Arizona Monsoon Precipitation Probability Chart
If the weather forecaster says we’re going to have a 10% chance of rain, it will probably at least sprinkle.
If she says 20%, it will definitely sprinkle.
If she says 30%, it will rain.
If she says 40%, break out the wipers and umbrellas.
If she says 50%, get ready to be soaked.
If she says 60%, get the boats.
If she says 70%, get IN the boats.
If she says 80%, better expect a big thunderstorm too.
If she says 90%, you might get blown away on top of it all.
And if she says it’s 100% chance of rain with heavy thunderstorms, flooding, and hurricane force gales, and everybody lays out sandbags, and offices close down, and people stay off the roads…
… it might sprinkle.