Why do most online weather forecasts only state the chance of rain as a percantage, without stating the expected rainfall in millimetres? If there’s a 90% chance of rain, it matters a lot whether it will be 0.5 or 5mm

Question

Why do most online weather forecasts only state the chance of rain as a percantage, without stating the expected rainfall in millimetres? If there’s a 90% chance of rain, it matters a lot whether it will be 0.5 or 5mm

In: 29

Answer 1

Any time you are talking “most” you have to consider that means “What do *most* consumers of this product want?” For a weather forecast. **Most** consumers of weather forecasts just want to know whether or not it’s going to rain, and about what time. How much is usually of little concern to them. They just want to know if they need rain gear, or if it’s a good day to be outside.

Those who want/need more details, like *how much* it might rain have specialized tools available that try and predict that.