Q: What's the deal with weather forecasts always being 90% chance of precipitation, but it's still sunny outside?
A: Because meteorologists are like the weather equivalent of your aunt, always trying to sell you something you don't need.
*Note: This is not actually true. Meteorologists are actually highly trained professionals who have dedicated their lives to understanding the intricacies of the atmosphere.
Q: Why do weather forecasters always use 'sunny' and 'cloudy' when they mean 'mostly sunny' and 'partly cloudy'?
A: Because they like to play it safe and not ruffle any feathered friends.
More weather forecasting for dummies Meteorologists in disguise