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A forecast that says, for instance, "there is a 10% chance of rain tomorrow," means that on 10 out of 100 days with weather conditions very similar to the conditions expected tomorrow, at least a trace of train has occurred.
Some will disagree with this answer for various reasons. For the results of research that evaluated how understanding of percentage chance of precipitation varies around the world, see "A 30% Chance of Rain Tomorrow: How Does the Public Understand Probabilistic Weather Forecasts?," available as a PDF file via the URL http://www.mpib-berlin.mpg.de/en/mitarbeiter/gigerenzer/pdfs/RainFinal.pdf .
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Is it 40 percent of the area that will receive rain if there is a 40 percent chance of rain?
No, 40% chance of rain is How Likely it is to rain for that day,or week. Not Area. LOL
Does a thirty percent chance of rain really mean it will rain?
A thirty percent chance is a low probability, so it probably won't rain, but it could.
If there is a 75 percent chance of rain on Monday and a 25 percent chance of rain on Tuesday what is the probability of rain on either Monday or Tuesday?
thirteen sixteenths.
Does 60 percent of rain means its going to rain?
No. A 60% chance of rain means exactly what it sounds like: there is a 60% chance that it will rain. This also means that there is a 40% chance that it will not rain.
Is 80 percent means that it is going to rain?
Not neccessarily, there's a 20% chance it can rain.
