The probability is 1.
It is always raining - any time of the day or night, any day of the year - somewhere on Earth.
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There is a 70% chance it will not rain tommorrow! There is a 70% chance it will not rain tommorrow!
Certain.
There is insufficient information in the question to properly answer it. You need to specify what range of dates and what the typical climate is like, perhaps by specifying the geographic location that you are interested in. If you want to take this to an extreme, and say for any date and for anywhere on the world, then since it is always raining at least somewhere, then the probability that there will be rain during at least one of three days is 1.
In a family with four children, the probability of having four boys is 1 in 16.
There is an 80% or 0.80 chance that it will not rain on Saturday