@pottster2
Hi, First of all, Windy does not show reported rain but only forecast rain.
In the Rain layer, it’s clearly the quantity of rain during 3 hours.
6287B070-52EA-4666-A53C-F9171B140428.jpeg
In Meteogram, it is 3h too, or 1h if you are Premium user.
If you want to know the 24h rainfall forecast, see Rain accumulation.