system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: "30% chance of rain"

When a weather report says that there's a 30% chance of rain, does that mean that they expect it to rain for 30% of that day (so a 30% chance of rain at any given time during the day), or a 30% chance of getting any rain at all during that day (so it might rain for 10 minutes and be dry the rest of the time) or something else?
gpt
From The Weather Channel:

>The 'Chance of Precip' describes the likelihood of precipitation (maybe not even measurable) in your forecast area. The chance is based upon a series of 100 instances of identical weather conditions.

>For example, a 40% Chance of Precip means that precipitation occurred 40 out of 100 days with the same type of conditions expected in your area.

No way to direct link, but you can go to your city's forecast and click on "Chance of Rain."