open-meteo

This is a very confusingly worded. I think what they mean is that the data and code itself is libre/free/open [0] [1] but the API access is essentially rate limited for non-paying customers? [0] https://open-meteo.com/en/licence (CC-BY) [1] https://github.com/open-meteo/open-meteo/blob/main/LICENSE (AGPL)

Not yet, but I am working towards it: https://github.com/open-meteo/open-meteo/issues/206

Currently only the past 2 days are available. To add more historical data is in the backlog [0]. Do you have an application in mind? Which weather variables over which timeframe? [0] https://github.com/open-meteo/open-meteo/issues/27

For now I only offer 2 days of past weather data. Most likely I can store some basic weather variables like temperature, humidity, wind, precipitation and weather code for a couple of weeks. I will keep you request in my backlog: https://github.com/open-meteo/open-meteo/issues/27 Thanks!

Thanks for your suggestions! I will add precipitation probability as soon as I include 14-day ensemble weather models. Deterministic whether models usually do not offer this directly. I also really like the 2 days historical access :) At some point I would like to add more, but the storage requirements skyrocket quickly. Not only in space, but also disk IO to perform in-place updates. For air quality data I want to add first all variables individually. AQI can be calculated afterwards on-the-fly. Some AQI indices require data from the previous hours, but it should work well with 2 days past data. For sure I will directly integrate the European and US AQI. I considered unix-timestamp instead of ISO9601 string timestamps. Working with unix-timestamps is a bit trickier if you also want to use timezones. For the start, i settled with ISO8601