There's also the Citizen Weather Observer Program [1]. It's more North America-centric (where the data even gets ingested for use by some weather forecast model

There's also the Citizen Weather Observer Program [1]. It's more North America-centric (where the data even gets ingested for use by some weather forecast models, after various data quality checks), but anyone from anywhere in the world is also free to share their weather data. [1] https://en.wikipedia.org/wiki/Citizen_Weather_Observer_Program https://en.wikipedia.org/wiki/Citizen_Weather_Observer_Progr...