Weather daily icons showing rainy even if it's sunny

[R4ygen]

Hello, I've noticed that the weather icon for the whole day will show rainy for today, even if the rain is just a small light rain of a single hour duration and all other times of the day is sunny. Or, if the rain was in the morning but now, will be sunny all evening, but the icon still shows rainy for today.

Here're some examples:

This makes sense:

This doesn't make sense:

My advice is:

• Base the icon only on future hours from now, for the rest of the day.
• Change the icon to rainy, foggy, cloudy, etc.. only if at least 25%+ of the day will be rainy, foggy, cloudy, etc...
• Change the icon to rainy, foggy, cloudy, etc.. only if the chance of it is at least 45%+

(these percentages are kinda made up, feel free to choose other values)

[TylerWilliamson]

These icons are set by the weather data provider. In particular, if you are using Open-Meteo, they pick the "worst" hourly weather for the daily icon.

However, I do not particularly like this implementation and I do like the idea of calculating the icon, in theory. However, I am not a meteorologist, and I am not sure what formula should be used to calculate it. I'll keep this issue open while I investigate to allow users to give input

[R4ygen]

Thanks for the feedback!

In particular, if you are using Open-Meteo, they pick the "worst" hourly weather for the daily icon.

I'm on OpenWeatherMap, so I can confirm both services have this behavior.

However, I am not a meteorologist, and I am not sure what formula should be used to calculate it. I'll keep this issue open while I investigate to allow users to give input

Finding an already made algorithm would be nice indeed, maybe by looking at other weather apps and see how they behave. Not sure if it's a meteorology question, more like a UX design question maybe, so it shouldn't be trivial hopefully