5 or 5mm