Help me understand OpenWeatherMap rain data

[erkexzcx (Erikas)]

So I am using this integration: OpenWeatherMap - Home Assistant (free plan, Mode: hourly, language: en)

It clearly says this:

rain - Rain volume for the last hour, mm.

However, since I’ve worked a lot with time series data, this does not make any sense to me. This is definitely not Rain volume for the last hour:

So long story short - it seems that data is returning rain interval every 5 minutes. Sudden drop in rain volume seems like it’s showing not of the past hour, but of the past 5 minutes?

I’ve found several threads on this forum regarding topics, like how to get rain volume of past day, but it seems I am the only one with this strange data representation. Sudden falls in volume does not correlate with hourly rain volume.

How does this data work?

[brooksben11 (Ben)]

It’s essentially a rolling total from the last hour; here’s a discussion about it:

Rain Sensor tracking

Hello, i try to track daily precipitation for our garden irrigation using OpenWeatherMap and add it up in a variety of ways. I have tried three different ways and also three different results. Can someone please help me with what is the most useful and accurate way? Here are my different ways of tracking precipitation. Utility Meter utility_meter: regen_heute: source: sensor.openweathermap_rain name: Regen heute cycle: daily History Stats - platform: statistics n…

I don’t use that integration, but I agree, it seems like a rather useless sensor (and poorly labeled and documented).