Does it rain P% of the time that meteorologists predict P% chance of showers?

Does it rain P% of the time that meteorologists predict P% chance of showers?
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Answer :

There are records of the actual rainfall but I think it would be much harder to find past records of meteorologists predictions. Plus, when and how do you count it? As a case in point, today (Monday) they may say “50% chance of rain on Wednesday” and then the weather patterns change overnight and on Tuesday they say “40% chance of rain on Wednesday”. So then, what is the chance of rain on Wednesday? 50%? 40%? 45%?
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